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  1. S

    2003 yamaha 90 4 stroke hesitation at mid throttle

    Hello Have a 2003 90hp 4 stroke. Have had the carbs cleaned and synchronized. Still have a hesitation/ stumble between 2000 and 3000 RPM. Starts and idles great. Gas is new, 91 octane. primer bulb stays firm- no air leaks in hose. above 3000RPM it takes off full power. Im wondering if the...
  2. S

    Yamaha Tachometer testing on Alumacraft TP 17.5 2003

    Hello, have an alumacraft TP 17.5 2003 with yamaha 90hp. its a F90TLRB. how do i test the signal wire for the tachometer? use AC voltage? what should it be at roughly 1000 RPM? i put a new tach on it. it showed 1000 RPM for 30 seconds or so and went to zero. I have not been able to get it to do...
  3. S

    1999 Mariner 50hp 4 stroke linkage help.

    Hi guys, working on this motor for a friend. I think the roller that rides on the Auto start linkage is on the wrong side. The little white roller falls off and drops, gets stuck on the left side of the linkage. I have the service manual but I don’t see where this can be adjusted.
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