Anyone else ever broken an air screw?
 

Hello All,

Longtime lurker,

Ever since I bought my '01 250 xco I have been unable to adjust my airscrew. It has always been turned all the way in and will not budge. Well after installing the LTR needle the other day I was determined to loosen up this seized screw. To no avail I broke off the head!!!

Any ideas on how to get it out and replaced?

Also the flexible air boot that the backside of the carbbie goes into needs to be replaced as the rubber is somewhat dried out and flaking. Anyone have this problem?



Thanks
Tim

You can drill the screw out, it is just soft brass. be careful not to damage the threads in the carb with the drill. The air boot sounds typical to an older bike. I find that using wd-40 keeps the rubber conditioned and more pliable over the years.

ok i'm going to sound like an idiot here but the "air screw" that I broke was plastic not brass. Any schematics of the carbby online?

Tim

Sudco is the u.s. importer for keihin; From their website:

http://www.sudco.com/Diagrams323728/exppwk.gif

jeff

I think he is refering to the idle adjuster screw. #29 on the attached image.

I think you would still have to go the drill route and then carefully run a tap through to clean out the threads.

yep the #29 idle adjustment. Anyone else had one seize up on them?

No, but they get hard to turn and flex when the spring is near coil bind(close to full in). With the LTR jetting this will not be neccessary.

Yeah, the useless plastic 'thing' on my carb's always been hard to adjust ever since i bought the bike. been wondering if they do a brass/steel replacement? or does it come with the ltr jet kit?

Gonzo,

The plastic idle screws have a sealant on the threads that make them hard to turn. I do sell the PWK plated steel idle screw.

Brilliant! Just a shame you don't ship outside the US or I'd buy one this second.
And would have probably sent you my head by now.