Do not run this engine any more!!.. Is the exhaust stopped up? This is the first thing I would check, Remove the exhaust - you should be able to use your mouth to blow from the engine side and feel the pressure out the back.- birds, rats, cats, etc. can be in there! Has this engine been locked up (flooded with fuel, flooded with water?.. and then tried to be started?? If so the the cylinder exhaust that gets red hot MIGHT have a bent connecting rod!! I saw this happen on a racing ATV once,,it flooded, they tried to pull start it.. once it cleaned out and ran - the exhaust got RED hot.. -- Bent con-rod!!
SOURCE: 2006 yz250f header is glowing at idle, has not done this before.
combustion chamber is tooooo hot. Mixture is way to lean
SOURCE: glowing exhaust header yamaha wr250f
It won't be valve timing or clearance. The fuel/air mix would be the culprit. Clean the carburetor with special attention to the idle circuit. Remount the carb with new manifold gaskets. A manifold air leak will mess up the mixture. Also, get a new spark plug one heat range colder than stock. Hope this helps out!
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SOURCE: On Yamaha wr450 dirt bike the exhaust pipe gets
Sounds like you are running waaayyy too lean. Aftermarket intake/air filter/exhaust?
SOURCE: i have a 2001 yamaha wr250f and after running only
Air leak causing a lean fuel/air mixture, bad radiator cap killing pressure in the cooling system, low water in the radiator, plugged radiator, broken water pump, not using premium gas and a spark plug with the wrong heat range.
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SOURCE: YAMAHA TTR 250 cherry red exhaust
Because the timing is off. If the timing is too advanced, or too retarded, it will make your exhaust pipe cherry red.
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