Tohatsu 6hp carb rebuild - need help

[ZZ13]

the carb rebuild kit just comes with new float, needle, hinge pin and a small o-ring. I have no idea where the o-ring goes. Anyone know. Here are pics with float at installed and removed.

 

[skolbe]

I had issues trying to rebuild mine, (6hp as well) so I just replaced the carburetor. I have the old one still. Sorry I am no help.

 

[NotHerDecision]

looks like it goes right around the center nozzle. Can you remove the brass part with a flat blade? Think the O ring is there based on your pic.

Josh

 

[RollerCoastr]

I thought I'd nail this one out of the park - I had my carb apart so many times over the years...

Yes, the main nozzle comes out, and so does the pilot jet, but if you only have 1 0-ring, I don't remember where it goes.

I rebuilt, soaked, sprayed, wired-out, kicked, cursed... They're picking little guys and sometimes no matter how clean you think you have it, it might still stall at idle. There's a point where a whole new carb is just worth it.

 

[ZZ13]

Found it! It's for the bowl drain plug on the bottom side of the carb. I am replacing spark plug, fuel filter, rebuilt carb (not many new parts), sprayed every jet and port liberally with carb cleaner, and took apart and cleaned the fuel pump. My problem is it will start but give it any throttle and it stalls. Except for once in a blue moon it runs for about a minute with throttle.


By the way, if you change the impeller and put the plate in upside down, the guide holes don't line up and this happens if you stubbornly just crank down the bolts. Ask me how I know.

 

[ZZ13]

Just test ran it. I think it's fixed.

 

[NotHerDecision]

Great news!

 

[ZZ13]

Yup, Josh. Could have been any of the three I guess (fuel filter, carb, spark plug). I essentially gave the motor a full scale tune-up and cleansing. It's about 5 years old I think (second owner), so bad stuff from salt was probably getting ready to happen.

 

[ZZ13]

I thought I'd nail this one out of the park - I had my carb apart so many times over the years...

Yes, the main nozzle comes out, and so does the pilot jet, but if you only have 1 0-ring, I don't remember where it goes.

I rebuilt, soaked, sprayed, wired-out, kicked, cursed... They're picking little guys and sometimes no matter how clean you think you have it, it might still stall at idle. There's a point where a whole new carb is just worth it.

Is the main nozzle the long one in the middle under the screw top? With a bunch of little holes all down it's length and two big holes at the top? Got it out and sprayed the heck out of it.

What's the pilot jet? Is that the one that unscrews from the outside and has four medium sized holes along its length? Cleaned that one too.

 

[RollerCoastr]

yes on both counts. Clearly, well-done!

 

[ZZ13]

Thanks. I just looked up the parts and Tohatsu calls that main jet the "slow jet", I guess because its used for idle. They call the air adjustment screw the "pilot screw". I didn't touch that thing. Was afraid I'd mess up the mixture and never get it back correctly.

 

[RollerCoastr]

I use the Merc terms, which may be different. Same engine though. So is the Nissan (which might call them different things also?!)

On mine, the pilot screw had a brass or copper cap on it. I've actually read that messing with it can help running, but hurts emissions.