Make sure and remove the access screw from the chain tensioner and make sure the o-ring is in tensioner. If not it will leak and run down the engine. Also not knowing which GY6 you have and how old, some older models had a chrome 6mm screw in cylinder that seems to go to nowhere. If so make sure it is tight and has the gasket. Either one will give the appearance of leaking from the base of cylinder.
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