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Califbill

wrote:
On Thu, 11 Dec 2014 22:56:37 -0800 (PST), wrote:

Hi
I have Yamaha outboard 2 stroke motor (250 hp, model 1996). My issue
with this motor that when I accelerate the speed control at a certain
speed the RPM varies up and down it self. can somebody help me to solve this issue.

Sounds like a fuel delivery issue. Are your filters fresh? Does it
smooth out if you squeeze the ball?
If you have another fuel line and a portable tank you can eliminate
all of the "boat side" fuel system problems. There is a chance you
have a bad fuel line. There are some styles that had an inner liner
that collapses and blocks the flow.

My yamaha 4 stroke did that and was a dirty jet in the carb.