9.9HP Mercury Outboard Carburetor Cleaning/rebuild
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- เผยแพร่เมื่อ 16 ม.ค. 2015
- A look at how the carburetor works on a small outboard, and how to remove, disassemble, clean, and reassemble the carburetor. At the end of the video we will also talk about how to set the air/fuel ratio (mixture) using the idle adjustment screw and mixture adjustment screw.
Dude, your old video are gold. Thanks!
Oh man, you did more than just save me money, you gave me CONFIDENCE!. I just successfully fixed my 9.8 Evinrude (it's a Tohatsu engine, really) after watching your video. My motor died while out 2 days ago - and because it's spring all the shops are saying it's 3-4 weeks before they can even look at it. I changed out my gas first, tried Seafoam treatment but no luck. So, based on your video, I took the Evinrude carb off (it's pretty much identical). I followed your cleaning directions and re-assembled. Pumped the gas and she started 2nd pull ! And is now purring like a baby. I've never touched a carb in my life until today. THANK YOU.
This is one of the best mechanic videos I have ever seen. Every step is explained, all the parts and pieces are described, the functionality of the engine and components are relayed to the viewer. Thank YOU for taking the time to do this. I wish more mechanic videos were this great.
I'm in the middle of this right now, frustrated as hell, took a break and found your video. This gotta be the most informative video I've ever watched. Bravo sir
Same. Just ordered a plethora of parts today
Followed this tutorial and got my motor running! Thanks!
Dear Technician, thank you very much for this detailed and explanatory tutorial. With your step-by-step verbal and visual guidance I confidently disassembled, checked, cleaned and reassembled my Mariner 9.9's carburetor and gained an insight into its functioning mechanism. My motor is running smoothly again owing to you. Warm greetings from Mugla (Milas), Turkey.
It’s been said, but wow, I think that is the best tutorial I’ve seen.
I have had my boat/motor for about 5 years purchased lightly used. It started running rough and then not at all last season and has been parked since. I recently have wanted to use it but have no mechanical knowledge and searched for about 3 months for explanation’s to my issue with little answers leading to the carb, but no good step by step how to on fixing it. I was communicating with a local mechanic and set to drop it off in the next couple days, when I came across your video. Your well executed very easy to follow step by step vid gave me the confidence to do the job myself. Thank you so much for the knowledge and confidence you provided and God bless you!!
This was a very helpful video for me. The one thing that I’ll add is this (which I discovered while cleaning my carburetor) I started off by using starter fluid rather than carb cleaner to clean the parts. The first time I took it apart, I removed the gasket between the bowl and the rest of the carburetor and I had no problems fitting it back in. The second time I pulled it apart, I was using carb cleaner. Unlike the starter fluid, carb cleaner caused both my rubber gloves and the rubber gasket to expand. In order to fit the gasket back into place, I had to clean all of the carb cleaner off from the gasket and wait a few minutes for it to shrink back to normal size.
Thank you SO much! Not only did your video teach me what I needed to know to fix my Mercury 9.9 kicker, which would not idle at all, but now, that particular problem will never cancel another boating event, like it did yesterday. All I needed was carb cleaner, two blade screwdrivers, rags, a 10 millimeter socket and an extension. I also used a guitar string which fit through the idle jet nicely and removed a stubborn piece of debris. I totally appreciate you sharing your knowledge. From now on that list of tools is on my sailboat.
Thanks Rowintel for this outstanding video. It gave me, a novice mechanic, the confidence to dive in and clean the carb on my 8hp 4 Stroke Merc which was running rough or quitting at idle
and unusable for trolling. The carb was indeed dirty and I cleaned it per your instructions. In the process, I learned how carbs work. After putting it back together the engine started easily and purred like it should. The idle and mixture adjustments shown at the end of the video were invaluable. Fortunately, the brass plug for the mixture adjust screw had already been removed so I didn't have to deal with that drill out. Your background explanation and then step by step explanations exemplify what good how-to videos should be like. Well done and Thank You!
Glad it helped!
Mine just died coming into the marina! Clean it before it's too late! 😂
Could not have said it better !!! I am a good mechanic but a quick video when you are in new territory is a huge time saver. This was well done !!!
I also thought the float might be stuck in the open(down) position but that was not the case. I disassembled the carb and cleaned it as per the video - some clogging in the high and low speed jets but gave both a good cleaning.
I really think pumping the bulb rock hard forced too much gas to flow and stalled out the engine.
After reinstalling the cleaned carb and two pulls on the rope, she started right up on the third pull and runs like a charm, even at idle.
I would not have attempted this repair without this video. The first I could get in for a repair was one month away and goodness knows how much money.
I hope that this mechanic and his team will feel really encouraged do more videos.
They are providing an amazing service.
Sam
Thanks for the video! I followed your steps and cleaned my carb, getting my boat to run for the first time in 2 years.
Thanks dude! A friend sunk my boat and the 9.9 merc was under water for a month before we got her up. I had no problem at all getting it to run again, but it would not run right. I knew it was the carb but had never taken one apart before. Using your excellent video here I took it all apart, cleaned, put back together in one hour. Motor started right up and runs great now. I was all set to spend almost $300 to have the local shop put a new one on. I thank you many times over for your excellent instructions. You did an excellent job.
The author's extra comments helps compensate for me not having anyone to help me. For example the brass/aluminum and stainless steel aluminum helped me. Also, confronting the reality of screw ups by telling the cost of both screws and carbs, helped us face the reality that 'screw' ups happen.
I gotta pull mine back apart. Thought I cleaned it good, but I did not take the jets out and clean it. Put it back together and still did not run. This is the only video I watched that even took the jets out. Thank you👍
Thanks man, pulled them jets out and cleaned the them. Now it's running and idling great. Liked and subscribed.
Just used your video to clean my Merc kicker carb ...finished in half an hour because of your excellent explanations. Thanks!!
Thanks for the video. I have the TOHATSU MFS 8 that would kick over but not stay running. Felt it wasn't getting fuel and was hoping to find someone on TH-cam showing how to remove and service the carburetor. Easily removed and took apart the carburetor, thanks to your video. It was a mess and after a good cleaning runs awesome. Thanks again
Great video! Got my 9.9 kicker fired up after watching this excellent presentation on how to take off the carb and clean out the jets! Thanks!
This was just the video I was looking for. Good job explaining the procedure - Your voice is easy to understand. I was hesitant to clean my 15hp Merc Prokicker. The motors are surprisingly similar. Thank you for a great lesson.
I ALMOST gave up on trying to learn how to do this. Thank you SO much. I watched so many useless videos where the author just assumed I knew how to do so many things. THANK YOU!
Had trouble with poor idle performance. Followed this process and saved what was quoted as an $800 repair job. Engine ran just perfect without do the drilling out of the idle adjustment step. Thanks for the detail.
Thanks so much! You saved me $200 - and more importantly, you save me two out-of-order weeks during our precious short summer on the water
That shop is kept so neat, it looks well organized, and everything is in place.
Thanks, my motor had sat idle for a couple of years. I thought that allowing it to run out of gas by disconnecting the fuel line would prevent carb problems. It started after a lot of rope pulls but acted like it was starving for fuel. I replaced some components of the fuel supply system but didn’t help the prob. Checking with mechanic he thought it could be the carburetor and he could get to it in about 4 weeks and would cost $250 to $300. I watched your video and followed your instructions and it is running great. Starts first pull now and responds perfectly to the throttle. Great video. Thanks a lot.
Own a 15hp mercury and last weekend it started great but then stalled out.
Removed cowl and saw standing gas in the bottom of the housing. Cranked her over and gas poured out the bottom of the carb. This was after I had pumped up the primer bulb to rock hard as fellow at boat ramp suggested. Pulled the start cord again and motor ran briefly but rough.
I inspected the 2 plugs and both were badly flooded.
I let it sit for about an hour, pulled the cord and she again ran briefly but rough.
When I got the boat home I cruised You Tube and suffered through several abysmal videos on carb cleaning - no tripod, horrible sound, terrible lighting - one was even on a boat and was hand held - I almost got sea sick.
Your video is clean, well organized, great lighting and pretty good sound.
I think your use of the go pro for closeups was great.
I followed right along with your video in little chunks and eventually finished my carb overhaul.
I get to try it tomorrow morning.
Sam
This was the best video out there. Watched it twice and went for it. So now my 9.9 is running like better than Dillinger after a bank robbery lol. Thanks.
Excellent Video and content. I like that you know the parts of your carburetor and you where very thorough with details. Fixed my 9.9 carb issue. Clogged low speed jet. Symptoms where would not run with closed choke. Gratitude.
Great video and tips! Gave me the nerve to fix my 9.8 4-cycle Tohatsu which started fine and would idle fine; however, it would shut off when throttled. Every 2-3 years I've had to take it to repair shop for similar problems - costing from $79-125 plus. Bought a can of carburetor cleaner for less than $4 and spent an hour or so carefully following you video. Removed, cleaned thoroughly, and reinstalled - started right up and ran perfectly! Thanks!
Thanks for this video, watched it while I tore my carb apart on the bench, very concise and went from non running pro kicker to an engine that purrs like a kitten and started first pull.
Awesome video thanks for showing us , had to clean my carburetor after laying on wrong side while in a hurry, lesson learned.
Great video, our 9.9 would not start this year, did whet you showed, fired right up, thanks for the great vid.
Very helpful. You made the job look easy. Motor is running great now thank you.
Great vid. I have the same 9.9 except 07' model. I had to clean the carb the other day and ever since it wants to die when I shift it into gear...I'm thinking it's the idel screw now that I've watched your vid. Great vid! Very in-depth and helpful.
Probably the best instructional video I have seen on youtube. Good going. can`t wait to open up my Mercury.
Thanks! Glad it helped!
Bought a 9.9 Merc brand new 2.5 years ago. Not 50 hours of run time after break in, it would either stall at mid throttle cruusing or stall coming off the throttle. Dealing with the dealership repair (under warranty) has been a nightmare (6 trips..long waits). Last trip was to another dealer...they actually got it running right. Said carb was dirty. That was about 3 running hours ago (two short trips) and I'm back to square one. I'm going to follow your instructions to see if i can get it running. BTW, this engine has never seen one drop of ethanol and i run the carb dry every time i get her home. Never buy a 9.9 Mercury.
Thank you, this was a GREAT video and really helped explain all the impacts of the different adjustments.
Thanks, I just learned a lot about my 9.9 Mercury.
THIS IS......OUTSTANDING. Cleaned my carb today while watching this. Thank you.
Thank you for your information!!!!! I’m working on a 9.9 mercury and I’m pretty sure the jets are clogged I’m gonna fix it tmr with what I’ve learned
I just pulled that overflow hose , thank god you showed me what it was and not knowing where the other end went too
This is very thorough and informative
Awesome breakdown and explanations Bro! Thanks for the education.
This video was so incredibly helpful, thank you
Thank you , thank you . Fixed the issue I was having
Awesome video thanks from Canada
Great job with video!!! Very helpful.
OUTSTANDING, I cleaned the carb reinstalled it and it ran fine. Late in the day I decided to run it again and it wouldn't idle. I took the carb off again and it was clogged again. fuel line and or filter had junk in it..
Great job man!
thanks so much for the video.. helped solve my problem!
Your are the man!! Thank you for an awesome video!!
Yes great video, I been having trouble starting my 5 year old Tohatsu 9.8, changed plugs and fuel filter, once I got it stated I seen gas coming out top of carb, no hose. I'm thinking the float is stuck. I would never remove the carburetor but I will now after watching your video. Thanks
Thanks for the superb instruction - I followed along easily and saw improvement when I accelerate quickly. One thing that remains a struggle on my 4 stroke merc 9.9 is cold starting. Once started, it starts first pull, all day long. It is difficult to start without starting fluid and even more difficult to start without using the throttle only button and speeding up the throttle pretty high. I would really appreciate any suggestions you may have.
solid! thanks for sharing this
Excellent job just what I needed. Any chance you’d have the part number for the carb rebuild kit?
killer video ! Thanks !
Great video
Great instruction.
Great video, very helpful. Quick question, on my 98 4s version the carb look very similar but linkage is diff. Are jets and some other parts compatible from the somewhat newer 15's Is there generally a year range of compatible engines.
You are a genius. Thanks!
Excellent, really helpful, thank you.
Great video! Do you know if the 20hp is much different. Also I can't get the 10mm socket to the back bolt because the air intake is in the way. Any suggestions? thanks
Very nice video. Gonna try air/fuel-mixture screw on my Suzuki df15, that refuses to start. It starts eventually, but it takes way too long to be healthy. Carb has been cleaned twice now, but I haven't drilled out the mixture screw, now I'm Confident I can do it though very basic skill and Tools. Thanks man //Sweden
SwedishDylan Good Luck! Try cleaning the spark plug up real good too!
ROWINTEL.COM Allready installed new plugs in my first effort to get it running, nevertheless, it runs very well now. The mixture screw was way too lean, only about 3/4 out, so I set it to 2 and 3/4 (specs say 2 and 7/8)Thanks alot, really nice how you can help me from halfway round the World.
Thanks for this!
Great job! Go Blue!!
Excellent vid thank u
Great video thanks
great video! On the low speed/idle jet is the hole that goes through the middle supposed to be the same size all the way through? I can blow through it and I can see a very small bit of light through it, but I can't send a small piece of wire all the way through. It goes part way in then hits up against something. Should I get a 32nd drill bit and drill through it?
I have a 2004 mercury 15hp 4 stroke and it will only run when the choke is on. Fuel is getting to the carb and the motor and carb looks very clean, however the brass plug has been drilled out. Before I pull the carb to clean do you have any ideals. Thanks for a great video.
Ron
Hey thanks for the info earlier on. I bought a brand new rebuild kit which i had to take off and put in a new fuel / air mixture screw, (behind the brass plug), float and needle and its running amazing now with no problems while running .. however, now its flooding as if the bowl fills up too quickly. Can the air fuel mixture screw have something to do with that. Maybe to lean letting fuel go in to fast?
i have put in the middle carb seal about 3 times (brand new) but the gas mostly drips out the outer bottom bowl screws. This now is flooding my engine which takes me about 5- 6 pulls to start it up again.. what is your professional advise? Thank you
I notice you are wearing the correct colors.
I have a 25 hp Merc Bigfoot 4-stroke, and this video was a help when I rebuilt it even though the carbs are entirely identical. One odd thing I found was a tiny ball bearing in the bottom of the plunger well. (At least that's where I think it fell from during cleaning.) Ball bearings in the carb are not mentioned anywhere in the shop manual. I just put it back into the well in the center opening at the bottom of the well. However, in quick engine run tests the engine hesitates and coughs under sudden acceleration. Has anyone else ever run across that little bearing? Is it supposed to be there or somewhere else?
Greetings from Norway. Great video as usual! Wonder if you could help me on something. I have the 15hp mercury, it's 321cc but they sell it as a 10hp here, and there's a small plastic stop you cut off to increase the rpm. Was wondering if it would be possible to take it to 20hp with maybe a different carb. There are some stores here that say it's possible, when selling on the website. Would appreciate your advice. I was just wondering if increase the rpm would work, because I notice alot of slack on the throttle linkages?
Great video. I have two questions. Should there be fuel in the priming pump assembly and hose to carb on the front of the motor? Mine has no fuel in the line. Secondly, can you show us how to convert a 8hp to 9.9 on the Mercury? Tx
I own a 15hp, 4 stroke Mercury outboard, 1999. It will not run at idle. I can get it to idle briefly by giving it full choke.
I thought this indicated not getting gas at idle.
I followed along with your video and got to where you remove and cleaned both the high speed and the low speed jets. I got the brass high speed jet out, cleaned and replaced but I could not get the low speed jet out - I could get it unscrewed but was unable to get the actual brass jet removed for cleaned. I tried tapping with the carb upside down but the jet would not fall out.
I gave it a good shot of carb cleaner and will let it sit overnight and try again in the morning.
Any thoughts why the jet will not come all the way out?
Sam
Hi, i have a late model 9.8 tohatsu, it seems identical to the mercury. Can you do a video on how to change the timing belt. Not quite sure how to get the crankshaft pully off. Thanks
Great video,mine is leaking fuel from what you did not take apart,the plunger that gives extra fuel when throttling up ,Iam getting a plunger diaphram for it. Am hoping take care of my leak
Any advice on removing the main jet that just "falls out?" Mine is stuck good and will not come out. The low speed jet came out with a little resistance but otherwise undamaged.
Hi, thanks for the video . My engine, works fine, but twice stalled after going full power for 10 or 15 minutes. After a while it will start again and work perfectly. Also it does throw away some small amounts of fuel to the water after shutting it of. Sounds like flooding of the carburator, perhaps stuck float . Any chance of solving it without dissasembling thw whole thing ?
I have this same exact carburetor but I can’t find a rebuild kit. I’m about to have to buy a new carb all together
This is the best instructional video I have ever seen on the web. The detail that you go into is essential for a full understanding of the job.
Your video gave me the knowledge and confidence to clean the carb which turned out to be the source of my problem - very rough and unreliable idle.
Question - are you a rigger for the University of Michigan?
Great Video! So I cleaned the carb as shown in your video and I still have a fuel leakage issue. the fuel is coming out of the overflow hose when running and also when the engine is off. essentially the contents of the bowl leak out through the overflow hose making a mess. Do I need to order a rebuild kit or look at something different? There was some crud in the bowl when I took it apart this weekend. It did not leak initially when I put everything back together, and was idling around, but after running it hard for a few minutes and then back to idle it now leaks,...actually worse than it did before, although it does idle much better...
Any recommendations would be welcomed...
Bowl gasket may not be any good anymore or not seated properly?
My accelerator pump has gas coming out of the shaft when running. How do you fix that part?
thanks got a 02 merc 15 hp 2 stroke pull start. will not start but a tiny spray of starter fluid and she starts right up but dies. I figure it might had been the needle valve gonna crack it open this weekend
I have the exact same issue on the same outboard. Did you get it figured out?
Hi,can you use a 15 hp. Carburator,on this motor ?i have a 06 4 stroke 9.9 ..thanks
Fabulous explanation. Unfortunately on reassembly I broke the choke into carb black connector piece which has been causing other issue. I realized I could start it in gear override so all good there. Critical is black piece must be turned to correct no choke position. The other day while running black piece somehow shifted on its own and caused breakdown. Not knowing the issue I rowed 1.5 mile back to boat.
I discovered this was the cause so decided to take out all the extra linkage parts and unfortunately took out linkage end connection piece with big spring behind it , oops!!! I am now unsuccessfully trying to reassemble that piece and cannot figure out the whole spring dynamic. I see one end goes into a little hole in carb. It appears other end goes against a part to keep it turned counter clockwise. Unfortunately cannot figure out how to do it or if I am correct. Wish I could show a picture. I have Mercury 8 ho 2015. Thanks.
I have a 2004 mercury 15hp 2 stroke. I had water leaking in the head. I need a video on it
Hi super great video . I did exactly what you do in this video but my problem ... The motor still on high revolution it doesn’t go to throttle speed. Even if I unscrew the gas screw it still too high ... What could be the problem ? Thanks in advance !
will pumping fuel ball on gas line rock solid cause engine to flood out and stall?
Sam
Great tutorial but a suggestion. You have to organize your shop and keep it organized. Shelves on the outside walls, a bench, a steel table and tool organizers. You’ll find you finish projects much faster.
Nice video really helped I have a question how do you make that motor idle down so it is really quiet but not vibrate ? Is you could make a video be cool thanks
Making the motor run smooth at idle is a function of having the mixture tuned just right, and also not setting the idle too low. The motor will run at 400rpm, but vibrate and shake back and forth, it is designed to be in the 550-650rpm range, and will run quietly and smoothly there. As you adjust the idle with the screw that touches the throttle plate stop, use an infrared tachometer (a gauge that watches the flywheel turn and will tell you rpm without actually contacting the motor, about $40-75) to set the idle in the designed range. Hope that answers your question!
Do you have any videos in adjusting and setting the throttle linkage??
I have a 2013 9.9EH just like yours, my problem is it’ll start and run great for about 20 min. When I go back to idle it’ll die when warm and won’t start for about 15 min. Then it’ll do it again. I rebuilt the carbs when I got it and it wouldn’t idle right so I replaced the whole carburetor. Anyways this happened on the first outing any ideas??
Great Video, it would be good if you changed the Title to 9.9 Mercury, Tohatsu and Evinrude Caburator Cleaning/rebuild.
I've owned both, a 2004 Tohatsu 9.9 and 2017 Evinrude. The engines are almost exactly the same, all made by Tohatsu. Great motors, but carbs need regular cleaning. I think a lot more people could benefit from your video with a little title adjustment. The Tohatsu and Evinrudes don't have the accelorator pump but I can see where it would of been as the carburator casting has everything for it.
Man you need a work bench. It's killing to watch. Lol. Great job appreciated
HI, I have the same engine as you but where I connect my throttle lever from the carb to the wheel, the wheel rotates and has a decent amount of play in it without me turning the throttle. Does the nut that holds the throttle pulley need to be tightened? It means my throttle will only engage when I'm almost at full power, in both reverse and forward, making small adjustments in power pretty much impossible. Thanks!
Rowtel, I was wondering if you had any thoughts about gas octane. In the Midwest we have 10% ethanol. Someone recommended using 91 or 92. I’m wondering what your thoughts are. Thanks!
You're the best! Thank you
Thanks
@ 22:00. When putting that cover back on, I’ve discovered a small black gasket from someplace inside there. Does it (gasket) go on the bottom side of the spring where it rest in the fuel line connect, or does it sit at the top, between the plunger and the spring? Thanks.
Thanks for the thanks