Misfire at wot Yamaha 700 motor

aliasjerk

Recruit
Joined
Jul 21, 2012
Messages
2
New pwc owner, I have a 1994 Yamaha wave runner 3gp. It runs great for the first 15-20 minutes on the water, gives wide open throttle and all no problem. But after about 20 minutes it starts to sputter/misfire at anything above 3/4 throttle. The longer I run it the worse it gets. I have already tried replacing the spark plugs and adjusting the carb on the high speed screw but have gotten no change in the way it behaves. I am new to these types of motors. Anybody know what is common to cause such an issue? I would love to be able to enjoy it a couple more times before the end of the summer.

Greatly appreciate the expertise.
 
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