This past weekend was out on my 255 Sea Pro with twin 2004 F150 with 140 hours. Coming back in the port engine would not sync with the starbd engine. I could not get the RPMs from the port engine even wide open. If I backed down the stbd to match the port which was around 3500rpm the struggling port engine would continue to drop RPM. If I backed off the throttle on the Port engine then hammerd it wide open I could get it up to 4300 but then would drop right back off to around 3500 at WOT. Does anyone have any suggestions of what could be the problem???
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Yamaha F150 RPM problems
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Might be a restriction in the fuel going to that engine. Fuel bulb staying hard? Could try running off of a portable tank with a new line as a test. Then check the 10 micron and undercowl filters. Have you taken a sample from the VST?
Post back and let us know.Stanley Islander 19, 2006 Yamaha F150TLRC. Ottawa, Canada
16' York River, 1986 Yamaha PRO 50.
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