Jetting for 2001 KTM 125exc

I have the JD jet kit for this bike. The bike was used when we got it, ran OK but would foul the plug everytime we rode it. The JD jet kit says to re-jet based on the current jet in the bike. We had a 175 main in with a needle I can't read..

I tried the 185 JD jet with the Green needle on the 4th clip, bike runs but doesn't seem to have the snap it did before and it is hard to start. I'm uncertain of which way to go with the jets (not sure if I'm rich or lean) Any help would be appreciated. Bike is stock with larger spark arrester muffler.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Similar Content

    • By Jturn
      38MM Cast SmartCarb. Purchased a couple years ago for a yz250. Don't have the bike anymore, and it has been sitting around for about a year. Used, but in fine working condition. You can also purchase a different needle for different bikes, as well as rebuild kits from their website.
      Asking $250 shipped to continental United States. I can arrange other shipping options at the buyers expense.
    • By faizakhtar125
      Hey guys I just bought a bike last night. So the seller said the bike will turn on but then die. We didn't try it because it was really late at night and it was raining (seat was wet). But he said if you bump start it, it will turn on and ride. So what do you think the problem is? I just want to make sure it runs... I probably won't be able to bump start it till Saturday (rain)... It's a four stroke, and I know absolutely nothing about them. Thanks.
    • By knotduke08
      I know this topic has been discussed in the past, but I have not found any options available for the new 2018 bikes. I live and work for a new Beta Dealer (Auburn Extreme Powersports) in California, and we are having a difficult time mapping the RR-S bikes for full FMF exhausts. We have tried contacting Beta Support several times for this issue to no avail, and we typically are given the runaround when transferring to techs and secretaries. From what we can gather, the FMF flash is designed for the RR bikes, but not the street-legal counterparts. Every time we try to install the FMF map onto an RR-S errors occur, and the programmer screen goes virtually blank. We have heard through the grapevine that some are using the RR maps on the RR-S with success, but we have yet to try it, even on our own bikes for fear that it will permanently erase or damage the CDI. Any and all help or suggestions regarding this topic would surely be appreciated! Thanks, Ben.
    • By husky159
      I have the following to sell...
      215 grip studs with the insert tool. Only 2 rides on them. $70 + shipping 
      Stock 17’ 300xc silencer with enduro engineering spark arrestor. (Small dent, a few scratches) $70+shipping 
      hyde skid plate for 17’ 300xc in good shape just your normal scratches. $60+shipping
      mikuni 40mm carb with 2-3 rides on it. Includes throttle cable/ tube. Also extra jets and such. $175+shipping
      feel free to ask for more photos
    • By Charles Mrizek
      This replaces the tube that connects the two carbs on a 1987 Honda XR600R (it may fit other years). 
      Made in the USA. 
      Constructed of TPU  (solvent safe plastic.)
       Its durable stiff abrasion resistant yet flexible enough you never have to worry about breaking it when you're taking apart your carbs. 
      Fits the o-ring perfectly and slips into the carb nice and tight.
      Matches the rear shock coil. 
      If you would like to buy one contact me via e-mail. They cost $20 Shipping is free (anywhere in the USA). $10 off for active duty or retired military. 
      Make your subject: XR600r