15 hp johnson need help!!!!!

[awilkinson]

i have a 76 i believe johnson and it will not keep an idle or even start without a little help of starting fluid once i get it started on the top end it runs good as soon as i idle down it dies have played with the slow speed adjustment with no avail. cleaned the carb blew out all the ports no help put on a new fuel pump didnt help.all the gasket look good no flaking the carb is clean what can i do.

thanks for any information

oh yeah the idle adjustment are maxed out

 

[awilkinson]

Re: 15 hp johnson need help!!!!!

sorry didnt see the (not engine topics)

 

[David Greer]

Re: 15 hp johnson need help!!!!!

don't use starter fluid (like hotshot) on a 2-stroke. Too hot and no oil.

 

[Boatist]

Re: 15 hp johnson need help!!!!!

I would check the compression of both cylinders and then I would run some OMC Engine Tuner thru the motor. Make sure you have a new set of plugs to put in afterwards. When I do my engine I put in a old set of plugs first then run the omc engine tuner. After all done and all the carbon out of the engine then I put in a new set of plugs.

On my motor it made a big difference in the idle speed. I also had a weak coil on one cylinder.

Also check your Points and timing for both cylinders.

 

[freddyray21]

Re: 15 hp johnson need help!!!!!

sounds like a dirty carb or an air leak. did you take the carb apart and soak it then blow out all the passages?