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SU carb rebuild 444-544

posted by  Phil S. on  Sun Feb 6 13:36 CST 2005
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last visit: Fri Oct 24 13:18 CST 2014
[RELATED]

Belinda, if the bent damper was causing a piston to hang in the up position, that would surely get you some raw gas lighting off in the exhaust. Be sure they drop cleanly after you push them all the way up by hand (and any oil that comes out the top vent when you do this is excess, BTW -- that's as much oil as they need).

20W oil is a reasonable choice. The heavier the oil, the more enrichment you get upon initially opening the throttle. This is what SUs do instead of having accelerator pumps.

Ideally the springs should be the same, of course, but it's not super-critical. You can try stretching the weaker one out a bit.

If you set the mixture for best idle (fastest, smoothest), DX needles will surely be quite rich at speed on a stock B18. I'd try ZH needles (this is off the top of my head, but I think those are stock for B18D).






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