> Some background: 1979 MG Midget - single Z-S carb.
> The PROBLEM: It's sucking _way_ too much gas. I can't get the colortune
> -to
> even start to hint at anything but yellow. Obviously the mixture
> -is screwed
> up but I can't seem to fix it.
> I've had the carb and choke apart numerous times and everything seems
> -to be
> OK there (although I freely admit I'm far from an expert on these
> -things).
Well, as I think someone on the list mentioned a while back, there is a piece of
the Z-S 175CD carb. called a temperature compensator or something like that
(I'll have to check the book). It's a plastic and metal device about 2-1/2
inches by 1/2 inch on the side of the carb. Anyway, the Haynes Z-S manual says
to never touch the screw settings inside the thing or it won't work right.
There are some magic settings done at the factory. Of course I took mine
completely apart and cleaned it up when I rebuilt the carbs. and all I got was a
yellow flame from the Colortune. How did I fix it? I pulled the units off of a
couple of spare Z-S 175CD carbs I had lying in the garage. They were all grimy
but I made sure I didn't touch the screws inside and now I get a nice blue flame
from the Colortune. Of course, this was about the same time the right rear
wheel bearing ate itself, so I haven't had a chance to drive it when it was in a
reasonable tune yet, but that's another story. BTW, this was on a '74 TR6. I
don't know if you are having the same problem, but it's something to keep in
mind. Even if you are suffering the same malady, I don't know how you would fix
it other than to keep tweaking the settings until it works, or to find a new
temperature compensator unit that is in a proper state.
-- Jeff
'74 TR6 waiting for a wheel bearing ;-(
Jeffrey_Lo@ccm.hf.intel.com
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