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2005 rmz 250 pipe glowing red when started

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i just bought a 2005 rmz 250, when started for about a minute the pipe gets glowing red! i too afraid to drive it, it has a fmf bowerbomb on it, is the jetting too lean?

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It's running lean. I have the full Yoshimura system and I had to bump my main up 2 sizes, my pilot 3 sizes, and drop a notch on the needle. Everything varies due to your environment/elevation, but it is running lean. Plus, these bikes get hot fast without moving air.

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A huge air leak may be causing it to run that lean, especailly if it was working OK before. Look for a rip in the intake between the carb and cylinder. In a car enigine, I'd be looking for a broken vacuum line.

The idle should also be high if it's an air leak.

Anyway, just another thought besides jetting.

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