As I follow what I learn on this site I make the changes to the engine. One thing I read is about keeping bolts, plug, and chain tight. I checked the plug and the engine had tilted just a snug that I could not get the socket down true over the plug. I took the engine bolt back a bit and gave the engine a tap with a rubber mallet. This worked great. I snuged up the plug and tightened the motor bolt. I never gave the engine a tap back to the tilt it was at from the start. I am starting my see how the engine works after the changes that I made once around the circle and the chain link broke. Since I never bumped the engine tilt the chain was not in a true line. This must have put a twist in the chain and poped the link. So, take it from me and be true with the chain line up.