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Pocket bike engine problem

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Hi,so i recently picked up a pocket bike for €30,and it came with the engine out of the bike.So its missing a pull start but it has good compression. When I turn the flywheel,I hear a scraping noise,which only happens when the silver parts on the flywheel touch the magneto. Any help would be appreciated ,thanks

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Things to check: bent flywheel, or missing mounting bolts; bent crank would cause the noise, to check look for leaky seal at cases and crank area. Crank bent? Toss it in dumpster.  The flywheel might have a "key", and it got mounted incorrectly, key not aligned.

Or just ride it till it quits and sell it.  Too many other good things  to do with life? 

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