I am wondering if my cheap Harbor Freight compression tester is no good. I just bought a 2002 Scrambler 90 and tested the compression. It reads 40 psi but starts and runs just fine with a lot of pep. I tested my wife’s 2000 Scrambler 400 two stroke and it reads 95 psi with no trouble starting and running. Just for the heck of it I tested my weed wacker and it reads 25 psi with no starting or running issues. Do I have a bad tester?? With readings that low they shouldn’t even run, right? What do you guys think?