Russell Huish
Cadet
- Joined
- Jan 22, 2010
- Messages
- 11
Re: Johnson 1969, 20hp won't start
Hi, this looks set to become the longest thread ever! Well couldn't get KR oil here in England but used the gas/oil mix, left 12 hours, took off covers and noted cylinders not scored. Sprayed rings with wd 40 and they moved in their grooves when pushed lightly with screwdriver. Stuck all back together but put petrol pump on top cylinder as easier to get at (will this matter?). Got 100 psi top cylinder and 95psi bottom cylinder but still wouldn't run. I know you advise against it but I sprayed some easy start in the plug holes and the engine ran for about two seconds. Tried few more times and found engine would run if sprayed in just top cylinder but would only get large backfire if sprayed in bottom cylinder! Also when sprayed in top cylinder the engine pulled easy, no flywheel lag. After much thought ( this is the third head gasket) I decided to pull the head. Here is the strange thing, water was in the bottom cylinder but no cracks in gasket and head was torqued as per manual specs. Also if I spin the flywheel with leg in tub the cylinder seems to get wet as the piston rises as if it is pulling water up with it. The top cylider stays dry. This would seem to expalin non starting, why it won't run on one etc. But stumped, again?
Hi, this looks set to become the longest thread ever! Well couldn't get KR oil here in England but used the gas/oil mix, left 12 hours, took off covers and noted cylinders not scored. Sprayed rings with wd 40 and they moved in their grooves when pushed lightly with screwdriver. Stuck all back together but put petrol pump on top cylinder as easier to get at (will this matter?). Got 100 psi top cylinder and 95psi bottom cylinder but still wouldn't run. I know you advise against it but I sprayed some easy start in the plug holes and the engine ran for about two seconds. Tried few more times and found engine would run if sprayed in just top cylinder but would only get large backfire if sprayed in bottom cylinder! Also when sprayed in top cylinder the engine pulled easy, no flywheel lag. After much thought ( this is the third head gasket) I decided to pull the head. Here is the strange thing, water was in the bottom cylinder but no cracks in gasket and head was torqued as per manual specs. Also if I spin the flywheel with leg in tub the cylinder seems to get wet as the piston rises as if it is pulling water up with it. The top cylider stays dry. This would seem to expalin non starting, why it won't run on one etc. But stumped, again?
