Nissan/Tohatsu 8B starts, dies quickly, difficult to restart

[Sailfisher]

I have a 20+ year old Nissan 8B (2 stroke obviously). When the engine is cold (not running for a couple of hours) it will start immediately with the choke pulled fully out. Then need to push choke in quickly and throttle up to keep it running. After that it will run for 10 to 20 seconds at moderate to high speed (need to keep throttle open), then dies no matter what the throttle position (choke is in, no choke). CANNOT KEEP IT RUNNING with any combination of choke or throttle.

HERE is the wierd part.............
Will only restart after many pulls with the choke in (no choke). After several pulls it will pop once or twice and then run a little bit longer on each succesive pull until it catches sufficiently to allow throttling up. ACTS LIKE IT IS FLOODED! When it does restart there is lots of smoke and rough running for a few seconds (Again it is acting like it was flooded). After the smoke clears it will continue to run at moderate speed but will die at idle until it has warmed up considerably. After warmup runs like a champ and restarts easily and continues to idle without any choke!

Have fresh fuel, carb has recently been cleaned, going nuts trying to figure this out!

 

[TOHATSU GURU]

Re: Nissan/Tohatsu 8B starts, dies quickly, difficult to restart

Bet it's still a carb cleaning issue.

 

[Sailfisher]

Re: Nissan/Tohatsu 8B starts, dies quickly, difficult to restart

Bet it's still a carb cleaning issue.

Hey Elvin, you still around? Just ran across this 18 month old post. Thought I would let you know that you were 100% correct. After I had the carb professionally cleaned the old girl started and ran like a top. Unfortunately I am having to have this cleaning done about every 10 hours or so. Might be the gas they sell here in Ecuador. This 20+ year old Nissan still gets up and goes. Thanks for the help

 

[Sea Rider]

Re: Nissan/Tohatsu 8B starts, dies quickly, difficult to restart

Ecuador should have good quality gasoline available, buy the top premium you can find at service stations, engine should run much better if you been using the cheaper one. What are you finding inside carb to have it dismantled every 10 worked hours, fuel debris ? Is your tank, fuel filters immaculate clean ? How is your fuel line connector's internal o'rings, probably dried/hardened ? 20 years is a lot, have you ever changed a head gasket ? Probably dried and hardened as well...

Happy Boating

 

[TOHATSU GURU]

Re: Nissan/Tohatsu 8B starts, dies quickly, difficult to restart

Just run the fuel out of the engine after each use...And use the choke at the end to pull the residual fuel into the engine so that you get an empty bowl.