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MG parts spares and accessories are available for MG T Series (TA, MG TB, MG TC, MG TD, MG TF), Magnette, MGA, Twin cam, MGB, MGBGT, MGC, MGC GT, MG Midget, Sprite and other MG models from British car spares company LBCarCo.

MG MG Y Type - H2 throttle spindle fix: bodge or brilliant?

In preparation of some serious summer touring I decided to give the SU H2 carburettor some long overdue attention.

One of the problems was that I wasn't able to get a lean enough mixture at idle. This caused me a lot of head scratching until I discovered that the cork upper jet gland was leaking. The high vacuum at idle sucked extra fuel through the leaking gland. When I tried to get a good mixture at idle I had to lean out the jet to the stop: not good, because this in turn caused a very lean mixture at higher revs. This leakage is now (hopefully) stopped by some high-tech Vitron/teflon rings.

Of course the throttle spindle was worn causing "false air" to be sucked in, again to play havoc with the idle mixture. Normally I would order a new spindle but as I had some H2's for spares I thought I'd investigate the state of their spindles. One was very tight with no play AT ALL. On dismantling I discovered a very nice solution that was probably carried out by a professional in the 60's or 70's.
The original spindles' worn surfaces were turned down on the lathe and in the resultant groove a some kind of flexible bush was fitted, I think it is leather or some other soft fibre. This fits nicely in the original carburettor housing. I think this is a very nice way to fix a caburettor, I know mine is now as airtight as it will ever get. See attached picture.

Willem vd Veer

This thread was discussed on 27/04/2010

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