Question about 2008 KTM 450 EXC-R

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Wen running hot the overflow of the radiator runs bak onto the radiator and exaust cause a big boil up and smoke everywhere. why is it getting so hot?

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The puke line for the radiator runs to the frame between the radiators. it's a bad location for it and very messy in the event of coolant loss.

yes they tend to run hot...
ktm has a great add on electric fan for your bike and it well help greatly. save money by installing it yourself as its easy to install.

also use Engine Ice or Water Wetter for better cooling.

I prefer Evans NPG, cost more but worth it!

Posted on Oct 06, 2009

  • Danny castle
    Danny castle Apr 29, 2015

    sounds like a blowed head gasket


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Check that fan and water pump are working right

Posted on Jun 28, 2009


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I have replace the water pump, thermostat, radiator cap, antifreeze and purged it for air bubble, but my 2005 Buick Rendezvous still is running hot. The coolant in the radiator is circulating and rema

Well, I would say that the radiator would be next on your list, but usually the overflow is attached to the radiator, so that should be impossible to boil before radiator. How does the temperature gauge look? Even if any parts are hot to the touch that doesn't necessarily mean they are overheated. It may be that the system is still working out bubbles, hence the overflow boiling over.

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Water boiling in the overflow reservoir

Considering that the vehicle was never intended to reach the extremely high mileage it has, it is possible that pressure loss from the one of the cylinder chambers is occurring and leaking into a coolant channel, causing air bubbles to surface at the coolant reservoir. In this case, it may be a bad head gasket or a cracked head. Have you noticed a significant decrease in engine power of late? Is there any oil sheen appearing at the top of the coolant in the reservoir?

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It appears that I am losing coolant via the overflow tank atop the radiator. The truck runs fine, does not overheat, but every so often there is a puddle of coolant under the truck. We have checked...

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By "burns out" I assume you mean it is no longer in the radiator or overflow. Normally a bad thermostat stays in the open position causing the engine to run cold and never reaching normal operating temperature. When the engine is running and the vehicle is parked have you noticed vapor or dripping from the exaust pipe? This would happen if you have a bad head gasket and or a warped head. Another consideration; if the coolant has been a rust color the radiator may be stopped up and need to be boiled out.

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