Mc 91 production year

Post all your vintage karting messages here in the General Discussion Forum

Moderator: Rob Voska

Post Reply
Mark Poos
Posts: 75
Joined: Sat Dec 01, 2018 11:16 pm
Vintage Karting items owned: Bug , Dart, margay expert
User Agreement: Yes
Location: Gilbert Arizona

Mc 91 production year

Post by Mark Poos » Wed Mar 13, 2019 10:20 pm

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?
Attachments
1552529602225-1833051568.jpg

REAR
Posts: 832
Joined: Sat Jun 16, 2007 10:19 am

Re: Mc 91 production year

Post by REAR » Thu Mar 14, 2019 6:49 am

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.

Rob Voska
Posts: 1446
Joined: Fri Jun 15, 2007 9:04 am

Re: Mc 91 production year

Post by Rob Voska » Thu Mar 14, 2019 9:00 pm

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.

Post Reply