Engine idles good but won't exceed certain RPM

[JB40jet]

I have a 40 horse evinrude jet. Model E50JERE. It has always run great until the last time out. Currently, it starts great, and idles fine, but the motor won't break loose to accelerate. At times, it won't let the RPMs rise. When you give it more throttle it bucks and hesitates. Periodically it will run wonderfly, but most of the time it acted up on the last time out. It seems that if I let it sit for an hour it will run great as long as I dont let it idle at all, as soon as it idled it would go back to bucking with more throttle. It pumps water, so I dont think its overheating, and I used the same oil mixture as always. Any ideas? Thanks.

 

[tashasdaddy]

Re: Engine idles good but won't exceed certain RPM

what have you done to trouble shoot. have you checked spark on both cylinders, compression, both cylinders, is it getting fuel to the carbs?

 

[JB40jet]

Re: Engine idles good but won't exceed certain RPM

Haven't checked the compression because I dont have the tools. Both plugs are firing. When we checked the plugs both were pretty wet. At one time over the weekend we thought the choke or electric primer was stuck. We disconnected the primer wire, but still no luck. It's like the engin is getting too much fuel and drowning itself perhaps. We think it might be a mionor issue since periodically it ran perfectly. I really don't know though.