[Clyde65]

I bet that motor was cheap like a Jasper engine either. They should do the right thing, I would ask them to reassemble and put it on the dyno and run it for an agreed period to see if it has the same issues. If it does, then they have an issue to deal with, if not, then you have a good engine and they have a happy customer and a real cheap fix, no matter what the issue WAZ, it's fixed and your happy.