Sam without tearing the engine down, there is no positive way of telling if it's a series 1 or 2. Now if it has a plug for the oil fill, it's probably a series 1 and it won't work on the OP's engine. Depending on which side the OP has issues with, even a series 2 cylinder won't work because of the magneto mount.
Pete if you want replacement cylinders pm me. I have some M18 cylinders laying around that I would sell.
AJ
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1980 [COLOR="Red"][/COLOR]482- Stock
1981 [COLOR="Red"][/COLOR]582- Mag18, Sleeve Hitch, Spring assist
1979 [COLOR="Red"][/COLOR]682- Mag18, Sleeve Hitch, Spring Assist, #1 Tiller
1980 [COLOR="Red"][/COLOR]782- Mag18, Sleeve Hitch
1983 [COLOR="Red"][/COLOR]982- Stock, Fully Optioned
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