I'm not a mechanic but I had a similar problem with the motor on my bass boat.
It turned out to be the carbs but they initially thought it was the stator.
Evidently there are low and high speed windings. I hope this isn't the case
since they are big bucks to replace!

Dan


Nick VanderWal wrote:

Got a Yamaha 90hp 97 mod used a few years ago. It runs rough at low end
through mid range. Last two seasons I have taken it to a shop where the
mechanic soaks the carburators. Guy says that it is a mystery to him that it
keeps doing it and says he has never had one act quite like this before. He
has been out on a water test and says it sounds like it is dropping one of
the cylinders. I see on the Yamaha home site that there are carburator
repair kits available. Are there any Yamaha mechanics on here that think a
repair kit for each of the three carburators is going to accomplish any more
than soaking the carbs? Thanks for any advise. NV