XR 650 R Heating too much

7 replies to this topic
  • motolama

Posted January 20, 2005 - 02:16 PM


I have 650 R with the following jeting:
Main : 175
Low: 60
Needle: 3 from top
Pilot Screw: 2 turns
The problem is: It heats too much and the idle speed is iregular. And it also backfires a lot.
HELP..... :cry:

  • qadsan

Posted January 20, 2005 - 02:34 PM


What's altitude and temperatures are you riding in?

  • froride1

Posted January 20, 2005 - 02:38 PM


By low I think you mean the pilot jet. A lean pilot will cause backfiringand and might cause idle problems. I'm running a 68S pilot jet and don't have any backfiring problems anymore.

  • HeadTrauma

Posted January 20, 2005 - 09:45 PM


I run a bigger pilot jet than that in my smaller 600. You need more low throttle fuel, and that means a bigger pilot. Most everyone recommends a 68S pilot, so that might be a good place to start.

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  • TimBrp

Posted January 21, 2005 - 04:19 AM


He's totally lean. I don't even see how this bike came with a 60 pilot, different country I guess. However, to my knowledge the smallest size from the factory was a 65. Strange. Get the 68s and don't look back. All those issues will be gone.

  • motolama

Posted January 23, 2005 - 05:40 AM


I'm riding at around 3600 feet and the temperature around 20 ºC

  • motolama

Posted January 23, 2005 - 05:42 AM


I´ll try that... Thanks... By the way: Yes I meant pilot jet.

  • qadsan

Posted January 23, 2005 - 09:24 AM


The 68's pilot jet should minimize overheating and backfiring. If your top end performance at Wide Open Throttle seems a bit soft with the 175 main jet, then
I'd recommend trying a 168 or 170 main jet for better wide open throttle performance while riding at 3600 ft @ 20ºC.

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