carb throttle shaft rebuilds

[Brant]

I need to get my throttle shafts rebuilt.
I've been doing a few searches on the site for potential rebuilders

I don't know exactly what or how this is done
is the body usually bored out and a bearing installed?

I would love advice to help me choose a cost effective rebuilder
I'm on a budget, yet want to get it done right

anybody have consumer experience with the shops doing this?

thanks in advance
brant

[berettafan]

www.performanceoriented.com

i too was on a budget. i am a happy camper.

[Brant]

good tip on Paul Abbott.

is this the typical method of repair... to bore and bush the carb body?

anybody else have experiences that are different from this technique?

brant

[1QuickS]

The primary issue with worn Webers is uncontrolled air making is way into the intake cycle, either through increased radial clearance between the throttle shaft and the main body of the carburetor or past the clearance of worn throttle butterflies and the main throttle bores. Most of Weber's carburetors use radial ball bearings to support and positively locate the throttle shafts so this wear is avoided. The three barrel Webers use plain bearings (no rolling elements.)

Repair of the worn elements requires a disassembly, inspection and typically line boring the throttle housing to accept new plain bearings followed by a finish boring to accept the throttle shafts. On the carbs produced from about 1969 on, Weber incorporated a nylon "bearing" that supported the throttle shafts in the outer-most bearing journals. This nylon bearing didn't properly support the shaft so that rapid shaft clearance developed as a result. This is not all bad since the shaft supported by the nylon bearing didn't physically wear as much as the earlier shafts did. This means that the repair of these support bearings (the outer two plain bearings in the throttle body) may be all that is needed to correct throttle shaft air leakage issues.

Throttle butterflies can wear and oddly enough the replacement of these with new, stock diameter butterflies will often correct the air bypass issues without resizing the throttle bores which requires over-sized butterflies...all cost adders to a project.

I would contact your service providers to see what they say about their service offerings. Trust me, a set of worn Webers is embarrassing to live with, they don't tune well nor stay tuned.

[BoxsterGT]

Where can I buy new throttle shafts?

Is there a machine shop that makes new ones for oversize throttles?

Same question for oversize throttle plates?

I have a set of MFI throttles & stacks that are corroded, and are a good candidate for rebuilding to oversize. I know some shops like Eurometrix will rebuild them, but I want the components to do this myself.

Can anyone help?

Thanks in advance,

Len

[al lkosmal]

I had Paul Abbott rebuild my 40 IDA's. He did a great job and has several levels of rebuild, depending on the condition of your carbs, budget, etc.

regards,
al