Quote:
Originally Posted by Simonpie
A few years back there was a 2 stroke test that ran a mototrcycle on a dyno with progressively lower gas/oil ratios. The thing made more and more power each step until it fouled out a plug at somewhere around 7 to 1. The mechanisms can be lowered friction from lube, higher compression from the unburned oil, and in an old 4 stroke, better compression from freeing stuck valves or rings. If your lifters are noisy, your valves either aren't closing, or with hydraulics, aren't opening fully. If MMO fixes the noise, it fixes the compression too.
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I guess I was kind of stupid to assume we weren't talking about a worn-out engine with sticking, ill-fitting valves, broken rings, leaking lifters and combustion chambers full of carbon. DD