Mercury/Tohatsu Outboard Carburetor Cleaning on a 4HP/5HP/6HP 4 Stroke - Carb Removal and Cleaning
Vložit
- čas přidán 5. 07. 2021
- Quick video showing my attempt to remove and clean the carb on a Mercury 6HP 4-stroke outboard (same for Mercury/Tohatsu 4-stroke 4hp/5hp/6hp). Outboard carburetor service.
I strive to make high quality jon boat, small outboard, and small stream fishing vids.
You hitting that SUBSCRIBE button helps a lot! Thanks for the support!
Always refer to your own owner’s and service manual!
For million $$$ sponsorships (or just wanna chat) hit me up at skinnyriveroutdoors@gmail.com
Here is the video where I did EVERY MAINTENANCE item in the manual plus a carb removal and cleaning:
• EVERY MAINTENANCE ITEM...
Safety First! Make sure gas valve is closed and all gas is drained from lines in a safe manner away from all heat sources (garage heater and incandescent bulbs). Ideally entire system is drained or ran dry.
Make sure motor is secure and cannot tip over
Inspect all gas lines and carb for gas leaks after reinstalling
If you have an electric start, unhook it before working
-------
All maintenance items are the same for Mercury 4HP, 5HP and 6HP 4-stroke outboards and Tohatsu 4HP, 5HP and 6HP 4-stroke outboards.
Below are links to all MUST HAVE parts for a Jon Boat and some of my favorite items. Clicking these links help support the channel.
THANK YOU!
Quicksilver Marine 10W-30 Motor oil --- amzn.to/3JJTXdK
Oil measuring can --- amzn.to/3tIq082
Valvoline 80W-90 Lower end unit gear oil [tube] --- amzn.to/3JJU356
Quicksilver 80W-90 Lower end unit gear oil [needs a pump] --- amzn.to/3DeyUxe
Lower end unit gear oil pump --- amzn.to/35gmTLn
E3 Spark plug --- amzn.to/3uEMDKa
Replacement impeller --- amzn.to/3uvlyc9
Carb cleaner submersion --- amzn.to/3DekMEe
Carb cleaner spray --- amzn.to/3II8Prt
Anti-seize grease --- amzn.to/3JKYGff
Marine grease --- amzn.to/3JJU88U
Grease gun --- amzn.to/3iH5ezw
Fuel filter --- amzn.to/3Dj0V7a
File for prop edge repair --- amzn.to/3tLs1k9
Great Dewalt tool set --- amzn.to/3JELsAx
My camera stuff:
Camera Canon SL2 DSLR: --- amzn.to/3DhJBzp
My favorite lens Nifty 50 - 50mm f1.8 --- amzn.to/3DipuAM
Amazing Cheap Popvoice Lav mic -- amzn.to/3ILTsOK
Amazing Cheap Tripod --- amzn.to/3LhCjyf
GoPro Hero7 Black --- amzn.to/3IJnjaE
My Dream DSLR Lens Sigma 18-35mm, f1.4 --- amzn.to/36w2NgA
More Favs:
Fav lifejacket --- amzn.to/35gzGxf
Fav budget fishing reel --- amzn.to/3JNedev
Fav budget fishing rod --- amzn.to/3JOJkGk
Fav fishing line --- amzn.to/3uA7i1E
Fav fluorocarbon leader --- amzn.to/3iDMReK
Fav lure --- amzn.to/3JJJsH3
2nd fav lure --- amzn.to/36TzqVy
THANK YOU FOR THE VIEW! Above links are affiliate. Using those links helps the channel!
Amazing Music by Cullah @ Cullah.com. Also check him out on Spotify!!!
Disclaimer: Use at your own risk! SAFETY FIRST! Always read your own owner's manual, service manual and understand all safety items for your specific boat and motor. I am not an expert mechanic. All of the information I share is for entertainment purposes only. Consult your boat and motor's manufacturer, owner's manual and service manual for expert advice. Boating and repairing/maintaining a boat motor can be dangerous. Please make sure you fully understand all risk involved so you do not get injured or worse.
Once again, all content on this channel are for entertainment purposes only. Please only attempt any of the things in these videos unless you have adequate skill, have fully read the owner's manual and service manual, and even then continue at your own discretion and risk. I am not responsible for your boat, motor, and am not responsible for keeping you safe.
This video is so helpful. My son and I followed all your steps and got my motor running again thanks to you!
Awesome! I appreciate the view and support. Glad your motor is up and going again!
Great video. I am about to replace the carburator on my 5hp Tohatsu with a 6hp carb. I'm hoping to get that last 1hp boost out of it. Never having done it before, I've been searching for some instructional videos. This one details the process nicely. Thank you.
Let me know how it goes. Curious if you will notice a big jump. Sounds fun
@@Skinnyriver Hey, can I call you sometime? Do you have a website with contact info?
Thank you! I have the exact same motor and got it running again because of your excellent video.
Awesome! Good deal, glad it helped! I was nervous taking it apart but ended up being pretty simple. Thanks for the view!
you have done great job! appreciate your comments as you pointed out details as you took it apart and put it back together. you are good!
I really appreciate the comment! Thanks for the view
I had to clean my carburetor and this video helped a lot. Thank You.
Awesome, I appreciate the view. Thanks
Great video thanks for taking the time doing it and sharing. I have a gas flow issue with my own Mercury 6 hp, so I will do the exact manteinance. Greetings from Costa Rica.
thanks for the view! Good luck, let me know if you get it fixed
Great Video, thanks heaps. These look like pretty good engines. I just bought a 4hp "new" according to the owner, a few years old but never been in the water. It started when I bought it, but took it home and a week later I just couldnt get it going without choke on, and it would stall within 30 seconds every time.
Quick carb clean - it was pretty dirty - and it started first pull.
One suggestion, I unscrewed the bolt on top of the throttle linkage to release it. It came out easy and saves putting pressure on anything and bending the linkage. Just dont do it up too tight when putting it back together or you wont be able to shift your throttle. If anyone knows, id love to know the torque setting for this one.
Heres hoping I get hundreds of hours out of my new toy.
Awesome! Good point on the bolt. Yeah you should years of fun out of it!!
Very helpful, thank you from Great Britain 👍
Thanks for the view!
Thank you so much for saving me time and money 👍
Thanks for the view!
Thank you
Thank you so much! Any chance you can do a video adjusting the carb? Low idle jet and idle?
My adjustment screw has a cap on it. I’m out of warranty so I could pull the cap but I may try to get another used older motor to mess around with. If so I’ll definitely go crazy on it lol and mess with carb idle and fuel air mixture
I found that if I take the gas cap off, pressurize the gas tank with a little bit of air pressure I put my hand over the tank and blow through my fingers. It starts first pull cold. Otherwise, you do have to wait for the pulse pump only activated when you pull the cord to allow gas Into the carb.
Yeah good point, it pushes gas back through all the lines to the carb. It works..
I now hookup use an external gas tank and squeeze the bulb a few times before I leave my house to prime the system. Works too!
Hey, you said the vacuum tubes in the carburetor go to the bottom of the engine? Or do they go outside? Because on my 5HP Tohatsu there’s a hole that it may seem to be for it and the hose tip would end outside the engine through that hole.
Yeah I think it depends on the motor but my understanding is they are basically overflow hoses that make sure gas flows away from the hot motor if the carb overflows. But I am not 100% sure
Great video...What is the spring loaded screw on the linkage side of the carb, is it an idle stop? Also, is the small air filter attached to the carb replaceable or cleanable?
Yeah that screw sets idle speed, it sets the throttle valve position when tiller is at 0 throttle. That is not really a filter, it’s just a mesh screen. I believe it really is a spark arrester if the motor backfires and it keeps big contamination out but it doesn’t really filter anything. You can clean it with a wire brush.
@@Skinnyriver Thanks much....I hope to follow you alot
can you make a video about the petrol pump to understand where it is connected and how it works? do you have an external tank?
That’s a good idea. I use both internal and external. Just depends. But good vid idea. I’ll put it on the list
@@Skinnyriver 👍👍👍
You helped me clean my jet and get my 6hp started. Won't idle without choke on. Any ideas or directions? Awesome vids
There are 2 jets, the main and an idle jet. If it won’t idle without choke there are usually 2 issues. Your idle jet/circuit in the carb is still dirty or your fuel air mixture is off and the carb is not sending enough gas at idle. There is an idle speed screw (also known as fuel air mixture screw) that you can adjust. Couple questions:
Has it always done this?
Did you get it new or used?
What year is the motor?
@@Skinnyriver 2020 used 6hp. Old gas no start. Cleaned bowl, cleaned main jet. Starts and high idles now with choke. Dies if choke off. Gotta find the idle jet and work that. Also cleaned the gas tank and fuel filer
At 8:27 you mention the gaskets. I tore a few milimeters of one edge of gasket on the carb side cause it sticks out a little and caught my finger during cleaning. I got my motor running after cleaning carb jets, especially needle that controls the float. However, my engine stalls with choke fully engaged after 1-2 minutes and shakes a lot, stalls immediately with choke disengaged. You think my fuel/air mixture could be too lean due to an air leak at that gasket causing it to stall?
If it wasn’t doing this before, then I would guess the gasket is what is causing this issue. I did the same exact thing with my lawn mower carb this year. I would get another gasket (they are really cheap) replace it to rule it out
If you have to have the choke on then it’s not getting enough gas, so I think you are right that its a fuel air mixture issue
Awesome stuff man! I am going to be putting in high altitude jets soon, since I use it solely up in tahoe. I am bogging out up here in the altitude. Is there a way to change the jets without taking off everything?
Man I really don’t think so. You maybe able to just remove the carb bowl, but honestly it’s probably best to remove the carb. Let me know if the high alt jets help!
@@Skinnyriver Got the tohatsu high altitude jets installed by a mechanic, since I didn't trust myself haha. They work! totally different motor now. No bogg, dosn't burn up a bunch of oil, full range of throttle, gas smell is gone. I went from maybe hitting 6mph to actually planing out at 11-12 on my 9ft inflatable. So stoked. I have a hydrofoil that I'm gonna try to see if it gets me into plane faster, takes me about 15 sec to plane out currently.
Awesome! Glad that worked. I never knew the high altitude jets would make such a difference. But it makes sense. Really glad it worked, I know it’s frustrating when it bogs down.
Hello Sir, I need help! My hangkai/tohatsu/mercury 6hp outboard motor similar to yours is giving me some serious problems. I pulled and cleaned out the carburetor and even cleaned out the jets. Now I'm struggling with tuning the pilot jet and the mixing screw to get the motor running correctly. I turned the pilot jet all the way closed and tried to tune the idling with the pilot mixing screw. The result of this is my spark plug becoming fowled up and very sooty. Does this mean I'm running extremely rich? And what is the best setting for the pilot jet? Plus when I try to rev up the engine it coughs through the intake and backfires. Please let me know what you think I should do to fix this issue. Thanks again
If you are backfiring and fouling your spark plug you are probably too rich. The adjustment screw on Mercuries are seal (you can’t get to them per USA EPA emission regulations). But I would turn screw all the way in and then out 1 1/4 turn and start there experimenting
That black gasket on carburetor, it never came off? Between black gasket theres gray gasket also did u kept those attached? During carb cleaning?
It’s not a big deal. But I wouldn’t get carb cleaner on them (I don’t think you are supposed to get carb cleaner on rubber).
I usually remove them and wipe/clean under them but it’s not a big deal.
At around 6:15 in the video, there is a small pin lying on your shop rag near the carb bowl. Where did that come from?
Hey KD, I checked the vid again and didn’t see it. The only thing it could be was the needle that is in the float valve. I’ll double check the vid again to see if I can see it. Also on that rag is the outlet gasket, the throttle cable, a screw driver and the bowl
@@Skinnyriver Thanks.. I just didn't want to miss something. Thanks for your insanely valuable videos..
I’m looking at buying a Nissan 4hp. It sat for 3 years and we messed with it for about 5 minutes got it to turn on but it dies instantly. Hoping it just needs the carb clean before I buy it for $500
Sounds like a good deal if it’s something minor like a carb clean!
Any idea what the part is called that connects from the behind the carb, it is like a metal piece that the line that goes out of the carb goes to.
I’m not for sure, here is the parts diagram for the carb www.perfprotech.com/mercury-marine-parts-catalog/fuel-system/assembly/11768/80?model=4353
If you are talking about the fuel line, The fuel line leaves the carb and goes to the fuel filter and then the fuel pump
@@Skinnyriver thanks but I figured it out, intake manifold
Great video and super helpful. How important is it to change the gaskets ? As mine look ok I’ve taken them off whilst soaking the carby. Can I reuse them and maybe put some gasket glue as well? Appreciate your thoughts
Best case is to replace if you have an older motor but I reused mine as long as they look in good shape and not ripped or cracking. I don’t know about gasket glue, I am aways scared to use that around the carb.
So I’ve followed exactly the same method and had now put it all back together. When I start it, it’s revving quite high. Not sure if this is normal for a short time, I ran it for 3-4 minutes. Any ideas would be greatly appreciated.
@robg9412 that’s never happened to me. Double check to make sure the throttle lever is closing all of the way. Maybe something happened with the throttle cable/metal linkage that is keeping the throttle open on the carb
Any idea why it might be idling so high?
@@Skinnyriver thanks I think it’s cause I took the screw off to remove the link originally so it might’ve moved the cable when I put it back.
Bro do you know the standard settings for the carb mixture screws?
I don’t, thinking it’s 2.5 turns from closed but not sure
Looks like i am continuing to flood on start. I ran SeaFoam like you suggested but looks like i have to go the jet cleaning route. Great video on step by step cleaning jets. If the float appears operating should i also take the float needle out and clean it & chamber or is that too risky for a rookie?
I would just spray the needle and where it seats/closes to flush out any dirt. Here is another video with some better closeups on the need valve and jets czcams.com/video/WwRhvIakiIo/video.html
Be careful though the needle valve just sits in a little groove so it’s easy to fall out
Thanks & much appreciated,,,,
Well, i cleaned carb & reassembled but no luck on start...Gotta be fuel...I have an internal tank so priming might be an issue. I discounted fuel pump because it started before carb take down....thoughts?
I remember you said it would only idle with choke on. When did the starting issue begin? Was it after you tried or took something a part? Also what year is it? The main things (other than the carb) it can be:
1) Fuel supply (most likely) dirty fuel filter, fuel pump, something going on with your tank/lines, gas cap vent stopped up, gas valve stopped up
I would try to get my hands on an external tank and try that
2) No spark
3) emergency stop lanyard is not in all the way or the circuit has a short
There are some videos showing you can take the drain screw out of the carb bowl, hold small bottle at the drain and pull the pull cord a few times. If you get fuel coming out of the drain you are getting gas and your fuel pump is good. I haven’t done it but see if you can find one of those videos.
@@Skinnyriver Success on start & i really appreciate your guideance....No start after carb clean led me to troubleshoot fuel. Ended up w/ priming the carb as my main issue. Internal tank has no way to prime w/ pump so ended up putting more gas in tank & blowing in top of tank (sealing as best i could w/ rag). Made sure carb bowl had fuel & low & behold it started and ran just fine.....Idle is still rough & i think that pilot mix springed screw on the motor side of the carb may need more than 1 1/2 turns to get a little more air.....thoughts? Thanks again for all of your help..
How do i drain the carb bowl on this engine? Is it the black screw seen at 1:14?
Yeah that’s it!!
@@Skinnyriver Thank you! 😁
Hey, quick question.
So I bout a 2019 4hp 4 stroke Tohatsu motor. I’m having issues starting it. It starts and only stays on when I spray starter fluid through the air intake, once I stop spraying it the motor stops. There is fuel getting all the way to the carb because I did process of elimination. I maybe thought the fuel filter was bad so I took the fuel filter off and connected the hose from the fuel pump and the hose that feeds into the carb, runs fine, but then I’ll put the fuel filter back on and connect the hoses and motor won’t run… I’m a little confused. Any help?
Get new fuel filter, if you use internal tank fill gas tank all the way, open gas valve, let it sit for 10 mins to let gravity fill all lines with gas, should start in 3 pulls. If it doesn’t then you need to clean the carb.
Hey I cleaned the carb, toook it all apart put a new filter on it and still nothing.
Oh ok thought you mentioned it ran without fuel filter. That obviously points to fuel filter stopping flow. If it starts with starting fluid they it has to be a gas problem (either bad gas or gas supply). If you are getting fuel to the carb then it has to be a carb issue. My initial thought is you may have a fuel pump issue and you are not sending enough fuel to the carb.
Are you using an internal tank or external? I would change to the other to rule out gas flow from tank issue.
But if you are 100% sure you are getting really good gas flow to the carb (not just filling up the carb bowl but keeping it full) then it’s a carb issue.
If your gas flow is not sufficient it’s either fuel pump, fuel filter, clog/kink somewhere, or an issue with your fuel tank priming bulb, venting, etc
This is an awesome vid on checking gas flow to the carb bowl czcams.com/video/8GJxpXfakP4/video.html
@@Skinnyriver ok thank you very much, I will take your tips and see what I can do. Thank you for helping me out I appreciate it very much
Mercury,Tohatsu nd Mariner...they r identical triplets,excepting the cover's marks.
Yeah all made at the Tohatsu factory in Japan and rebranded
is it possible to get a used (correct) carburetor for a Mercury 3.5. Perhaps one of the followers of the channel has something to offer. Thanks
I’ve bought a few off eBay but they weren’t original manufacturer, but they worked great
@@Skinnyriver do You have a link for store on ebay?
Sorry I just bought them off different people on eBay. Look up the carb part number # and throw that into eBay search I bet there will be a bunch
@@Skinnyriver Thanks! What was their price?
$45
Did you clean the intake screen (air filter). Does anyone clean these screens. Seems rediculous there’s no air filter? Why??
Yeah I was wondering about the air filter as well. Found out that most outboards don’t have air filters simply due to lakes being must cleaner (less dust and debris than your yard (mowing) or on the road. I read The mesh is a flame arrestor (I think) and can help the air be uniformed going into the carb. It’s not a filter at all so it doesn’t need cleaning for air flow but maybe hit it gently with a metal brush if it gets cruded to help with spark/flame arresting
@@Skinnyriver air is being sucked in there. Spark arrestors are screens located in the exhaust tail pipe area. This intake screen is not a spark arrestor. It could get dirty/ dusty and decrease airflow causing engine to starve. I’m gonna remove mine and clean with compressed air. My honda 5hp is 36 years old. Wont hurt to clean it I guess. Thanks
@@Skinnyriver air is being sucked in there. Spark arrestors are screens located in the exhaust tail pipe area. This intake screen is not a spark arrestor. It could get dirty/ dusty and decrease airflow causing engine to starve. I’m gonna remove mine and clean with compressed air. My honda 5hp is 36 years old. Wont hurt to clean it I guess. Thanks
It’s called a backfire
It s almost impossible for me to take out the main nozzle without to spoil it a bit...for example even today I spoiled it nd no success to take it out...so,I was forced to clean the carb just like that...
Every time I have problems with this carbs!
Greetings from Europe!
is this different to a 2stroke
It should be really similar
You put the bowl on backwards, 😮 the drain plug goes to the outside.
Lol yeah Im a genius, went to drain it and couldn’t lol. I notice it at minute 13 in the video
Can i please buy you new flatheads 🙏
Of course, venmo me $20 and I’ll get a new set! I may or may not have used mine as punches and chisels before