One thing I love about these videos, is they can explain the entire concepts using normal language and not sounding like he's talking done to us. It's awesome. Thank you guys!
6:09 Very true. A bad air to fuel ratio from the pilot adjustment screw will cause issues at any throttle. My idle was fine, my mid range was fine, but my engine would bog at full throttle. I leaned out my my pilot screw and fixed the problem.
well done Steve, I've seen many many videos to understand how it works in a carburetor, the logic and the use of each part. Some were good some were less, but none were as complete and clear as your video. Your team prepared it well, and you explained it as well. My mechanic takes care of my ATV and I only hunt, but I had to understand the hows and whys, and this video DID IT . thanks.
Couple things I've run into recently trying to fix the unfixable 2007 YZ450f lean bog/popping/hard starting..... - 1, make sure valve clearance is within spec. -2, someone had replaced the accelerator pump linkage with some shiny piece, long story short it was not the oem black plastic piece you do the "oring mod" to, so it was too short, accelerator pump did not work. Ordered a new kit, put it on, works fine ever since. Also, wont run without choke, check pilot jet/passage. fuel leak at the inlet, fuel inlet o-rings
Thank you for this excellent information. What you have to say is very important to me. Why blend it with music? I need to hear and learn from every word you have to say. I am not board by this great video and don't need to be entertained.
Excellent vid, I think you touched on exact problem with the accelerator pump. Klx450r runs good everywhere except from idle if you twist the throttle quickly it dies (caused me to fall and being trapped under the bike for an hour boot went between peg and shifter,scary had to call a friend)anyway is the an adjustable accelerator pump offered for this FCR-MX-40 Keihin? Thanks for the video,I am not near as scared,getting it out of the bike is a pain but I must fix this problem any advice is much appreciated.James
First off awesome video very informative. I replaced the carburetor on my Kawaskai Bayou 220 but I'm not getting any fuel flowing into it. I'm stuck on what to do if someone could please help me troubleshoot that would be great. Thanks
You need to check the fuel valve on your fuel tank to see if its clogged. some valves you can rebuild some you cant. but if you pull the fuel supply line off the carburetor and the fuel valve turned on and no fuel flows then that is the issue.
This video helped solidify my understanding of the circuit functions. I was struggling with other videos and diagrams and this video helped but it all together into a concise understanding. Thanks man! I'ma check out the site
Yeah, honestly grateful for this video. It was to the point, very clear, well explained. You just helped me solve 2 different problems on 2 different a.t.v's and I actually learned a lot. Thanks Steve and Rocky Mountain A.T.V
I have a Honda VTX 1300 ques: Will the extended fuel/air Tusk adjust screw work in this application? Ques: Are there carb kits available for the VTX 1300R that contain the Tusk adjusting tool/part? How do I order? George Tucson
Hello Steve, amazing video and great detail. I have 1 question for you though. Have you heard about rejetting pilot jets to be richer for bikes that operate 7000' and above before? Apparently the idea is that natural loss of vacuum on an engine due to high elevations can cause harder starting conditions. A richer pilot jet to help compensate for the lack of vacuum to help aid in a richer condition and adjusting the main jet accordingly to elevation.
You are correct and incorrect. Yes you loose air volume as you get higher in elevation which will both cause a richer condition, but the lose of air volume will effect it. The very reason that the pilot screw/fuel screw/air mixture screw or whatever you want to call it is there for adjustment along with the idle screw. Barometric pressure, and humidity also effect it causing a lean or rich condition. If you were to look at it on a chart, the lower elevation you the changes in jet size are less dramatic in running conditions than it would be at higher elevation because of less air. You can over rich or lean one circuit and try to compensate for the lack of correct adjustment of another circuit to a certain degree. But its not accurate and your engine will never run the best it can without adjusting everything properly.
you got it backwards. higher elevation is less air. so less fuel at higher elevation. see? for what it's worth i've seen the tendency for some folks to think that at higher altitude you need to add fuel and i can't understand why some people think this.
Hi; I have a Vulcan 500cc 1994 with twin carbs, I have a problem of overflown petrol,I had changed the needle valves and cleaned afew time,it worked but in a few months came back leaking baddly. I know the seats of the valves must be modified but I do not where,who does this kind of work. Where I live they do not do it. Have you heard about these problems,how did you solved if you did. Many thanks
18:27 on the top side of this carburetor, there is a plastic tube where you can put a hose on to. But i couldnt find anything on the internet about it. Could you explain to me where this one is for. I thougt that it is connected to the airfilter box. But what to do with those if there isnt a filterbox anymore? If i close them the motor stops running. But if i open them all up it does nt run properly. Hope you can help me out🙏
Liked your video. I have a KTM 450 EXC, with a Keihin FCR-MX carb and the bike won't start with the E-start until it's warmed up a bit and then I usually need to give It just the tiniest bit of throttle. When cold, it starts easily with the kick start, but again, it needs a tiny bit of throttle. Once warm, the bike seems to run correctly and be responsive. I've also had the carb apart a couple of times and can't find anything that looks wrong (everything looks clean, including the pilot jet). I got the Tusk fuel screw and did some adjusting of the fuel mix and idle but it didn't fix my starting issue. It would be great if I could get a couple ideas on what to try next.
stvnmoto, your suggestion was exactly correct. I happened to adjust the valves a couple of weeks ago just hoping it would help and I noticed that one of the intake valves had no clearance. After putting everything back together it started easily with the e-start and no throttle. My subsequent rides were great. Thanks!
While I appreciate this video I wish you would do a video on each carburettor. I just want to focus on the one that applies to my rm250 dirt bike. The specific parts of the carburettor that would be on my bike
I have a 98 Kawasaki bayou 400 it’s having carburetor issues it won’t idle it’s coughing and popping and gas is pouring out the overflow tube but it’s a weird carburetor. It has a primer pump and it has vacuum up to it. I’m not a mechanic do you have any suggestions, what the problem may be thank you
Would really love your opinion brother!!! I just had to redo a build I bought off someone who did it wrong by a long shot not dissing the guy but it was bad anyway I had to take off my carb an I left it upside down for about a month an half while I fixed an waited on parts to come in now when I hooked it all back together my carb is leaking gas, do you know what’s the problem brother lmk please
You mentioned the pilot jet and pilot jet screw working together but you did talk about the pilot jet at all. Can you do a video about adjusting the pilot jet with rich idle conditions
If you are running too rich and have already maxed out your adjustment screw, you need to get a smaller pilot jet to reduce fuel flow even more. Vise versa. If you have already backed your adjustemt screw all the way off, and are still running lean, then you need to get a bigger pilot jet to let more fuel in.
I just rebuilt the carburetor on my atv and it was running super rich. Black spark plug, wouldn't run well after it warmed up, and would bog at full throttle. I had to fully close my pilot adjustment screw. Luckily mine works when fully screwed in so I don't have to replace the pilot jet.
I recently started working for an old guy i thought he knew what he was doing. It bogs down anywhere above 1/4 throttle he keeps having me drill the pilot jet bigger. Its about double the spec and it now runs well up to 1/3 but is still bad above that. I need to adust the needle up as int the nedle is higher right?
A lot of info! I'm wondering how to adjust the throttle return spring on 1992 big bear 350? It has been sitting for a few years and the return spring is very tight.
I have a question, why does my dirt bike keep fouling plugs? When I pull the plug, it looks all black and its fuel soaked after just a few minutes of riding.
Just had same condition on 200 Yamaha. Mine would not get past idle with throttle unless on choke. (Completely clear pilot circuit) my fix was going 1 size up on pilot jet. Make sure your new Chinese carb has the same jets. It may have smaller as they are usually geared towards 125cc or less machines. Good luck let us know your fix!🤞👍
I have two different atvs both only run with the full choke on , and run very fast , remove choke and the engine dies , I have replaced carbs and still same issues any ideas thanks
Check the Hot Start lever adjustment. But for the most part your bike needs to be tuned to you elevation and riding conditions by a good mechanic. The other issue that might be going on is your intake valve clearance adjustment is tight causing the intake valves to not seal correctly causing compression to push back into the carburetor that will not allow the fuel and air to be sucking into the combustion chamber for internal combustion to happen.
I have a 4 stroke atv 2000 Kodiak with an aftermarket carburetor when I go full throttle the the engine stutters. Will that be the wrong jet size? Thank you
Could be. Sounds like the main jet might be too big. You can verify by trying to rev with the choke on, stays the same or worse=smaller main, better=bigger main. Then with choke off and air box lid off, rev it again, better=smaller main, worse=bigger main. This is assuming you've checked all the basics (fresh fuel, clean air filter etc.). For reference, our QA Parts carbs that fit your ATV come with a 120 main and a 45 pilot. If you can't get the carb you have ironed out, I'd try the QA Parts carb and be done with it. -Charles
Thank you for explaining all this. Majorly helped! I did have a question. What is the electrical wires that go into my carburetor? 2000 Kawasaki prairie 300 4X4
I have a 150cc 2018 BENNCHE 4 wheeler that setup for like 6 months and I replaced the battery and also had to replace the fuel filter because it was leaking but anyways my 4 wheeler is hard to start and when it does start it bogs down and dies on acceleration and then I noticed there was gas in my oil so is that my float valve
Hi Steve. I'm your new subscriber from KSA. I got small bike the Honda TMX 155. My plug reading was fine so far having a light tan color which means i got a desired mixture. My issue is that, i can't start my bike with a single kick after overnight parking. It takes 3 - 5 kicks to start w/o choke. And sometimes, takes more kicks if I choked it. Around 8 - 10 kicks if parked over a week. Some owner's and mechanics of this bike said that it is normal for several kicks but i'm not convinced. The average morning temperature in my place was 30 "C. Can you give me some hints to check as I want a single kick every cold start?
Hi Jeaven. It can be normal to kick it a bunch of times, especially if its cold. If it were mine I would adjust the low speed fuel screw and turn it out 1/4-1/2 turn to richen up that circuit. There might be a tamper proof plug installed in the way of the screw that may need to be drilled out so you can adjust it, but that's the solution to your issue.
If I uncork my ttr125le 2019 pull out my air vent and drill two one inch holes do I have to replace pilot from stock 15 to 17.5 pilot. Still stock pipe untouched.
I'm not sure you can call that uncorked. If you are wanting more air flow you can do that and yes you most likely need to go a bigger size in pilot jet. First I would adjust for elevation in your jetting, that might make all the difference in running conditions that you are originally seeking for.
I got a question, every time I type in this engine number, SC39E 2101372 I dont get no results. Could you be able to tell me the size of the motor, its a honda valkyrie, but it is not the flat 6 motor, please and thank you.
Was wondering if you can help me with my carburetor problem. Have a 98 yamaha big bear 350 4x4. Someone totally demolished the carb. All jets, pilot screws were cross threaded and ruined the carb. I got a new one, cleaned it from top to bottom and the only way it will idle is with the mixture screw all the way out to where it's almost falling out. I can get it to Rev up only if I slowly feather the throttle. If I punch it, it immediately boggs and dies. Sometimes it's fine on half choke. I've put smaller and larger main jets and the only thing that changes is full and half choke work properly. Still have to have the mixture screw all the way out and it boggs on quick throttle. I'm at wits end trying to figure this out. Ove cleaned this carb probably 10-15 times. Can anyone help? Thank you
Somebody please help me. I had to change the carb on a 2019 Chinese Apollo 250 with a nearly identical unit. It idles fine, but it backfires and cuts out when accelerating. The plug shows that it's running lean. I'm thinking of putting a better carb, Mikuni, in there but it's so hard to get in and out I want to make sure it's properly jetted. I'm at 4500' Will the Mikuni also need to have a bigger main jet and a raised needle?
We have carburetor repair kits for your ATV that you can check out here: www.rockymountainatvmc.com/parts/atv-fuel-and-air-intake-systems?v=2006-suzuki-eiger-400-4x4
as far as I know, it is used when you start the bike. at that point you need only fuel to get through and so you "close" the air stream. after the engine has started, you let again the air mixed with the fuel. I hope I'm getting that right...:)
recently i replaced the old carburator on my 89 big bear 350 with a ruijie one that is supposed to be for that year among others, it was much harder to start as soon as it was installed and now that we have some snow down and needed to plow the driveway the bike started moved 15-20 feet, died when we went to shift to reverse and now we cant get it to start at all
As I was looking at the schematic for the 2001 Honda 400EX carburetor I see a jet that nobody speaks about. Everybody talks about the choke the float bowl the pilot Jets the main Jets the needle and then settings but nobody speaks of number 38 in the schematic for the 400EX I'm pretty sure it's the same carb as the 300EX maybe the 450 number 38 in the schematic JET, SLOW AIR (#110) what's that about?
I just put a new carburetor on my warrior 350 it’s running way to high n will not stop I adjusted everything I can what can be the problem??? Please help
Which way do I bend the float needle to shut of more fuel. I have a Honda rancher that I think is getting too much in the bowl. Exhaust smells like fuel and crankcase getting fuel
You'll want to bend the tang up towards the needle, which will in turn allow your float level to be set lower. Unfortunately, we don't have a video on setting float level but there are some great videos on TH-cam showing the process.
Backfiring can have a few causes but if you've isolated it to timing you can try advancing it and see if that helps. Also check your fuel pump and filter are both working correctly.
@@rmatvmc yes it is on the opposite side of the throttle thank you! I have trouble getting the right ratio on my scooter.. its 4stroke and have only one mixture screw, how do i know if its working properly?
@@rmatvmc This is a bike with only 2000 miles. The idle was 1000 rpm. The headlight would blink at 1000 and would not start electrically. The battery would go dead so i turned it up to 1300 so the headlight stays bright. I think the problem is fixed but if in happens again i will replace the battery. Thanks
I’m having a problem with a raptor 2001 660r one of my customers bring me a carburetor which after install it’s leaking fuel on the air filter side of the carb are two holes looks like little brass bushings only one of them in one of the carbs is leaking somebody here have an idea what are those holes for or how to fix the problem?
I have yet to find a video where someone simplifies where the damn fuel line input is and the outlet 😣 wtf can someone help? I’ve got 2006 Yamaha Kodiak 400
![ลองสุ่มไอโฟน 990 โกงมั้ย? [ โกงมั้ยครับ ep.101 ] | DOM](http://i.ytimg.com/vi/bfsWe0j492k/mqdefault.jpg)
One thing I love about these videos, is they can explain the entire concepts using normal language and not sounding like he's talking done to us. It's awesome. Thank you guys!
Glad you got something out of this video and we appreciate the feedback.
Thanks for watching!
@@rmatvmc hi I have a 2002 trx400ex can i put a 36mm cr500 carb on it..will it run??...plz respond
@@jayvlogs5544 It might run, but the carburetor is far to big for the accurate fuel/air ratio that the engine needs.
6:09 Very true. A bad air to fuel ratio from the pilot adjustment screw will cause issues at any throttle. My idle was fine, my mid range was fine, but my engine would bog at full throttle. I leaned out my my pilot screw and fixed the problem.
well done Steve, I've seen many many videos to understand how it works in a carburetor, the logic and the use of each part. Some were good some were less, but none were as complete and clear as your video. Your team prepared it well, and you explained it as well. My mechanic takes care of my ATV and I only hunt, but I had to understand the hows and whys, and this video DID IT . thanks.
Thanks for taking the time to share this. Very useful information and the presenter Steve did a GREAT job explaining it all very clearly.
I learned more about carburetors in this 20 min video than I have in my 40 years on this planet.
That's what we like to hear!!!!!!!
I would have appreciated it if you had stuck to one type of Carburetter per video therefore not causing any confusion
Great video....loved how you explained all aspects of the carburetor.
Couple things I've run into recently trying to fix the unfixable 2007 YZ450f lean bog/popping/hard starting..... - 1, make sure valve clearance is within spec. -2, someone had replaced the accelerator pump linkage with some shiny piece, long story short it was not the oem black plastic piece you do the "oring mod" to, so it was too short, accelerator pump did not work. Ordered a new kit, put it on, works fine ever since.
Also, wont run without choke, check pilot jet/passage.
fuel leak at the inlet, fuel inlet o-rings
Thank you for this excellent information. What you have to say is very important to me. Why blend it with music? I need to hear and learn from every word you have to say. I am not board by this great video and don't need to be entertained.
Excellent vid, I think you touched on exact problem with the accelerator pump.
Klx450r runs good everywhere except from idle if you twist the throttle quickly it dies (caused me to fall and being trapped under the bike for an hour boot went between peg and shifter,scary had to call a friend)anyway is the an adjustable accelerator pump offered for this FCR-MX-40 Keihin?
Thanks for the video,I am not near as scared,getting it out of the bike is a pain but I must fix this problem any advice is much appreciated.James
the accelerator pump is adjustable through the leak jet among other details as well
First off awesome video very informative. I replaced the carburetor on my Kawaskai Bayou 220 but I'm not getting any fuel flowing into it. I'm stuck on what to do if someone could please help me troubleshoot that would be great. Thanks
You need to check the fuel valve on your fuel tank to see if its clogged. some valves you can rebuild some you cant. but if you pull the fuel supply line off the carburetor and the fuel valve turned on and no fuel flows then that is the issue.
Liked your presentation but can you give us a comparison between Round versus Flat slide carbs (like Lectron) and the Yoshimura "jet in needle" carbs?
This video helped solidify my understanding of the circuit functions. I was struggling with other videos and diagrams and this video helped but it all together into a concise understanding. Thanks man! I'ma check out the site
Yeah, honestly grateful for this video. It was to the point, very clear, well explained. You just helped me solve 2 different problems on 2 different a.t.v's and I actually learned a lot. Thanks Steve and Rocky Mountain A.T.V
Best video on carburetors I have seen and I have looked at a lot.
Thank you for a great review and summarizing the carburetor. Mine is in need of a rebuild, so thanks.
Thanks! Can you do series on 36-38mm Keihin Carbs.
Great instructional video, thx!
Dude really good video. I don't see how this thing went viral
I have a Honda VTX 1300 ques:
Will the extended fuel/air Tusk adjust screw work in this application?
Ques:
Are there carb kits available for the VTX 1300R that contain the Tusk adjusting tool/part?
How do I order?
George
Tucson
Hello Steve, amazing video and great detail. I have 1 question for you though. Have you heard about rejetting pilot jets to be richer for bikes that operate 7000' and above before? Apparently the idea is that natural loss of vacuum on an engine due to high elevations can cause harder starting conditions. A richer pilot jet to help compensate for the lack of vacuum to help aid in a richer condition and adjusting the main jet accordingly to elevation.
You are correct and incorrect. Yes you loose air volume as you get higher in elevation which will both cause a richer condition, but the lose of air volume will effect it. The very reason that the pilot screw/fuel screw/air mixture screw or whatever you want to call it is there for adjustment along with the idle screw. Barometric pressure, and humidity also effect it causing a lean or rich condition. If you were to look at it on a chart, the lower elevation you the changes in jet size are less dramatic in running conditions than it would be at higher elevation because of less air. You can over rich or lean one circuit and try to compensate for the lack of correct adjustment of another circuit to a certain degree. But its not accurate and your engine will never run the best it can without adjusting everything properly.
you got it backwards. higher elevation is less air. so less fuel at higher elevation. see?
for what it's worth i've seen the tendency for some folks to think that at higher altitude you need to add fuel and i can't understand why some people think this.
You should make a video on best carburetor accessories
That's a good idea. Thanks for the suggestion!
This guy says measure funny. Meayysure. But awsome video, very in depth and informative
It's a Utah thing lol
Thanks so much for this informational video
My husqvarna fc350 revs high when the choke is in, do you think that has to do with the jets?
Great informative video guys. Can’t wait to put this new knowledge to the test in figuring out why my Raptor 350 breaks ups upon acceleration 👍🏻
I really appreciate this well done video. Thank you!
Steve your such a badass ,and you remind me of my good friends keep up the killer instructional vids thanks ,49th State Racing
Hi; I have a Vulcan 500cc 1994 with twin carbs, I have a problem of
overflown petrol,I had changed the needle valves and cleaned afew
time,it worked but in a few months came back leaking baddly. I know the
seats of the valves must be modified but I do not where,who does this
kind of work. Where I live they do not do it. Have you heard about these
problems,how did you solved if you did. Many thanks
Big help thank u , TRX350 Honda , carb. Leaking out overflow. 😊
No problem 👍Glad we could help!
Amazing video. Thank you very much. I'm learning a lot with you guys!
18:27 on the top side of this carburetor, there is a plastic tube where you can put a hose on to. But i couldnt find anything on the internet about it. Could you explain to me where this one is for. I thougt that it is connected to the airfilter box. But what to do with those if there isnt a filterbox anymore? If i close them the motor stops running. But if i open them all up it does nt run properly. Hope you can help me out🙏
Is it bad idea to replace cv carb to a slide one for a chopper 450cc? hard to find a cheap cv carb... and what are the cons?
What about snowmobiles? Mikuni slide carbs are the best on sleds.
Trying to get a dirtbike. They said grass got in to the carburetior from the air breather. Will it still run good?
If anything is in the carburetor it will most likely not run very well. You will want to do a thorough cleaning of the carburetor.
@@rmatvmc will that require taking the whole thing apart and putting it back together?
Great video! Explains carbs very well. Thanks!
"cv carburetor is the most common"
its the first time i ever see one in my life.
You need to ride more bikes, son
@@postmortemspasm sorry if an old fart like me cant afford the new fangled technology.
Liked your video. I have a KTM 450 EXC, with a Keihin FCR-MX carb and the bike won't start with the E-start until it's warmed up a bit and then I usually need to give It just the tiniest bit of throttle. When cold, it starts easily with the kick start, but again, it needs a tiny bit of throttle. Once warm, the bike seems to run correctly and be responsive. I've also had the carb apart a couple of times and can't find anything that looks wrong (everything looks clean, including the pilot jet). I got the Tusk fuel screw and did some adjusting of the fuel mix and idle but it didn't fix my starting issue.
It would be great if I could get a couple ideas on what to try next.
Check your valve clearance. If your intake valves are tight with no clearance than that is your problem.
stvnmoto, your suggestion was exactly correct. I happened to adjust the valves a couple of weeks ago just hoping it would help and I noticed that one of the intake valves had no clearance. After putting everything back together it started easily with the e-start and no throttle. My subsequent rides were great. Thanks!
While I appreciate this video I wish you would do a video on each carburettor. I just want to focus on the one that applies to my rm250 dirt bike. The specific parts of the carburettor that would be on my bike
I have a 98 Kawasaki bayou 400 it’s having carburetor issues it won’t idle it’s coughing and popping and gas is pouring out the overflow tube but it’s a weird carburetor. It has a primer pump and it has vacuum up to it. I’m not a mechanic do you have any suggestions, what the problem may be thank you
Awesome vid and edits and filming
great video
I am looking for a two-stroke carburetor do you guys sell them for a Polaris 250
Do you guys sell two-stroke carburetors for quads I have a 250 Polaris looking for a carburetor for it
Would really love your opinion brother!!! I just had to redo a build I bought off someone who did it wrong by a long shot not dissing the guy but it was bad anyway I had to take off my carb an I left it upside down for about a month an half while I fixed an waited on parts to come in now when I hooked it all back together my carb is leaking gas, do you know what’s the problem brother lmk please
You mentioned the pilot jet and pilot jet screw working together but you did talk about the pilot jet at all. Can you do a video about adjusting the pilot jet with rich idle conditions
If you are running too rich and have already maxed out your adjustment screw, you need to get a smaller pilot jet to reduce fuel flow even more. Vise versa. If you have already backed your adjustemt screw all the way off, and are still running lean, then you need to get a bigger pilot jet to let more fuel in.
I just rebuilt the carburetor on my atv and it was running super rich. Black spark plug, wouldn't run well after it warmed up, and would bog at full throttle. I had to fully close my pilot adjustment screw. Luckily mine works when fully screwed in so I don't have to replace the pilot jet.
Awesome video! Very informative.
Great Job
Amazing vid, thank you!
I recently started working for an old guy i thought he knew what he was doing. It bogs down anywhere above 1/4 throttle he keeps having me drill the pilot jet bigger. Its about double the spec and it now runs well up to 1/3 but is still bad above that.
I need to adust the needle up as int the nedle is higher right?
A lot of info! I'm wondering how to adjust the throttle return spring on 1992 big bear 350? It has been sitting for a few years and the return spring is very tight.
It's not the return spring, its the cable being corroded and lack of lubrication. Try a new cable and see if that solves your problem.
I have a question, why does my dirt bike keep fouling plugs? When I pull the plug, it looks all black and its fuel soaked after just a few minutes of riding.
Would popping thru the carburetor be considered a lean condition? 1990 kawasaki Bayou klf300c with Aftermarket Chinese carb.
Just had same condition on 200 Yamaha. Mine would not get past idle with throttle unless on choke. (Completely clear pilot circuit) my fix was going 1 size up on pilot jet. Make sure your new Chinese carb has the same jets. It may have smaller as they are usually geared towards 125cc or less machines. Good luck let us know your fix!🤞👍
Don't buy Chinese carbs! they are junk. you are better off rebuilding the OEM carb.
Wow U spent some time making this vid just came across it thanks heaps subscribed 👍
I have two different atvs both only run with the full choke on , and run very fast , remove choke and the engine dies , I have replaced carbs and still same issues any ideas thanks
Fantastic video!!
Thanks for the positive feedback!
Awrsome video! I got a kx250f 2009 and im having a hard time tonstart it when its hot. Any tip to solve that? Is driving me crazy.
Check the Hot Start lever adjustment. But for the most part your bike needs to be tuned to you elevation and riding conditions by a good mechanic. The other issue that might be going on is your intake valve clearance adjustment is tight causing the intake valves to not seal correctly causing compression to push back into the carburetor that will not allow the fuel and air to be sucking into the combustion chamber for internal combustion to happen.
EXCELLENT VIDEO
I have a 4 stroke atv 2000 Kodiak with an aftermarket carburetor when I go full throttle the the engine stutters. Will that be the wrong jet size?
Thank you
Could be. Sounds like the main jet might be too big. You can verify by trying to rev with the choke on, stays the same or worse=smaller main, better=bigger main. Then with choke off and air box lid off, rev it again, better=smaller main, worse=bigger main. This is assuming you've checked all the basics (fresh fuel, clean air filter etc.). For reference, our QA Parts carbs that fit your ATV come with a 120 main and a 45 pilot. If you can't get the carb you have ironed out, I'd try the QA Parts carb and be done with it. -Charles
@@rmatvmc thank you I will try this
Good luck, let us know how it goes!
Thanks for the info vary accurate 👌
Great info
Love the vids people 👍🏻
Great vid as always.
If there called “deadlines” where would they lead ? Or where would I put them
Really excellent video!
Thank you for explaining all this. Majorly helped! I did have a question. What is the electrical wires that go into my carburetor? 2000 Kawasaki prairie 300 4X4
They are either for a TPS sensor or Electric choke.
I have a 150cc 2018 BENNCHE 4 wheeler that setup for like 6 months and I replaced the battery and also had to replace the fuel filter because it was leaking but anyways my 4 wheeler is hard to start and when it does start it bogs down and dies on acceleration and then I noticed there was gas in my oil so is that my float valve
Hi Steve. I'm your new subscriber from KSA. I got small bike the Honda TMX 155. My plug reading was fine so far having a light tan color which means i got a desired mixture. My issue is that, i can't start my bike with a single kick after overnight parking. It takes 3 - 5 kicks to start w/o choke. And sometimes, takes more kicks if I choked it. Around 8 - 10 kicks if parked over a week. Some owner's and mechanics of this bike said that it is normal for several kicks but i'm not convinced. The average morning temperature in my place was 30 "C. Can you give me some hints to check as I want a single kick every cold start?
Hi Jeaven. It can be normal to kick it a bunch of times, especially if its cold. If it were mine I would adjust the low speed fuel screw and turn it out 1/4-1/2 turn to richen up that circuit. There might be a tamper proof plug installed in the way of the screw that may need to be drilled out so you can adjust it, but that's the solution to your issue.
If I uncork my ttr125le 2019 pull out my air vent and drill two one inch holes do I have to replace pilot from stock 15 to 17.5 pilot. Still stock pipe untouched.
I'm not sure you can call that uncorked. If you are wanting more air flow you can do that and yes you most likely need to go a bigger size in pilot jet. First I would adjust for elevation in your jetting, that might make all the difference in running conditions that you are originally seeking for.
I got a question, every time I type in this engine number, SC39E 2101372 I dont get no results. Could you be able to tell me the size of the motor, its a honda valkyrie, but it is not the flat 6 motor, please and thank you.
Was wondering if you can help me with my carburetor problem. Have a 98 yamaha big bear 350 4x4. Someone totally demolished the carb. All jets, pilot screws were cross threaded and ruined the carb. I got a new one, cleaned it from top to bottom and the only way it will idle is with the mixture screw all the way out to where it's almost falling out. I can get it to Rev up only if I slowly feather the throttle. If I punch it, it immediately boggs and dies. Sometimes it's fine on half choke. I've put smaller and larger main jets and the only thing that changes is full and half choke work properly. Still have to have the mixture screw all the way out and it boggs on quick throttle. I'm at wits end trying to figure this out. Ove cleaned this carb probably 10-15 times. Can anyone help? Thank you
This is awesome. Learned a lot 👌🏽
Somebody please help me. I had to change the carb on a 2019 Chinese Apollo 250 with a nearly identical unit. It idles fine, but it backfires and cuts out when accelerating. The plug shows that it's running lean. I'm thinking of putting a better carb, Mikuni, in there but it's so hard to get in and out I want to make sure it's properly jetted. I'm at 4500' Will the Mikuni also need to have a bigger main jet and a raised needle?
You will most likely need to rejet any carburetor for your specific riding conditions and elevation.
"You'll see this on generators..." and jet skis. Mikuni Super BN is great.
Do you have a kit. For 2006 suzuki eiger 400 ?
We have carburetor repair kits for your ATV that you can check out here: www.rockymountainatvmc.com/parts/atv-fuel-and-air-intake-systems?v=2006-suzuki-eiger-400-4x4
If the hose where my air filter hooks up isn't connected to the carburetor would it make my four-wheeler lose some. Horse power.
Could you help me find the vacuumed line diagram or at least help me figure it out thanks
What size Carburetor does a 1990 Suzuki LT250s QuadSport is ? I had it messured and it is 32mm on the outside & 23mm on the inside............
The stock carburetor on a 1990 Suzuki LT250S should be a Mikuni 34mm.
@@rmatvmc We had it messured they said it was 32mm it is a round slide
Thanks.
What about fuel from overflow?
What is the function of the air cutoff valve on a CV carb ?
I think nobody knows, because i never see an answer to this question.
as far as I know, it is used when you start the bike. at that point you need only fuel to get through and so you "close" the air stream. after the engine has started, you let again the air mixed with the fuel. I hope I'm getting that right...:)
Nice video
recently i replaced the old carburator on my 89 big bear 350 with a ruijie one that is supposed to be for that year among others, it was much harder to start as soon as it was installed and now that we have some snow down and needed to plow the driveway the bike started moved 15-20 feet, died when we went to shift to reverse and now we cant get it to start at all
well if the original rebuild-able carburetor is gone maybe another chinese copy will be better a 2nd time
As I was looking at the schematic for the 2001 Honda 400EX carburetor I see a jet that nobody speaks about. Everybody talks about the choke the float bowl the pilot Jets the main Jets the needle and then settings but nobody speaks of number 38 in the schematic for the 400EX I'm pretty sure it's the same carb as the 300EX maybe the 450 number 38 in the schematic JET, SLOW AIR (#110) what's that about?
I just put a new carburetor on my warrior 350 it’s running way to high n will not stop I adjusted everything I can what can be the problem??? Please help
Check throttle cable free play and adjust the idle screw down.
thanks
Thanks bro
Which way do I bend the float needle to shut of more fuel. I have a Honda rancher that I think is getting too much in the bowl. Exhaust smells like fuel and crankcase getting fuel
You'll want to bend the tang up towards the needle, which will in turn allow your float level to be set lower. Unfortunately, we don't have a video on setting float level but there are some great videos on TH-cam showing the process.
Rocky Mountain ATV MC thank you very much. Out of adjustment will explain what I meant ones correct?
Where to buy a carburetor for a 2002 Honda rancher a t v 350
Check out the QA Parts Carburetor: www.rockymountainatvmc.com/parts/qa-parts-carburetor-p?v=1925
Ty ty ty!
I have the issue on my coolster 100cc. Idles fine usually soon as I give it alot of throttle it dies down
It must be lean move the clip on the needle
Downward is more rich on clip position
How to fix back firing through my 1990 Harley Davidson carb do I increase or decrease my timing
Backfiring can have a few causes but if you've isolated it to timing you can try advancing it and see if that helps. Also check your fuel pump and filter are both working correctly.
Its not timing, its carbonation being incorrect. or you have a exhaust gasket leak.
What is the this in the thumbnail?
I have it on my carb as well as an electric enricher. It has 4 wires connected to it
I believe you are referring to the TPS (throttle position sensor).
@@rmatvmc yes it is on the opposite side of the throttle thank you! I have trouble getting the right ratio on my scooter.. its 4stroke and have only one mixture screw, how do i know if its working properly?
What should the idle speed be on a hot Honda 125 engine?
It will depend on your exact engine but the idle speed will generally be around 1,100 to 1,500 RPM.
@@rmatvmc This is a bike with only 2000 miles. The idle was 1000 rpm. The headlight would blink at 1000 and would not start electrically. The battery would go dead so i turned it up to 1300 so the headlight stays bright. I think the problem is fixed but if in happens again i will replace the battery. Thanks
I’m having a problem with a raptor 2001 660r one of my customers bring me a carburetor which after install it’s leaking fuel on the air filter side of the carb are two holes looks like little brass bushings only one of them in one of the carbs is leaking somebody here have an idea what are those holes for or how to fix the problem?
Check the float valve and O-ring on the float valve seat. Most likely the cause.
Word.
Awesome, I didn't know backfiring was a lean engine, I'm Due to fit a 30mm carb to my Atv
I have yet to find a video where someone simplifies where the damn fuel line input is and the outlet 😣 wtf can someone help? I’ve got 2006 Yamaha Kodiak 400
I spot a Lectron carb!
Had to show off that clear float bowl ;) Good eye.
Thanks for watching!
Should have explained how that bad boy works.
I would have but we were trying to keep to the basics of carburetor function.
Dr Carb!
20:40 I think he switched up lean and rich points
Dosalt please explain your point