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how hot?

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Jun 18, 2007
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#1
i finally got the gas leak to stop on my 03' yz450f but now i'm wondering if it is running too hot? it seems to be very hot when i get close to the block/exhaust, and was even hot enough to melt the airbox by the exhaust pipe. oil/coolent?
 
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Jun 18, 2007
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#2
even after a couple minuts or riding anything rubber near the exhaust pipe begins to smoke, carb vents, plastics. i'm guessing that the bike is running too hot but y would that be?
 

Rich Rohrich

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#4
Normal exhaust gas temperatures run in the 1100-1550 F range and the pipe wall thickness is less that .050". Of course the pipe is HOT and rubber melts when it's too close.
 
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#5
still, a bike shouldn't be melting its own plastic. i would try mixing more water in the antifreeze and maybe a anti-corrosion additive to compensate for more water, and check the jetting
 
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#7
chastastic said:
even after a couple minuts or riding anything rubber near the exhaust pipe begins to smoke, carb vents, plastics. i'm guessing that the bike is running too hot but y would that be?

Check your valve clearance. Had the same thing happen with a CRF150R. Stayed hot even while riding it. Turned out to be tight valves.