no power, very low rpms

[dansys3]

Originally posted by dansys3:<br />1971 johnson 55 hp<br /><br />boat idles and runs fine at half throttle, when pushed to full or near full throttle it loses power and eventually craps out. it will restart like nothing wrong happened. I'm guessing the fuel pump, any ideas are definately apprciated. <br />--------------------------------------------------------------------------------<br /><br />OK, I changed all the fuel hoses, engine is not getting hot, changed lower unit oil to type "C", I'm still not getting any RPM's. Al suggestions are welcome.

 

[Cricket Too]

Re: no power, very low rpms

Carbs. Pull them off, soak them, blow them out with compressed air and put kits in them. Re-install and do a link and synch. High speed circuit is clogged in one or all.

 

[dansys3]

Re: no power, very low rpms

If I got some gumout and ran it through the fuel <br />system do you think that wiil improve power until the end of the season. Will that damage any parts?

 

[Solittle]

Re: no power, very low rpms

Dan - I don't think that the gum out, by itself, will harm anything _---_I also doubt that it will do any good. Continued running without solving the problem may hurt the engine though. 2 cycle engines need clean fuel in metered quantities to run. You can burn a piston if the mixture is too lean and coke the rings if it is too rich. Cricket has the solution and it is not that big a deal.

 

[dansys3]

Re: no power, very low rpms

could you give me a little more info on the "cricket" response. I don't get a hit on a search.

 

[Goodoleboy]

Re: no power, very low rpms

You will have to remove carburators from intake manifold.<br /><br />Disasemble carbs and clean with engine tuner and be sure to remove welch plugs.<br /><br />Use sharp tiped punch or even a nail will work. Just pierce and pry out. Dont try to drive punch very deep, Or you could damage carb. <br /><br />Blow all passages clear with compressed air. Re assembele useing new needle and seats and double check float setting.<br /><br /> And install new welch plug useing a small amount of gasket sealer around outside edge. Set in place with flat tiped punch of about 1/4 dia. Not a hard blow like driveing nails. But sharp quick rap.<br /><br />Reinstall carbs to intake manifold useing new gaskets.<br /><br />This may sound complicated to do, But its not at all difficult.<br /><br />Good luck!