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1993 Yamaha 150 question


New Member
Aug 1, 2012
Concord, CA
Went out fishing last Saturday for the first time since March. I know, that 's bad! Anyway, while running around through out the day I noticed my big motor was "pulsing" in terms of power as I was going from spot to spot. By pulsing, I mean you could feel the boat speed up then slow down slighty. RPM's stayed the same. Have never noticed this before. Nothing real dramatic but I noticed it. Was using a fresh tank of gas. It's a 1993 Yamaha 150. Any thoughts on what it could be? Motor started and seemed to be running fine other wise.