HELP: 09 KX450F Turns off after about 15 minutes of running

Anthony_Horner
My 2009 KX450F will run fine for about 15 minutes before it shuts off. Once it shuts off I cannot start it back up immediately. I have to wait about 20 or so minutes (maybe to let it cool down?) to kick start it and it'll start right up. Along with this, I noticed when I rev the engine at a high RPM in neutral, the coolant overflow hose spews out coolant, or water... I'm not sure which.

I have read online that the cause could be many things, blown head gasket, bad radiator cap, or other things.... I recently had the head gasket replaced so I doubt it is that.

Will overheating cause the bike to turn off(stall) automatically? Any advice and information would be greatly appreciated.
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Factor E
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So Cal, CA US
Factor E 6/24/2022 9:03pm
6/24/2022 9:03pm
Are you losing coolant?
Something is getting Hot
I would check cams and lubricating system
Make sure water pump impeller is good
kb228
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Mansfield, OH US
kb228 6/25/2022 8:24pm
6/25/2022 8:24pm
The coolant temp sensor on the back of the cylinder is bad. Had the exact same thing happen to mine. Might also check for a blown head gasket

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