oonighttrain
Seaman
- Joined
- Jan 21, 2008
- Messages
- 50
hi, i saw your past posts and it lookslike you really know your yamahas.. any help from anyone would be greatly appreciated!!!
i have a 1997 yamaha 50 hp 4 stroke that runs ok but, has very low compression on cylinder #1 (like 30 p.s.i)and slightly low compression on cylinder #4. (around 90) 2 and 3 are over 120 psi....
i removed the head to take a peek and do not see any damage whatsoever on the cylinder walls. i took the head to a machine shop so they can do
a vacuum test on each valve. im hopingthey find something wrong so i dont have to get any deeper into the engine.
thanks!!!
i have a 1997 yamaha 50 hp 4 stroke that runs ok but, has very low compression on cylinder #1 (like 30 p.s.i)and slightly low compression on cylinder #4. (around 90) 2 and 3 are over 120 psi....
i removed the head to take a peek and do not see any damage whatsoever on the cylinder walls. i took the head to a machine shop so they can do
a vacuum test on each valve. im hopingthey find something wrong so i dont have to get any deeper into the engine.
thanks!!!