Clayton! You are the man! I have been racking my brain for 4 weeks now! Reading forums! Running through everything on the bike! Nothing would work! It was running like crap backfiring and not idling right and would just die once it was off choke. Cleaned the carb and changed jets like no other! And I totally forgot about the needle! Changed the needle and looked at that plate and it was upside down! Sucker runs so smooth now and after reshimming it runs even better! Thank you so much!
Doing this to both my 2001 yz426f and wr250f. This is the best detailed video out there. So many tiny mistakes you can make if you dont pay attention to detail. My midbodies had 2mm allen screws inside float bowl and 2.5mm allen outer carb.
Hey Clayton Thank you for videos as they have helped me with my build, With no mechanical experience I have followed your videos. I had a riding weekend after a 6 month build and bike did not miss a beat. I bought bike not going did a total rebuild. I found your videos more informative than anyone else's on here. Thanks again m8
Well I cleaned the carb really well and blew out all the air/fuel passages. I went from a 178 main jet to a 172 and 42 pilot. Installed gaskets , mid body as well. Note; the needles from Jd jetting are the exact length as the stock needle! I changed my fuel pump diaphragm and did the mod jd recomends a little shim that goes on top of the diaphragm nipple. New twinair air cleaner.........I just started up and adjusted the air:fuel mixture and idle ,i filled the fuel bowl and tested it🤣🤣🤣 it niw shouts fuel like an injector😂 it started rait up and runs like a CHAMP 🤙🏽🤙🏽🤙🏽🤙🏽 Thank you fir your vid ..they helped a lot! Oh...🐒..go KTM! They are super well built bikes,! Note; clean and blow out the area where the needle sits,even good to polish that area for perfect needle/seat action😃 ,also there are two really small holes in that recess that need to get blown out with compressed air,also good to blow out the idle circuit areas as well🤙🏽
Great job Clayton. The only thing I would add is to polish the float valve seat. I never did it either but had a leak, watched a video where a guy took Brasso on a Q Tip in a drill and polished the seats bore at a low speed. I think he cut the Q Tip in half which is good since I could then use my Dremel tool and adjust the speed. If you have a screw next to your seat it is removable like mine. Good since you can change the O-Ring and clean the screen filter that's on the seat. Liked and subscribed!
Rebuilt my YZ426 carb and thought I was done, bike still runs like crap and won't kick start, adjusting valves and buying this kit because the mid carb was so tarnished when I took it back out. Thanks for the vid.
Great video. I've got the 2005 wr450 runs great but pops a lot on decel I'm at a 170 Main and 48 pilot should I go up on the pilot a few sizes? Thank you
It would be very helpful if you actually showed the camera what parts you are dropping into the bottom of carb before u screw them in, so we can see which goes where. I am grateful for you making this video, had a guy come over that claimed he could rebuild my carb and took it all apart without me being present and failed. Now I'm trying to piece together what he took apart. 😮💨
where did you get your rebuild kit? what parts were needed for the rebuild? i bought a kit from All Ballz Racing but it doesn't have all the gaskets to do a full rebuild.
FANTASTIC how-to between this and the first vid on the tear down! I feel super confident now. I’m very mechanically inclined but carbs can still be intimidating. Especially slightly more complicated ones like these. What do you recommend for new vent line? Also, do the all balls rebuild kits include the 3 o-rings for the fuel inlet fitting where the fuel supply line hooks up? Thanks Also liked and subbed ;)
Hey Jason thanks for the comment! For the o-rings on the fuel inlet I would just order the OEM ones from a parts supplier as they aren’t to my knowledge in the kit. The vent line is any 1/8” line, but there are places online to get different colored vent line. Hope this helped
@@claytonmotos2816 yeah, dumb question on the vent line. Found it on Amazon 2 minutes after I commented. Was definitely curious on those o-rings for fuel fitting though. I want to replace mine. Since you had extra o-rings left over, I was wondering if those were perhaps for that fuel fitting. Thanks for the reply!
Those o-rings from the kit weren’t the right ones. The OEM part number is 3TJ-14564-40-00 and i remember having to order them separately. Hope this helps!
Good video and very informative. Just a note I think you put the slide plate seal on the wrong way round. It is designed to push the plate way from the slide 👍
hey there great vid few questions if you dont mind i have 09' wr450f it always works super lean no matter what 5th gear bogging all the time and no power what so ever it has yzf450 exhaust airbox and gray wire mod should i install the stock size starter and pilot and leak jet that comes with the kit ? thank you in advance
If I were you I would install YZ450F jets and maybe take the needle up one clip position to increase the fuel flow at wide open throttle. It’ll take some tuning so you might want to pick up a jet kit as well to play around with the jetting. Good luck!
Hey man, I just rebuilt the carb on my 2004 yz250f. The bike was running at the end of last season but I decided to rebuild the carb this spring cuz I knew it needed to be done. Only reason it ran last season was because I had a family friend clean the carb and he recommended it be rebuilt. Anyways I’ve rebuilt the carb and now replaced the fuel petcock but I can’t seem to get the bike tuned right to idle well. Just wants to die on me unless I keep it alive with the throttle. I could really use some advice as this is the first bike I’ve ever had. Would rather not have to wait to get it into a shop and pay big bucks for what I truly believe is just a tuning issue. Please let me know what you think I’d really appreciate it!!!
Hey man thanks for the comment! Have you tried adjusting the idle screw and fuel screw? It could also be a valve lash issue if that hasn’t been done in a while.
So if you want to show something really interesting, show us how the accelerator linkage comes out of the main body and how it goes back together. I think you cleaned the main body without taking it fully apart. I can’t figure it out either.
Most of the parts should be interchangeable. The jetting and needle may be different so keep the old parts to compare them to the new ones before reinstalling!
Okay so after much research yamaha managed to track down my bike information, I have a 03/04 frame and a late 04 early 05 engine, it has a five speed box not a 4 speed the engine is a yz450fs or a 5xd4 but it's a unciculated engine as the engine serial number doesn't show up on their databases. The real question is... do I buy a 04 carby kit or a 05 kit or a 06 kit or a 03 kit lol and what if any differences would there be between them?
Buy whichever kit you have a carburetor for. After that rebuild the carb and put it on. A carburetor’s purpose is the same no matter when it was made so it should work for your set up as long as it was originally a YZ450F carb. Hope this helps.
The only time I used a non-stock needle I had a boggy, sluggish bike which was completely fixed by changing back to the stock needle rather than using the supplied needle.
The only time I used a non-stock needle I had a boggy, sluggish bike which was completely fixed by changing back to the stock needle rather than using the supplied needle.
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Clayton! You are the man! I have been racking my brain for 4 weeks now! Reading forums! Running through everything on the bike! Nothing would work! It was running like crap backfiring and not idling right and would just die once it was off choke. Cleaned the carb and changed jets like no other! And I totally forgot about the needle! Changed the needle and looked at that plate and it was upside down! Sucker runs so smooth now and after reshimming it runs even better! Thank you so much!
Thanks man I really appreciate that! So glad I could help out!
Clayton Thank You for making this video, you did a great job explaining everything.
Doing this to both my 2001 yz426f and wr250f. This is the best detailed video out there. So many tiny mistakes you can make if you dont pay attention to detail. My midbodies had 2mm allen screws inside float bowl and 2.5mm allen outer carb.
Unreal guide mate - very clear and detailed, nice work.
Great video! Did my first carb rebuild with it. Thank you for your time and energy.
Hey Clayton
Thank you for videos as they have helped me with my build,
With no mechanical experience I have followed your videos. I had a riding weekend after a 6 month build and bike did not miss a beat. I bought bike not going did a total rebuild.
I found your videos more informative than anyone else's on here. Thanks again m8
Glad I could help you out! Thanks so much for the positive feedback!
great detail, some videos edit out the critical points. Very helpful thank you Claton!
Really helpful brother...WELL DONE!!!
Really great info. Thanks for putting this together.
Great video buddy! Thanks for sharing!!!!
Quality video, thanks for the tutorial
Thanks so much for doing this vid. Very helpful!
Thanks M8, much appreciated. Going to do this this week, never to late for an old dog to learn new tricks.
Thanks for the video man I watch a couple and still had some parts left over and was like wtf.. you were very detailed so I got it all back together
Well I cleaned the carb really well and blew out all the air/fuel passages. I went from a 178 main jet to a 172 and 42 pilot. Installed gaskets , mid body as well. Note; the needles from Jd jetting are the exact length as the stock needle! I changed my fuel pump diaphragm and did the mod jd recomends a little shim that goes on top of the diaphragm nipple. New twinair air cleaner.........I just started up and adjusted the air:fuel mixture and idle ,i filled the fuel bowl and tested it🤣🤣🤣 it niw shouts fuel like an injector😂 it started rait up and runs like a CHAMP 🤙🏽🤙🏽🤙🏽🤙🏽
Thank you fir your vid ..they helped a lot! Oh...🐒..go KTM! They are super well built bikes,!
Note; clean and blow out the area where the needle sits,even good to polish that area for perfect needle/seat action😃 ,also there are two really small holes in that recess that need to get blown out with compressed air,also good to blow out the idle circuit areas as well🤙🏽
Good stuff mate. 👍
Well done you covered everything step by step good gob thanks 😊
Great video
Great job Clayton. The only thing I would add is to polish the float valve seat. I never did it either but had a leak, watched a video where a guy took Brasso on a Q Tip in a drill and polished the seats bore at a low speed. I think he cut the Q Tip in half which is good since I could then use my Dremel tool and adjust the speed. If you have a screw next to your seat it is removable like mine. Good since you can change the O-Ring and clean the screen filter that's on the seat. Liked and subscribed!
Nice job leak testing the carb before putting it on the bike and testing the accelerator pump. Good video
Really tempted to do this
excellent vid!
well done lad well done
thank you dirt bike michael cera!
Rebuilt my YZ426 carb and thought I was done, bike still runs like crap and won't kick start, adjusting valves and buying this kit because the mid carb was so tarnished when I took it back out. Thanks for the vid.
Very helpful thanks
El mejor video gracias!
good job
Nice one. Thanks! #197
Dude your videos are really helpful and detailed, thank you so much
awesome video so thorough and you put it together slowly.
Hey man, thanks for the video.
Quick question.
Where did you find the rebuild kit with all the gaskets and stuff?
Good video man, but why didnt you use the 4 small o rings that come with the kit that go on the bolt holes of the midbody?
Great video. I've got the 2005 wr450 runs great but pops a lot on decel I'm at a 170 Main and 48 pilot should I go up on the pilot a few sizes? Thank you
Bro make a tuning vid of the fcr detailed please
It would be very helpful if you actually showed the camera what parts you are dropping into the bottom of carb before u screw them in, so we can see which goes where. I am grateful for you making this video, had a guy come over that claimed he could rebuild my carb and took it all apart without me being present and failed. Now I'm trying to piece together what he took apart. 😮💨
where did you get your rebuild kit? what parts were needed for the rebuild? i bought a kit from All Ballz Racing but it doesn't have all the gaskets to do a full rebuild.
What fluid do you use in your Ultrasonic cleaner for carbs? And how long do you run it for?
Great video, my mid-body o-rings were Silly Puddy due to sitting.
Hi What size driver for mid body screws? allen or torx Thanks
hi congratulations for the video where I can buy the gasket kit for the Keihin. grasie I await your kind reply
Id be happy for your help
My 09 after carb rebuild and jd jetting kit
Only bogs in fifth
Any ideas ?
Any reason why you didnt change the seat out with the new needle?
My 2004 yfz450 is pouring gas into the oil pan. Is there something wrong with the carb or would it be something else?
FANTASTIC how-to between this and the first vid on the tear down! I feel super confident now. I’m very mechanically inclined but carbs can still be intimidating. Especially slightly more complicated ones like these. What do you recommend for new vent line? Also, do the all balls rebuild kits include the 3 o-rings for the fuel inlet fitting where the fuel supply line hooks up? Thanks
Also liked and subbed ;)
Hey Jason thanks for the comment! For the o-rings on the fuel inlet I would just order the OEM ones from a parts supplier as they aren’t to my knowledge in the kit. The vent line is any 1/8” line, but there are places online to get different colored vent line. Hope this helped
@@claytonmotos2816 yeah, dumb question on the vent line. Found it on Amazon 2 minutes after I commented. Was definitely curious on those o-rings for fuel fitting though. I want to replace mine. Since you had extra o-rings left over, I was wondering if those were perhaps for that fuel fitting. Thanks for the reply!
Those o-rings from the kit weren’t the right ones. The OEM part number is 3TJ-14564-40-00 and i remember having to order them separately. Hope this helps!
@@claytonmotos2816 that helps very much so. Thanks again and happy riding😁
Hey , where you but a mid gasket (body gasket) ?
Answer me this if anyone knows but these carbs look all the same on these 450 bike from one brand of bike to another. Are they all the same brand?
If you find a supply of the centre body gasket o ring for the road race version of the FCR please post a comment.
Does anyone know the name for the two brass towers? I need help finding the name or part number. Any help would be appreciated!
Good video and very informative. Just a note I think you put the slide plate seal on the wrong way round. It is designed to push the plate way from the slide 👍
Thanks for your concern!
hey there great vid
few questions if you dont mind
i have 09' wr450f
it always works super lean no matter what
5th gear bogging all the time and no power what so ever
it has yzf450 exhaust airbox and gray wire mod
should i install the stock size starter and pilot and leak jet that comes with the kit ?
thank you in advance
If I were you I would install YZ450F jets and maybe take the needle up one clip position to increase the fuel flow at wide open throttle. It’ll take some tuning so you might want to pick up a jet kit as well to play around with the jetting. Good luck!
@@claytonmotos2816 i have a jd jetting kit
Hey man, I just rebuilt the carb on my 2004 yz250f. The bike was running at the end of last season but I decided to rebuild the carb this spring cuz I knew it needed to be done. Only reason it ran last season was because I had a family friend clean the carb and he recommended it be rebuilt. Anyways I’ve rebuilt the carb and now replaced the fuel petcock but I can’t seem to get the bike tuned right to idle well. Just wants to die on me unless I keep it alive with the throttle. I could really use some advice as this is the first bike I’ve ever had. Would rather not have to wait to get it into a shop and pay big bucks for what I truly believe is just a tuning issue. Please let me know what you think I’d really appreciate it!!!
Hey man thanks for the comment! Have you tried adjusting the idle screw and fuel screw? It could also be a valve lash issue if that hasn’t been done in a while.
6:19 slide gasket is mounted backward as it shoulds
The bike ran fantastic with no issues. Thanks for your concern!!
Nice video! Where i can find this kit? Can you paste the link there?
Thanks
I get all my parts at RockymountainATVMC!
Going to try to rebuild my 2006 YFZ450 carb, this one looks the same as mine. Can I use this video as a guide to rebuild? Thanks in advance!
Yes. This video is pretty much universal to all Keihin FCR carburetors!
@@claytonmotos2816 Awesome! Thanks for the quick reply, great video 👍
So if ur accelerator pump is good and ur carb is clean but u still get lean bog whadayoudo?
mid body
So if you want to show something really interesting, show us how the accelerator linkage comes out of the main body and how it goes back together. I think you cleaned the main body without taking it fully apart. I can’t figure it out either.
Oh man! That was a pain to figure out. I’ll be uploading a video on that soooooon!
Where did you got that gasket kit from?
I got it from Rocky Mountain ATVMC. It’s called the mid body gasket kit.
Can I use 2003 yz450f fcr carburetor rebuild kit for 2003 wr450f fcr carburetor? Is it fit?
Most of the parts should be interchangeable. The jetting and needle may be different so keep the old parts to compare them to the new ones before reinstalling!
🖐️🇲🇾
can you please share the links to the rebuild kits you used
www.rockymountainatvmc.com/parts/all-balls-carburetor-repair-kit-p
www.rockymountainatvmc.com/parts/all-balls-carburetor-mid-body-gasket-kit-p
www.rockymountainatvmc.com/parts/all-balls-accelerator-pump-rebuild-kit-p
Will 06 yz450f carb work on a 08 model engine?
The OEM part numbers are different for them so it may take some additional tuning.
Okay so after much research yamaha managed to track down my bike information, I have a 03/04 frame and a late 04 early 05 engine, it has a five speed box not a 4 speed the engine is a yz450fs or a 5xd4 but it's a unciculated engine as the engine serial number doesn't show up on their databases. The real question is... do I buy a 04 carby kit or a 05 kit or a 06 kit or a 03 kit lol and what if any differences would there be between them?
I also have a 06 carby here, will it work on my engine lol
Buy whichever kit you have a carburetor for. After that rebuild the carb and put it on. A carburetor’s purpose is the same no matter when it was made so it should work for your set up as long as it was originally a YZ450F carb. Hope this helps.
can i send you my carburetor?
The stock needle is not what you want the taper on it is to dramatic. That's why JE sends you a choice.
The only time I used a non-stock needle I had a boggy, sluggish bike which was completely fixed by changing back to the stock needle rather than using the supplied needle.
The only time I used a non-stock needle I had a boggy, sluggish bike which was completely fixed by changing back to the stock needle rather than using the supplied needle.
That’s a big bandage...
All after market junk. Yamaha made Japan parts are expensive for a reason.
😂
At 4:46 when measuring the needle , your measurement should have been from clip position to the tip not from the top to bottom of needle !!
Great video otherwise
Just trying to show the overall difference in length for a kit that claims to send the stock needle.
@@claytonmotos2816 still got to send the correct message , right ?
Which is the aftermarket needle may be correct !!
so much complexity........and they didnt even use a proper emulsion tube.
Your washers are the wrong way around mate. Steel washer goes against the carb body then the teflon. No biggie.