yahmaha 200 4 stroke

[drillem]

Got out and ran the boat on this past weekend, motor idled good and ran good until about 4000 RPM. IF you went full throttle, or about 4200 - 4300 RPM the motor would loose power. It acts like it is not getting enough fuel. Fuel pump and o-rings were changed about 7-8 months ago. Any Ideas what could be causing this?

[jpeff31787]

i'm no mechanic and don't really no mechanical details, but I'd say you are probably right with the not getting enough fuel. Have you been using ethanol free fuel, adding fuel stabilizers?

May sound funny, but did it rev up to higher rpms in reverse or neutral? I did have a problem like this before and something in my carborators (sp?) had broke and needed replacing. Wasn't as expensive as it sounds though, but that was all on a 50hp Johnson lol

[drillem]

Yes we have been using ethanol free fuel. That was what caused the fuel pump and other things to be replaced.

Could it possibly be something clogging up the Fuel Injector?

I am no mechanic at all as well.

[jpeff31787]

Originally Posted by drillem

Yes we have been using ethanol free fuel. That was what caused the fuel pump and other things to be replaced.

Could it possibly be something clogging up the Fuel Injector?

I am no mechanic at all as well.

Sounds like a possibility to me! lol Try posting this on thehulltruth.com, there's a bunch of mechanically inclined people on there. You could probably just do a search and find your answer on there

[DA COVE]

When was the last time you ran it?

[drillem]

About a month ago. It did the same thing, just not as bad.

[Dink]

Cracked fuel line or bulb will do it

[DA COVE]

Originally Posted by Dink

Cracked fuel line or bulb will do it

Yep.

[swamp snorkler]

Check into what Dink said, could be your bulb is not holding a prime, definitley a motor not getting enough fuel issue.

[Kenner18]

Did they change all the fuel filters when they replaced the fuel pump ? If not that could be your problem . As well as a bad fuel line or primer bulb ,or clogged injectors .

[drillem]

yes the filter was changed. I am going to try and change out the fuel lines and see if that helps. Thanks for the info/help.