Bike Over Heating

10 replies to this topic
  • RowdeeT

Posted June 27, 2016 - 07:51 PM


I just bought an 06 yz450f with brand new top end, with hot cams and it's getting way hot when I ride. Would anyone know why?

  • Bigfoot0518

Posted June 27, 2016 - 08:28 PM


Is it boiling over or?

  • ThrustWasher

Posted June 27, 2016 - 09:58 PM


How do you know its getting too hot, What symptoms is it showing?

  • hawaiidirtrider

Posted June 28, 2016 - 12:24 AM


I just bought an 06 yz450f with brand new top end, with hot cams and it's getting way hot when I ride. Would anyone know why?

idk ..put some big radiators on it and a fan.

  • RowdeeT

Posted June 28, 2016 - 04:46 AM


It's coming out the over flow.

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  • 0bigsilver6

Posted June 28, 2016 - 05:08 AM


Could just be over filled. If it's over filled it will boil out the over flow until it gets down to the proper level. Also maybe change the rad cap.

  • grayracer513

Posted June 28, 2016 - 06:55 AM


Is it heating while under way, or while idling for a while?

  • RowdeeT

Posted June 28, 2016 - 07:56 AM


While I'm riding. When I stop, I notice it.

  • grayracer513

Posted June 28, 2016 - 08:06 AM


Normal behavior would be that if filled to the top, the radiator will expel coolant as it expands until it reaches operating temperatures.  This should stop after it reaches this point, and it should leave the coolant about at the tops of the radiator tubes once it cools off. 


If not, have a dealer test the cap.  It could be weak, and not holding adequate pressure.  If the cap's OK, whoever did the top may not have installed the head/head gasket correctly (torque).

  • kurtcrf450

Posted June 29, 2016 - 06:18 PM


Also they need airflow so if your not going fast enough it'll run hotter than normal because enough air isn't making it through the radiators to cool it


Posted June 29, 2016 - 09:17 PM


As the top end was just done, I'd say the issue is a bad head gasket. Combustion gas is being pushed into the coolant system, causing the overflow, which then lowers the amount of coolant and causes overheating.

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