Originally Posted by
1QwkSport2.5r
A lapped engine usually won't exhibit the compression loss when hot like an ABC engine will. How does the engine feel when turning over cold and then turning over hot? Will it do the same thing if the HS needle is set a fair bit fatter? Did you read the glow plug? Try a new glow plug? Head bolts still tight?
Lapped engines are more prone to compression loss when overheated than ABC engines. In fact that is why ABC engines were invented,. Many a time I have had a Fox Stunt engine barely running because it was running lean and hot, but still running. They are ususually OK after that but not good for the engine,.