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TahomaTom

XR650l -will start -only idle with choke-backfiring

7 posts in this topic

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-

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

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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.

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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)

Dave

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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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