stripped air mixture screws

[ratgs81750l]

ok .so, rebuilding carbs soon to synch and now having a problem with two of four mixture screws being stripped. not really sure how to remove them besides drilling out head and letting everything fall out. any suggestions seeing as ive already got glue and putty holding things together ,this bad boy is as rat as they come

[chef1366]

I'm a do it your selfer but I wish I wouldn't of tried to drill out mine cause I ruined the carb body. I wish I'd of taken it to a machine shop where they'd of had it out in 10 minutes.

[cberkeley]

Are the threads stripped or the screw heads are so badly dinged-up that you can't turn them?
If it's just the heads that are badly dinged-up I would try a small left-hand bit in a variable speed hand drill (Yes, I did say left-hand bit, they're available and work well when removing screws that are screwed-up). Once removed it may be possible to clean the heads up with afile and recut the slots.
If the threads are buggered .....that's a whole different ball game as the carb body may be screwed (pun intended:-D )

[SqDancerLynn1]

Using a left handed drill +1 thats the way to go. It may even un screw itself. DO NOT USE conventional drill bits as it will force the screw in further when it starts to turn causing damage

[ratgs81750l]

just heads

yea its just the head so the left hand bit sounds good are we talking about like an extractor bit or something of the sort???

[cberkeley]

Nope, there are left hand twist bits and they are great for drilling the holes prior to using a screw-extractor. The left hand bit imposes counter-clockwise torque on the screw when making the hole. This counter-clockwise torque, plus all that vibration and heat generated from the drilling process helps loosen the screw. In most cases the bit's bite is strong enough to unscrew the stuck bolt or threaded part. Make sure you use lots of penetrating oil also, I like Liquid Wrench.
I believe you can find left-hand twist bits at McMaster, Grainger, Harbor Freight, Enco and Grizzly

[Backtobiking]

I removed a couple of stripped air screws by hand turning with the smallest extractor in a kit by Vermont Amercian after making holes with a carbide drill bit slightly bigger than the tip of the extractor in diameter.

Be careful. Brass is soft.

[ratgs81750l]

yea so i got an left handed bit slightly smaller than the hole bc of fear of tearing things up(like i usually do) but it doesnt do jack doesnt even penetrate the head and these things arent brass they are replacements and im not sure what they are

[SqDancerLynn1]

They are brass, some are coated & look like steel. DON'T drill more than 1/4" down. I have at times use a large bit that just fits into the recess to get a starting center hole, drill just enough for the drill point to fit into

[ratgs81750l]

at a loss

im out of ideas ive drilled and sprayed and loosened and drilled and sprayed and loosened but these things wont move at all . im new to this area and im not sure if theres any machine shops around..although maybe i could take them up to my school ( motorcycle mechanics institute) and get them to remove them after all they are getting 20k from me