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crf450x getting warm

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me mates 07 450x is getting hot when moving slow. He's done service, he's a boss of fitters at me work so he's not dumb.

All basic things around bike have being looked at and cannot see the fault. The coolant is bubbling in over flow tank at low speed all of a sudden.

The bike he has had from new and we have done many kays together. My bike should get hot before his being race bread so something has happened.

To me it sounds like the cooling system has lost alot of it's cooling capicity some how, where or what i dont know.

Anyone had similar trouble's? or could suggest a cause?

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The X doesn't normally run hot. Did he make a jetting change? If not, then the likely culprit is the water pump. Check for drips coming out of the weep hole.

Also, if he is running stock jetting, and it's anything like stock US jetting, then it needs rejet to run cool.

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Thanks for input guys , will go thought all ur ideas and see how we go.:)

P.S The air box has being opened up but standard jetting still

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If the jetting is stock then that is definitely the problem. Jet the bike and it wont overheat anymore.

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