Hey guys, just bought a Yamaha 4hp outboard in supposedly "running" condition.
It will not start, has a good spark, tried Aerostart, wont even fire.
Compession tester shows around 40 psi when I'm pulling the starter cord by hand.
I know this is too low, I am a retired mechanic and know how engines work.
My guess is either, blocked exhaust, faulty reed valve, or worn rings, maybe from overheating.
Anyone with experience care to make a guess?
The motor appears to have had very little use, no corrosion anywhere, prop has hardly lost any paint.
Any tips would be greatly appreciated.
I would like to share some of my experiences fixing Yamahas
It will not start, has a good spark, tried Aerostart, wont even fire.
Compession tester shows around 40 psi when I'm pulling the starter cord by hand.
I know this is too low, I am a retired mechanic and know how engines work.
My guess is either, blocked exhaust, faulty reed valve, or worn rings, maybe from overheating.
Anyone with experience care to make a guess?
The motor appears to have had very little use, no corrosion anywhere, prop has hardly lost any paint.
Any tips would be greatly appreciated.
I would like to share some of my experiences fixing Yamahas
