Repsolboy1
New member
Hey Guys,
Looking for some advice and what to look for.
96 Yamaha 2 stroke 30 hp with 3 cylinders is running well with new spark plugs. After 2-3 weeks or approx 10 hours of run time, cylinder 1 and 3 plugs are getting wet fouled (black deposits) and engine is losing power. I am using spark plugs specified in the manual. Set up a tiny tach and cylinder 2 is showing WOT 4200 RPM, but 1 and 3 are only reaching 2000 RPM at WOT. Compression is 120 on all 3 cylinders.
Any help would be much appreciated.
Looking for some advice and what to look for.
96 Yamaha 2 stroke 30 hp with 3 cylinders is running well with new spark plugs. After 2-3 weeks or approx 10 hours of run time, cylinder 1 and 3 plugs are getting wet fouled (black deposits) and engine is losing power. I am using spark plugs specified in the manual. Set up a tiny tach and cylinder 2 is showing WOT 4200 RPM, but 1 and 3 are only reaching 2000 RPM at WOT. Compression is 120 on all 3 cylinders.
Any help would be much appreciated.