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93 xr250l glowing exhaust pipe?

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A buddy of mine just picked up a great condition 93xr250L for cheap. He bought it from another friend. He put a new battery on it and a spark plug from an 84 xr250 and started it up in his dim lit shop. He noticed a big orange glow from the exaust pipe near the head.

He was thinking the new plug was different, so he put the original plug back on and still noticed the glowing but not as bad. Is this fairly normal? Bike does not smoke at all and runs great. What do you guys suggest for him?

Thanks

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How long did you let it run? If you sat there for 20 mins running it that might explain it. If you only ran it for a few mins it could be very lean at idle. Just to be safe I would check the jetting to see if it is stock.

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A little glow at night if you don't have it moving is normal from revving it. But check the plug and then have him take the carb apart and clean it really good and check the needle level just in case, etc.

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