2006 yz450f overheating problem

I have overheating problem with my 06 yz450f when I go into the woods or go on the low speeds . My body has a 2003 yz250 and has no any problem with overheating even if hi gets stack and has hard time to get out of the woods.

Is something wrong with my bike or that`s normal becouse of not enough air flow at the low speeds. I have even replaced colant for Ice Cool antifreeze. After that runs little bit better but finally overheats in the woods.

Anybody can give me some ideas ?

The YZ will get hot if your putting around in the woods. Those rads need air flow to keep the engine cool otherwise it will overheat. You could always try some engine ice and water wetter and see if that helps.

You really can't compare the two bikes in this area.

It's all about BTU's - how much heat is produced, transferred to the coolant and then convected to the air. The key to the convection is airflow, which is decreased at low speeds.

I think it's a reasonable to assume that the 450 produces more heat than the 250. If you aren't experiencing overheating with the 250 under the same conditions, then the cooling system is adequate and would appear to have a larger "buffer" for these conditions than the 450.

Ideas -

Make sure the system is free of air.

Larger radiators (expensive).

Boyesen impeller (more efficient flow, transferring more heat to system)

Use the stock louvers to direct air through the radiators if you aren't already.

If it's really bad, perhaps find a way to install a battery operated cooling fan, but I suspect this would involve a lot of effort.

:devil:

Are you sitting and idling a lot? Mine does fine as long as I don't sit and let it idle excessively. I have my idle set fairly low which I'm sure doesn't hurt. I have never boiled over and the trails here in Hawaii are extremely tight and technical with monster hill climbs. Don't let the bike sit and idle for long periods of time and if you get hung up on something, don't redline the bike trying to get out. My buddy does that with his CRF and that bike is constantly overheating.

I have overheating problem with my 06 yz450f when I go into the woods or go on the low speeds . My body has a 2003 yz250 and has no any problem with overheating even if hi gets stack and has hard time to get out of the woods.

Is something wrong with my bike or that`s normal becouse of not enough air flow at the low speeds. I have even replaced colant for Ice Cool antifreeze. After that runs little bit better but finally overheats in the woods.

Anybody can give me some ideas ?

How do you know when it over heats?

I do not idle a lot, if I do it`s overheat. I do known it`s overheats couse is bubling and steam is going out.

EVANS NPG-R,they're right up there in joisey :devil:

if your going slow and not gettin much air to the radiators then its going to overheat pretty fast my 426 did this too and still does but not as easy. I changed my main jet a size bigger to make it run a little richer and that helped it alot

maybe u can try that

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