1989 Yamaha 150 ETXF has no high end. Can I remove Main Jets w/o dropping carbs?

StamfordRob

Cadet
Joined
Mar 12, 2010
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9
All.

I just put my boat in the water and ran it WOT and it hit 3600 then quickly leveled off below 2000 rpm. It died at one point as well but I am able to putter around at half throttle. I checked the primer ball and it gets hard when pumped and stays there. The rest of the lines are new including the tank.

I also ran on a portable tank and it happened the same way. I was told that they high end jets are clogged. I see from diagrams that I have the Main Jets looking right at me when the cover is off. Are these the same jets? If so can i clean them w/o removing the carbs. At this point I'd rather clean them best I can and operate on the carbs this November. I had a late start with the new tank going in.

Thanks in advance.

Rob
 
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