bassboy416
Petty Officer 3rd Class
- Joined
- Jul 9, 2013
- Messages
- 79
Heres the most brief recap I can give:
Bought a 1976 chysler 120hp outboard (2 stroke)
Previous owner said engine always ran great until the last time he took it out but that he replaced spark plugs and they were old and fixed problem.
I took boat out and it didn't like to shift into gear without dying unless I gave it some gas when I shifted. It ran great though other than that. Had plenty of power, got on plane no problem, towed me on a wakeboard, generally kicked ***.
Got home. Read plugs. Top two plugs were white, bottom two were brown, slightly black. Got worried that it was going to burn piston because plugs were electrode plugs and manual suggested surface gap. Replaced plugs with SG and ran in bucket at home. Engine sneezed like crazy with backfires all the time. Put the old plugs back in. Engine started and idled fine for up to 5 min but then backfired REALLY HARD out the exhaust and died. Did a compression test with engine cold and no starter. Used a makeshift pull cord and got 140-150psi out the top two and 125-130 out the bottom. keep in mind. Engine was not warmed up and starter was not used at all. Top two were the pistons I was worried about from running lean. Whats the next step?????? Carb Rebuild?
Bought a 1976 chysler 120hp outboard (2 stroke)
Previous owner said engine always ran great until the last time he took it out but that he replaced spark plugs and they were old and fixed problem.
I took boat out and it didn't like to shift into gear without dying unless I gave it some gas when I shifted. It ran great though other than that. Had plenty of power, got on plane no problem, towed me on a wakeboard, generally kicked ***.
Got home. Read plugs. Top two plugs were white, bottom two were brown, slightly black. Got worried that it was going to burn piston because plugs were electrode plugs and manual suggested surface gap. Replaced plugs with SG and ran in bucket at home. Engine sneezed like crazy with backfires all the time. Put the old plugs back in. Engine started and idled fine for up to 5 min but then backfired REALLY HARD out the exhaust and died. Did a compression test with engine cold and no starter. Used a makeshift pull cord and got 140-150psi out the top two and 125-130 out the bottom. keep in mind. Engine was not warmed up and starter was not used at all. Top two were the pistons I was worried about from running lean. Whats the next step?????? Carb Rebuild?