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Mc 91 production year

Posted: Wed Mar 13, 2019 10:20 pm
by Mark Poos
wondering what year the Mac 91 came out and what year mine was produced . Looks to be all original, is that the original carb looks kind of big.. how many cc's were these. Around how many horsepower are they? And how many RPMs can I expect after it's been rebuilt?

Re: Mc 91 production year

Posted: Thu Mar 14, 2019 6:49 am
by REAR
Mark,

First series of 91's came out around 1966. Can't see the carb in your photo but they did have one big single from the factory.

R.E.A.R.

Re: Mc 91 production year

Posted: Thu Mar 14, 2019 9:00 pm
by Rob Voska
Beware! Iif it's the early straight bore without a venturi they are not very desirable & lean out a lot on high end.
Not sure but I was told they didn't pull well off the bottom either. They were quickly replaced.