Beloved Leader wrote:
Dave Plowman (News) wrote:
Then presumably has an adjustment for the idle mixture?

Yes, but they're sealed. Federal law and so forth. I mean, no one would
ever know, but to get at the idle mixture adjustment screws, I'd have
to take the carburetor off and drill out the sealing plugs. There are
quite a few connections to the carburetor, so its removal is a major
undertaking.

I didn't have much trouble fixing my Toyota's carb and got only 2 of
its 14 vacuum hoses wrong (taking clear photos or making sketches is a
good idea). The instructions included with the aftermarket rebuild kit
were better than those found in Chilton and Haynes manuals and almost
equal to the factory manual (but there's a book specifically about
Rochester carbs that's probably better than anything). OTOH
aftermarket rebuild kits may be noticeably inferior in quality, and
with my first kit, by Tomco, the rubber parts turned rock hard after
five years, and the float valve clogged because it lacked a filter
screen to trap the bits of rubber that flaked off the fuel line. The
float valve clogged as a result, yet Tomco advertrised that its float
valves were more clog resistant than others'.

I was to told to not disassemble the carb any further than necessary.
For example, the choke and throttle plates should be left alone, as
should any adjustment screws, but if it's necessary to touch the
latter, count the exact number of turns of their original settings
because a lot of times there's no simple way to adjust them correctly,
i.e., to set the idle mixture you may be instructed to use an exhaust
gas analyzer.