Re: 1962 Johnson JW won’t run

[vintageoutboardman]

Thanks for your replies!

Some things I forgot to mention:
– The carb is getting enough fuel, the gas even drips from the carb (it’s flooding). That was the reason I checked again for spark, because it didn’t seem to burn all fuel from the carb.
– When I tried running it in the test tank I did take the air box off.
– Sometimes it would start (after 50 times pulling) and run for about 30 seconds, only at full throttle. Then, when it died, it didn’t start up for another 50 pulls. Even if I sprayed starting fluid in the intake it didn’t fire. This makes me think the problem can’t be the fuel system.

I took the exhaust cover off and both pistons looked to be in nice shape. The upper piston has some really light scoring, but I’ve seen that on almost every upper piston in my old outboards. I tried to move the rings, but they didn’t move. I also find the rings really tight in the piston and I doubt if there (if the rings are not stuck) would be any free space in the ring grooves for the rings to move. I sprayed some WD40 directly on the rings to soke them, but I didn’t see any carbon build up around the rings.
My compression tester is pretty accurate I think. On other old outboards and lawn mowers I get normal/correct readings…