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MG MGB Technical - SU rebuild

I need to rebuild my HS4s, the throttle spindles have a fair amount of play.
Turners carbs offer a complete rebuild for about £250 on your own carbs, or replacements without the linkage. Anyone used them?

http://www.su-carbs.co.uk/
c cummins

That is expensive. A re-build kit from Burlen will cost a fraction of that, is an easy project and all you need is some carb cleaner, some scotch brite and a stiffish brush.
The play in the spindles will be almost entirely wear on the spindle itself, the new spindles in the service kit will solve that. You also get new jets, needles, valves, springs, butterfly and all gaskets and washers etc.,, plus detailed instructions.
Allan Reeling

Thanks Allan, I'm still tempted to go for a recon pair, I want new springs, needles and floats as well.

I found the MGB Hive do them £199 exchange. I just don't want to find I need to rebush, because I can't do that.
c cummins

I re-built my carbs with a simple rebuild kit. As Allens states really not all that tricky, and it really does transform the running if there was a lot of wear in the spindles. The extra pieces like floats and valves do not bump the cost up too much either. Mike
J.M. Doust

I rebuilt my HS-4's with new spindles, jets, and the like. The new spindles restored the clearances quite well and the carbs are now much easier to tune. Obviously there is some wear in the bushes but in my case it wasn't too much.

I'd be tempted to try the new spindles etc. and not rebush.

Good luck.

Bob.
Robert McCoy

I rebuilt mine, complete with bushes, a few months ago. No big drama.

Here is a write up, on Paul H's website.

Cheers

Herb

http://www.mgb-stuff.org.uk/recosu.htm
Herb Adler

Herb,
The process is spot on, except, never rely on a drill to produce an accurate hole! Reamers do that!
Al
Allan Reeling

"never rely on a drill to produce an accurate hole! Reamers do that!"

I'd always found drills produce a 3-cornered hole, and thought it was down to my tools or (lack of) technique. Then many years later I was watching a program about the restoration to flying condition of 'Little Nellie' the autogyro used in the James Bond film 'You only live twice'. The aviation expert said all the holes must first be drilled two sizes under, then one size under, then reamed, "otherwise you get three-cornered holes". I felt much better after that.
PaulH Solihull

A twist drill in anything thinner than about 3mm will produce a hole that looks like a W*nkel rotor. To drill a reasonably round hole in sheet you should use a drill with no, or a reverse twist. These work better on brass as well. Even a new twist drill in thicker material is not particularly accurate, and a blunt drill will go all over the place. A hand sharpened drill will have uneven cutting angles and lip lengths, both faults cause over-size drilling.
If you want an accurate hole, drill under-size and ream, as Paul said.
Allan Reeling

This thread was discussed between 01/05/2012 and 06/05/2012

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