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Wisconsin AEN LD 2 stroke 9.2 hp engine?

I've just got hold of a rail section car with the above engine fitted. It had not been used for a couple of years but we managed eventually and started playing. The problem I have is it travells in one direction well but in the other direction it 's hard to start and looses power. It also over heats  I would say it has something to do with the mag and timing. Can someone please help.