So I got the motor all hooked up today and got it started for the first time. I noticed that the four bolts on top of the head were a bit loose cause it was leaking some smoke from around the gasket under the top of the head. In trying to tighten them down just enough so it won't have a head leak, one of the bolts seems like it won't tighten. It just keeps turning and turning. What can I do to fix this? motor only has like 5 mins run time on it.