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340 Main too lean? '00 CR125

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Since the pipe flows better the engine will draw more fuel through the same size jet requiring you to lean the jetting for an ideal fuel/air ratio.:lol:

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Ok. Think I've figured out jetting BUT I'm still getting spooge.

Running 340 main, 40 pilot, 2nd clip on stock needle, and air screw 2 turns out (using idle speed test). PC pipe & Ready Racing filter (clean). Yamalube 32:1.

Two things I'm noticing, I have an small exhaust leak out of the head and at the silencer joint. Will this affect jetting?

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What's ur plug look like.shouldn't affected ur jetting,my old cr80 always leaked around there...

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