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Sorry Bart but you are getting this way more complicated than my little brain can handle. The STIHL tool is made by Thexton and I adopted it because it is calibrated with one gauge for percent of leakage and the other to see the incoming air as adjusted by the regulator. It is designed for use...

If you are doing a leak down test on a four stroke it doesn't matter what the shop pressure is, just zero the gauge before you hook it up and then read the percent of leakage and locate where with your ear. For a two stroke that is failing the vac pressure test on the crankcase, hook it to the...

I put this leak down tester, 5910 850 0300, in Service for STIHL back in 2004. It is calibrated for small engines so it doesn't over pressure the engine like an automotive tester would. See attached for instructions on using it for the STIHL 4-Mix engine as well as how to use it on two-stroke...