Number one cylinder on cub

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Number one cylinder on cub

Postby Tiller1940 » Sun Sep 13, 2015 4:56 pm

I have my cub apart because later this week I am converting it to 12 volt from 6 volt I was checking compression on the cylinders the number one cylinder has little to no compression the other 3 have fairly strong compression what causes no compression? I don't have a tester I just put my thumb over the whole and cranked it.

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Re: Number one cylinder on cub

Postby ScottyD'sdad » Sun Sep 13, 2015 5:08 pm

Valves needing attention, or worn piston rings. Since it's low in one, I'd suspect a sticking valve. Remove the valve cover, and watch the valves, while someone cranks the engine. You'll likely see the problem.
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