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Well, I guess if compression is a function of valves sealing and rings holding pressure, then a leakdown test is pretty much the same thing as a compression test. Same conclusion (everything tight, good compression), different means of arriving at it (holding pressure). I think. Hate to shell...

Thanks again, hammermechnicman, Got it. Never thought about it much; quick search produced a nice little graph that shows the relationship between voltage, compression, and fuel-air mixture temperature. Explained a lot. Thanks for that tidbit of knowledge! Nope, I have no desire to defeat...

Hi bertsmobile1, I am absolutely NOT arguing with you... just trying to understand the 'mechanics' of this thing. Perspective: I was a forklift mechanic for nearly 30 years (electric lifts, unfortunately in this case). I used to HATE working on the propane-fired lifts! So by leaving the...

Thanks Hammermechanic man, I did run across mention of something like that elsewhere; wasn't sure it was included on this engine. If this is correct, I guess I don't understand how it manages to achieve enough compression to work; if it's pushing out air/fuel charge as the piston is coming up...

Hi Folks, Have a circa 1991 130212-3250-01 (code 91061910) 5HP horizontal shaft engine (happens to be mounted to a chipper-shredder). Pull start rope: zero compression (based on pull feel - no 'stack up'). Pulled head; both valves stuck open. Freed up exhaust easily, and it cycles and seals...