Hot topic. How lean is too lean?? Poor power, high temps, easily boils over, white spark plug, not much piston wash. Pinging under load. IMO a well jetted exhaust note sounds crisp and clean. A lean one sounds too tinny but more so lacks power under load. A rich exhaust note sounds wet and dull.
The easiest way to tell is to richen it up and see if it makes more power. If it does then it was a bit lean. If it gets too rich and starts to break up then switch back.
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