Broken idle mixture screws!!! HELP

[red bandit]

I know this doesn't help you now. I made a drill guide that fits in the threaded hole and then use a stock size drill that will drill out the tip and stay on center. So if anybody needs to drill out any tips, pay for shipping and you can use it.

[3Phase]

For drilled out idle mix holes, maybe drill it out a little and replace with a conical plug with a stock size hole, any ideas out there

Hmm... I don't know if the material in the carb throat and the mixture screw well is thick enough to drill and hold a plug.

If the material is thick enough you might be able to trim off the metered part of a pilot jet, then drill out the carb idle hole and press the metered part of the pilot jet into the new hole.

It'd have to be centered pretty much dead on or the idle screw tip would touch one side or another of the 'new' idle mix hole and it wouldn't meter properly. If it's far enough off centerline it could break off the tip in the hole again and you'd be pretty much screwed, again.

Good thinking, Garth!

Regards,

Scott

[GARTHXS]

hmmmmmmm?

I am just thinking outloud, what about that micro laser welding they were talking about in the float post thread, add a little more meat and then a proper size hole? ??

[3Phase]

... what about that micro laser welding they were talking about in the float post thread ...

Sure it's doable but it would probable cost the same, retail, as a set of non-hammered carbs off of eBay, a parts bike or out of a wrecking yard.

If you have your own laser that's a different story, amigo, and I have a set of '79 carbs that got hammered when someone drilled out some broken idle scre....

Regards,

Scott

[mro]

proper size hole? ??

I've not inspected the area where the needle passes thru ...
I'd bet it's not just a "proper size hole" but a specially designed tappered bit was used to create the passage for fuel/air.


mro
(I know what I said, but do you know what I mean??? )