Lazy Cylinder on Yamaha 150?

[jasonalden]

Re: Lazy Cylinder on Yamaha 150?

great idea!<br /><br />I found this online at the local libray (closest match):<br />Seloc Suzuki outboards : 1988-99 repair manual : 2-225 horsepower, 1-4 cylinder /<br /><br />But I have a Yamaha.. I wonder if it would be close...hummmm. may have to give it a try...

 

[jasonalden]

Re: Lazy Cylinder on Yamaha 150?

I just replaced the fuel pumps: No change in idle or < 3000RPM behavior at the dock. Will test down the river in a little while.<br /><br />Did notice one thing I did not point out before: I have 3 carbs and on my top one, there is a strong suction. The middle carb has medium suction. The bottom carb has very little suction. Not sure what all this means. Seems like they should all have equal suction.<br /><br />I found a repair book [thanks for the library idea RODBOLT] up to year 88 [9 years older than MY engine] and I would have to say that rebuilding the carb looks VERY intimidating [let alone rebuilding 3 of them]...and then having to sync the carbs to the ignition....ugggggg. If the actual procedure for my 97 is anything like the 88, then that stinks!<br /><br />I purchased 3 carb rebuild kits [$45 X 3].<br />Dealer wants $300 parts & labor for clean & rebuild of all 3 carbs. He said I will burn up the engine if I don't sync it properly. May spend the $300 but still not sure if DIRTY CARBS are the problem????<br /><br />Hope ya'll are having a good weekend.

 

[jasonalden]

Re: Lazy Cylinder on Yamaha 150?

Just took it out for a test run. It still runs rough up to 3000RPM. Ran at WOT (5000RPM) for a minute or two and then engine ran smooth from idle to WOT, thereafter. It was only after I shut the engine off for 10 minutes or more does it run rough under 3000RPM.<br /><br />Next, I purchased and put in the fuel tank:<br />3-12oz Super Tech Fuel Injector & Carburetor Cleaner 074509733578.<br />1-12oz Super Tech Gas Treatment 074509733615.<br /><br />I wonder if I should disconnect the lower carb fuel intake line and put some compressed air through it.