Rough Operation At Mid Range RPM 2002 100 HP 4 stroke Yamaha

1gabby

Cadet
Joined
Jan 7, 2009
Messages
16
I have a friend that has a 2002 100 HP 4 Stroke Yahmaha.
This boat is run in salt water in the mid-atlantic region.

When running the boat in the 2400 to 3100 RPM range he is getting very rough operation out of the motor.

After he gets past the 3100 and up to the top end RPM it runs great.
I believe it runs fine at low RPM as well.

All fuel has been removed from the fuel tank and tank cleaned.
New fuel filters.
Installed a fuel/water seperator.

Any thoughts?
 
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