Where to set adjustment screw on bottom of carb

Hey guys, I'm working on a 2008 SXF 250 for a friend, we found the the adjusting screw that threads in from the bottom of the carb had fell out.We ordered a new one but I was wondering where to start from on how many turns out from tight. I guessed 1 1/2 turns out, but wanted to ask because this is my first KTM thats not a EXC. Any help would be appreciated:thumbsup:

Thanks,

Cody

Make sure you install the spring, washer & 'o' ring also. Set it to 2 1/4 turns initially, then tune it properly. Do a quick search for pilot jet/fuel screw adjustment.

around 2 turns is the start, and as said the washer and o-ring have to be there too or it wont idle right cuz it will be sucking air

Thanks fellas, I put it in for him last night. And started it at 2 turns and left it. It was rode for roughly a hour and a half and he called and said it fell back out, any ideas on whats causing it to loosen itself? would stretching the spring help?

is the o-ring and washer in it too? The o-ring gives some resistance along with preloading the spring. If it was all there then the hole must be worn or too big for some reason.

Yeah i had them both in, it seem to thread in there with no problem. Althought I did notice it seemed to wiggle a little bit, but I thought it was the hole carb wiggling. I know with bolts if the hole is worn they usally seem to be a little difficult to start the thread. The guy found one on internet that has a knob and a safety wire in case it does fall out. Seems like a good idea but I hate for him to pay $75 when there maybe a simpler less expensive fix. Any ideas if it sounds like the hole worn? Or how I could check it?

Thanks for all help so far.

Yeah i had them both in, it seem to thread in there with no problem. Althought I did notice it seemed to wiggle a little bit, but I thought it was the hole carb wiggling. I know with bolts if the hole is worn they usally seem to be a little difficult to start the thread. The guy found one on internet that has a knob and a safety wire in case it does fall out. Seems like a good idea but I hate for him to pay $75 when there maybe a simpler less expensive fix. Any ideas if it sounds like the hole worn? Or how I could check it?

Thanks for all help so far.

Sounds expensive for $20 external fuel screw and a piece of locking wire.

If you are using an OEM screw, try this......Set your pilot to the correct setting. Get a piece of silicone tubing (overflow pipe or whatever) that is a tight fit in the hole in the float bowl. Push this up, after you have it set. Leave about a 1/4" out the bottom for easy removal. You can put a pen mark on the tube level with the bowl, so you can tell if there is any outward movement, but there shouldn't be.

blue loctite or some form of soft thread lock, maybe booger the threads on the new screw a little to make it get a grip

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