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My yamaha 50 hp two stroke started up and ran just fine two weeks ago. This weekend, it started fine, idled fine, ran at low throttle fine. I could not get it past 3000 rpm. When I put the controls u wide open, I could feel the boat surge to full throttle for a few seconds, but then settle back to 3000 rpm. I changed the fuel seperator and ran fine. Hopped in the boat later and same thing. Low speed/idle works fine. Can't get high throttle/RPMs. Changed all the gas and no difference. Dropped it off at the marina and he is not sure what is wrong yet. Any ideas?
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I will take a guess since no testing was done
Fuel pump -
Is there an easy way to test if the fuel pump works?Comment
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Remove fuel pump with 2-10mm hex bolts, leave fuel hoses hooked up, pump primer bulb and check for any fuel leaking out of small hole/port on back of pump....there should be none. Not a bad idea to replace this pump every few years(or hopefully before it fails)....just like with the water pump....Comment
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Besides the fuel pump, are there other potential causes?
By the way, I pumped the bulb and the engine RPM did not change. Does that mean that it likey is not the fuel pump?Comment
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