1989 Yamaha 30hp 2cyl rough 2k rpm range

River Explorer

Seaman Apprentice
Joined
Sep 5, 2016
Messages
44
I have owned this motor for a while now. I maliciously keep the carb (single) clean and do routine checks. It has all fresh plugs cylinders have 90psi (a little low). The cly walls have no scoring and the pistons are clean enough to eat off of. Im using 50:1 mix and 93 octane gas. Around 2k rpm the motor starts acting like its missing. when I get above that to wot it runs great. Its not very responsive at all around the mid range. One thing I have no clue about is timing for an outboard and wondered if that could be a area to have checked. Im probably going to take it in soon. Just seeing if someone else knew of this happening. Thanks Yall!
 
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