rpm fluctuations

by bill
(brsndon, mississippi, rankin)

I own a Yahama 115 outboard. about 130 hours on motor and about 10 years old. The last trip out motor rpms fluctuated greatly until motor warmed up and then no more. While running at idle the other day, I noticed that rpms would jump every 10 to 15 seconds and then immediately return to normal. any thoughts?

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