Weber 38mm Stumble

Any topics pertaining to the BMC A-Series engine.

Weber 38mm Stumble

Postby sg18438 » Thu Jun 21, 2012 9:24 am

I've installed a Weber 38mm "Outlaw" carb in my "61 Bugeye. I have a lightly modified 1275cc motor with a fast road cam, 1.5 roller rockers and and an alloy crossflow head.
The carb idles great and is solid up to about 2500 rpm but tends to stumble, sometimes pretty badly when I'm shifting into the higher gears in the 2500-3000 rpm range. We've installed larger main jets to cure the low rpm stumble and have tried a couple of different size emulsion tubes to fix the higher rpm stumble, we're currently running an F66 emulsion tube.
All the tech info about this carb seems to center on "the off idle" issue...any ideas on solving my problem?
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Re: Weber 38mm Stumble

Postby smaceng » Sun Jul 22, 2012 3:47 am

Everything I've heard about the Weber is that it is a bear to dial in.
There are so many variables, that it is just try and test.
Good luck.
Scott in CA
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