With extreme care and a generous dollop of luck, you can rebush them
accurately enough that a reamer is not necessary. What I did :
Clamp a piece of wood to the drill press table, clamp the table in place.
The table has to not be unclamped, so you must leave enough room between it
and the chuck for the following process. Using a long bit, drill a suitable
hole in the piece of wood to take the shank of a center. I used a 5 flute
countersink for a center, since it was what I had. Now chuck up a short
drill bit the same size as the od of the new bushing. ISTR it was 7/16",
but I'm not certain. Measure the required hole depth, you want to leave a
thin wall of original metal between the bottom of the hole and the carb
throat. I used masking tape to mark the drill bit as my stop rod is not
reliable.
Now carefully holding the carb body with one hole engaged on the center on
the table, drill into the body on the other side to the marked depth. Since
you haven't disturbed the table, the holes should be aligned. Smear a
little Loctite on the new bushing, and press it into place (I used my bench
vise with smooth jaws). Enjoy your favorite beverage while the Loctite
sets, and then repeat the process for the other side.
If you can get the new shaft to go into both bushings but it's a bit tight,
you can run it in using a drill motor to turn the shaft. In my case, I
couldn't even get the shaft in place on the first carb, so I borrowed a
5/16" valve guide reamer from a friend and used the shaft of the reamer as a
pilot, by wrapping a few turns of 'scotch' tape around it and running it
through the carb first, then putting a wrench on the other side. My second
carb did not need reaming (or running in) at all.
These were H6, but I believe the HS6 should be similar.
Randall
>
> I have cobbled together the bits and pieces that make up a 4a SU setup, (
> late manifold, HS6s, linkages, bellcrank) and I'm at the point of needing
> to rebush these HS6 carbs.
>
> I've ordered a 'master rebuild kit' which includes stock diameter throttle
> shafts and replacement bushings for the bodies.
>
> I'm aware that Moss offers a reamer, but my understanding is that this
> reams out the existing bushings to accomodate a larger diameter throttle
> shaft. The rebuild kit is supplied with stock bushings and throttle, so
> I'm assuming this is done with some regularity.
>
> I would like to poll the list for the experience anyone has in rebushing
> their carbs.
>
> I recall that just a week or so ago someone mentioned a vendor for a
> reamer similar to the Moss product.
>
> Is this the preferred method? Using a reamer that has a pilot shaft which
> uses the bushing on the opposite side of the body?
>
> Is there such a reamer that retains the stock dimensions?
>
> Can you do it with a drill press and a special size bit?
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