XR650l -will start -only idle with choke-backfiring

6 replies to this topic
  • TahomaTom

Posted February 19, 2007 - 12:30 PM


Ok first the L would not start so I went and got some gas. :applause:

I filled her up and it started right away :lol: but wont idle with the choke off.

I can ride it :cry: but need to keep the choke open 1/4 to 1/2 of the way when I come to a stop sign.:
I can turn the choke off when riding and it pulls ok but it back fires a little bit.

I checked the plug and air filter and it looks good. I got a new CDI about 500 miles ago.:applause:

The only thing i can think of is that my clutch cable is starting to fray but it has been like that for 5-6 rides before I parked it and has never been a problem. Is it hard to replace

Oh yeah one more thing the idle did cyle a bit at the last stop light. Went up than down and the choke was on.

Any suggestions?

the bike a 94 650l 14K, is jetted, exhaust, smog off, clarke tank etc.

Thanks for the advice in advance-

  • JackAttack

Posted February 19, 2007 - 12:36 PM


Pull the bottom off the carb and clean the main and pilot jet. You should be able to see through both.

  • creeky

Posted February 19, 2007 - 01:31 PM


Carb need cleaning.

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  • Motosprtman

Posted February 19, 2007 - 01:43 PM


or a loose jet... had one fall into my float bowl once made for all kinds of fits.

  • motomonte

Posted February 19, 2007 - 06:50 PM


Make sure it's not leaking air...check the boot between the carb and the head.try spraying some wd40 in that area,if it's sucking air the roughness should go.

  • XR650L_Dave

Posted February 20, 2007 - 08:52 AM


A few thoughts:

- could be water in the gas
- if it has had the pilot jet replaced, and they used a long pilot jet, the slosh baffl could be blocking the jet
- fuel screw got bumped?
- latest batch of gas was gasohol (makes the jetting 14% lean for a 10% ethanol mix)


  • xrltim

Posted February 21, 2007 - 08:20 PM


That will be the pilot jet being partially or fully clogged. It is the smallest orifice in the engine and sitting for a lengh of time or dirty gas can easily plug it up. Especially a problem in small engines. A buddy of mine has gotten many a good deal on little bikes for his kids because they wouldn't idle without the choke. Easy fix.

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