Erratic Idle

6 replies to this topic
  • MMH

Posted August 06, 2009 - 01:09 PM


I have a CRF50 & a CRF70. They both have eratic idles - not terrible, but wanders around more than I like it too. I heard that the likely problem is a plugged pilot. How do I remove the pilot & clean it?

  • john01

Posted August 07, 2009 - 08:31 AM


Well I read you couldn't remove them but on my grandsons bike that I picked up used I removed it and cleaned it. It's not necessary if you have an air compressor, very small wire, and carb cleaner. I was curious so I removed it. This cleaning didn't help the idle. It would go up, down, and hang just all over the place. I would get it close and it would change. I ended up checking the valve clearance. The intake valve was way to tight. I adjusted it and the bike now runs way better and idles like a champ. He can now take off in third gear where before it struggled in second. You may also want to check your air filters.

  • thumper dad

Posted August 07, 2009 - 05:09 PM


I had noticed the same thing on my crf70. I had a rpm gauge on it and it bounced up and down. Same problem with starting in second, I think I'll check the valves. This was just the info I was searching for, Thanks.

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  • john01

Posted August 07, 2009 - 08:29 PM


You are very welcome. It was driving me nuts and my grandson.

  • warrick75

Posted August 12, 2009 - 07:08 PM


I will check that as well, I just got my son an 02 XR 50 from a friend and the idle would jump around as well, tend to stay high after letting off on throttle. I cleaned the carb, changed the plug, cleaned the filter so I will now check the valve clearance.
Thank you

  • thumper dad

Posted August 13, 2009 - 04:52 AM


I checked the valves in our 70, and the intake was too tight, It still bounces a bit at idle but not as bad as it used too. I dont notice any difference driving, but Then again the bike wasnt made to haul around an adult. Ill have to ask my son if he noticed if it felt better.

  • john01

Posted August 15, 2009 - 06:51 AM


Good deal.

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