Hi Tiger, I just keep putting these motors to one side, I know within 5 mins if they will run or not. Problem is the pile of discarded Powertorques is growing all the time. One day I will have to find out what the problem is but I'm not convinced compression is the issue. I have never bothered checking the compression on a Powertorque, I remove the decomp valve, put in a spark plug and see what the compression feels like. A couple of days ago I started a full crank that I struggled to find the compression but it still ran ok. Gave it a hone and a new set of rings and another great little motor up and running and hopefully LRT is happy with it