4500 rpms is all shes do
hi everyone i bought this 1994 cc 20 wellcraft with a 1994 150 yamaha did not water test ran only with earmuff and it sounded great 1st lake run about 4500 rpms with 15x17 prop could trim out to 4800 but bow was really bouncing . i changed props to 15x 15 same e xact thing no change what so ever . the throttle opens the carbs. fullly open at 3/4 throttle and no increase at full throttle. i checked coils to the sparks plugs it has a blue spark on all plugs the plugs appear to be black and a little oily with only 3 lake trips and a half dozen earmuff flushing. the motor idles perfect compression on all cylinders around 118 with no leakdown, good out of hole shot ,run find other than what i stated , my specs. for this motor states rpm range 4500-5500- my prop man believes it should top out closer to 5500 with on 1 person aboard, can anyone clue me in on what i maybe missing here before i take her to a yamaha service dept. i never had a yamaha but have had other motor and in pass full throttles u got max. rpm there thanks
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