The left cylinder has 165 with the carbs off. Went to do the right one which is the one that was not firing and I couldn't get the tester to screw in. I get a flashlight and look close to find the first three or four threads gone or almost anyway. Is there such thing as a long reach tester? If there were and the compression was the same I would let it go for a while. I really don't like or want to put inserts in. Has anyone here used them with success and had confidence in them? It is starting to look like I didn't get as good a deal as I thought. Top end job with possible replacement head that I will have to job out.