yz450 operating temp

3 replies to this topic
  • bwf8907

Posted April 13, 2011 - 07:21 PM


took my bike out for the first time after the rebuild and the new pipe....bike is a 2009 yz450 with a 165 main and 45 pilot otherwise stock jetting.....bike ran consistanly at 152 degrees all day with outside temp at 60 degrees....is this a normal temp or is that a little low? bike seemed to be running a little rich on the bottom end and at idle gonna try a diff pilot

  • grayracer513

Posted April 13, 2011 - 09:57 PM


Try dialing in the fuel screw first.

The cooling system has no way of regulating temperature (no thermostat). The operating temp will vary somewhat depending on the ambient and on your speed, but 140-160 is not abnormally low, no.

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  • bwf8907

Posted April 13, 2011 - 10:08 PM


fuel screw is at 1-1/2 turns out right now

  • grayracer513

Posted April 14, 2011 - 06:52 AM


Try a 42, then.



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