Mac 49-M/C Info

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Adrian Labetti
Posts: 19
Joined: Sun Sep 25, 2022 10:18 pm
Vintage Karting items owned: Mac 49 M/C powered 1960 Go Kart 800
User Agreement: Yes

Re: Mac 91-M/C Info

Post by Adrian Labetti » Wed Sep 28, 2022 8:52 am

Rob Voska wrote:
Wed Sep 28, 2022 6:50 am
Hard to tell from that picture. Are the mounts welded to the frame or a swing type of mount? Looks like a Go-kart 800 or 1200.
its an 800. the mounts are welded to the frame. i'll send a better pic when i can.

Adrian Labetti
Posts: 19
Joined: Sun Sep 25, 2022 10:18 pm
Vintage Karting items owned: Mac 49 M/C powered 1960 Go Kart 800
User Agreement: Yes

Re: Mac 91-M/C Info

Post by Adrian Labetti » Wed Sep 28, 2022 1:30 pm

Image
Image

More pictures. Starting to think it’s not an mc91. Could be wrong though.

roger santee
Posts: 89
Joined: Mon Jan 28, 2008 7:58 am

Re: Mac 91-M/C Info

Post by roger santee » Wed Sep 28, 2022 8:15 pm

Looks like it might be a 49. Is the head a fixed head or bolted on ? 49 has a fixed head.

Adrian Labetti
Posts: 19
Joined: Sun Sep 25, 2022 10:18 pm
Vintage Karting items owned: Mac 49 M/C powered 1960 Go Kart 800
User Agreement: Yes

Re: Mac 91-M/C Info

Post by Adrian Labetti » Wed Sep 28, 2022 10:02 pm

Seems fixed. still unsure about it being a 49. its what i thouht it was for a while but i looked at the IPLs and there were some pretty major differing factors in the shape of the block and outlines of some gaskets.

**edit**

did some mild research, i think it is a 49. found a 49 block on ebay thats identical to mine. maybe the one in the IPLs was of a different variation or had some minor misprints.
<img src="https://encrypted-tbn0.gstatic.com/imag ... p;usqp=CAU" alt="VINTAGE RACING GO KART NOS McCULLOCH MC49 BLOCK ENGINE CART MINIBIKE PART | eBay"/>

Rob Voska
Posts: 1574
Joined: Fri Jun 15, 2007 9:04 am

Re: Mac 91-M/C Info

Post by Rob Voska » Thu Sep 29, 2022 5:58 am

Is 4.9 cu in not 6.1. Smaller carb and less HP & RPM.

Adrian Labetti
Posts: 19
Joined: Sun Sep 25, 2022 10:18 pm
Vintage Karting items owned: Mac 49 M/C powered 1960 Go Kart 800
User Agreement: Yes

Re: Mac 49-M/C Info

Post by Adrian Labetti » Thu Sep 29, 2022 8:46 am

Now that i know what it actually is, how can i make more power?

Rob Voska
Posts: 1574
Joined: Fri Jun 15, 2007 9:04 am

Re: Mac 49-M/C Info

Post by Rob Voska » Thu Sep 29, 2022 3:20 pm

Buy a 91 series engine and sell the 49'er would be cheaper in the long run.

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