I just ripped it around my parking lot for 2 tanks. The engine cooler part never really got hot, but the pipe got pretty hot. I know it's not tuned right, seems to be running rich. It blows blue smoke even when on full throttle. It is 80+ degrees here right now. I hope to take it out to the local track this week. I'm going to go home to get all my tools, and I'll start tearing it apart and rebuilding it this week.