Hot Hot Hot

9 replies to this topic
  • Thresher90

Posted February 05, 2008 - 11:15 AM


Started the XRR yesterday and it was running really HOT! So I shut it off and the overflow tank was about to over flow. :worthy: So I honestly have no idea what to do. Can these bikes get vapor lock like a car can? :busted:

Any help would be greatly appreciated. Thanks in advance.

  • Agent2

Posted February 05, 2008 - 11:29 AM


Corked, uncorked? How old? Stock t-stat / coolant? Any recent mods, crashes etc? A little more info might narrow down a possible problem.

  • Maroast

Posted February 05, 2008 - 11:51 AM


yeah, is that badboy corked up? If it is it will be running REAL lean...and thus REAL hot!!

Mine use to boil over before I uncorked it all the time...

  • Thresher90

Posted February 05, 2008 - 12:00 PM


Ya it is uncorked. Its a 2001 XR650R. No recent crashes and thats about it. I do know that I took the Radiator cap off the other day and its not the stock one.

  • Agent2

Posted February 05, 2008 - 12:42 PM


Were you riding or just letting it run? Dosen't take long to get hot without air flow through the rads. Water pump failures are rare, but do happen. The stock t-stats fail, but usually in the open position. Might want to do some basics -make sure the bike hasen't leaned out, Autozone has thermostats for a Suzuki Swift - part# 7203-180 (Motorad Failsafes) that fit the XR, you have to drill a weep hole on the flange. Drain the coolant, replace with 50/50 blend of non silicate and distilled water. Check the Rad cap, I believe Stant has one that fits, not sure of the the part #.

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  • Maroast

Posted February 05, 2008 - 01:42 PM


Yikes! an uncorked XR about to boil over in Michigan in February...I'd seriously investigate this....

Like said before, drain the bike and check/change the thermostat first (they do usually fail in the open position though-->mine did)

While you got the coolant out, pull the cover and expose the water pump impeller....with the ignition off, use a piece of cord to tie the decompression lever in the the open position. You can crank the kick starter with your hand and assess the movement of the impeller. I would hold the impeller with my hand too while cranking it to determine if its slipping on the shaft.

Other than that I cant think of anything else to diagnose the problem other than flushing the lines to ensure patency. Good luck! and let us know what you find.

  • Thresher90

Posted February 05, 2008 - 01:55 PM


Ya I was letting it idle for about 10 minutes or so.

  • porterdog

Posted February 05, 2008 - 03:23 PM


Ya I was letting it idle for about 10 minutes or so.

That's your issue right there. Wouldn't worry until it starts doing that while you're moving.

  • Denn10

Posted February 05, 2008 - 03:52 PM


Ya I was letting it idle for about 10 minutes or so.

10 minutes to idle, theres no reason for a bike to idle for that long. No airflow means its gonna overheat.

  • Thresher90

Posted February 05, 2008 - 04:04 PM


Thanks guys ill be sure not to do that again :busted:

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