how hot?

[chastastic]

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?

 

[chastastic]

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?

 

[adam728]

Running lean?
Timing off?
Air leak in the exhaust?

 

[Rich Rohrich]

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.

 

[1989kx250]

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

 

[phatford92]

yah thats a good start but still its weird that its getting that hot.

 

[Ol'89r]

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.