Jerry Eichenberger wrote on 04/16/08 at 07:08:02:No, we don't run airplane engines too lean, but we have, in the past couple of decades, run them far leaner than before.
In fact, most engine manufacturers (Lycoming and Continental) now recommend running lean of peak exhaust gas temps. when the power is below 75%. You still get the same result; lower temps, you just do it on the lean side of peak rather than the rich side.
Couldn't you do the same for a bike engine? This is radical thinking to old timers like me, but when you take an objective look at it, again, you get the same result, cooler head and exhaust temps., and lower fuel flow rates.
Running lean of peak works on aircraft engines IF you have BALANCED injectors like Gami's. Not recommended on carburated engines since the mixture is not as evenly distributed.
Carburators have different stages of fuel delivery (Needle,main and Idle jets) and have richer and leaner spots while opening the throttle.
Mine runs super with the below mods, runs clean, I can not even get my fingers dirty (no soot) by sticking them in the exhaust.