WR450-new radiator installed & now bike won't run properly

3 replies to this topic
  • clamp007

Posted October 05, 2012 - 11:18 AM


looking for help! After installing 2 new radiators & filling them with engine ice coolant, I find that the bike now won't run properly. It keeps cutting out or I hear that pffft sound out the back of the exhaust. I believe there may be some kind of air lock in there. My mechanic says to run the bike & then lean it over at 30 deg & open the radiator cap, which should release the air. I tried that, but not only did it squirt hot coolant, but it's hasn't solved the problem. Any ideas??

  • Dougie64

Posted October 05, 2012 - 09:04 PM


Sounds a bit odd that a cooling issue would do this? Does it run rough right from cold or only when hot? Sounds more like you knocked an electrical connection or something upon installing the radiators.

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  • MANIAC998

Posted October 07, 2012 - 03:42 AM


I agree with Dougie. I think you have some sort of poor electrical connection going on, after working on the radiators.

  • William1

Posted October 07, 2012 - 11:00 AM


Check the large ground wire on the right side above the exhaust header below the valve cover on the head.

Absolutely is not a coolant filling issue.


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