Mac 101

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Brian Naufzinger
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Vintage Karting items owned: Rupp grand prix
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Mac 101

Post by Brian Naufzinger » Sun Feb 05, 2017 7:44 pm

I'm building a Mac 101 and need ideas on a replacement carburetor.

ted johnson
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Joined: Fri Jun 15, 2007 7:59 am

Re: Mac 101

Post by ted johnson » Sun Feb 05, 2017 8:52 pm

Totally depends on what you're doing. You can replace the BDC Mac carb with either a 34mm Mikuni, or an HR Tillotson. Either will work well. If you replace the manifold, perhaps with a GEM V-12 unit, a pair of 1" Tillotson HL carbs such as HL-250's will run very well indeed. Any of these carbs will perform well on gas, or if modified, on alky. My pal, Charlie, runs his 101D with a V-12 and two alky modified HL-250's. It ran great right off the bat. The engine is internally stock, I just refreshed it with new rings, seals and gaskets. Ted

Rob Voska
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Re: Mac 101

Post by Rob Voska » Mon Feb 06, 2017 7:59 am

Good to see you back on the forum Ted!

ted johnson
Posts: 1685
Joined: Fri Jun 15, 2007 7:59 am

Re: Mac 101

Post by ted johnson » Mon Feb 06, 2017 8:16 am

Thanks, Rob. Gotta see Doc a week from today. He'll tell me where I stand. I'd love to make Tucson at the end of March. Ron is still recovering=g from his foot surgery. Hope to see you guys again one day! Ted

REAR
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Re: Mac 101

Post by REAR » Mon Feb 06, 2017 5:19 pm

Keep in mind what you plan to do with your engine. Seen plenty of good running motors with a 1" single tilloston also.

R.E.A.R.

Brian Naufzinger
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Vintage Karting items owned: Rupp grand prix
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Re: Mac 101

Post by Brian Naufzinger » Mon Feb 06, 2017 11:57 pm

I will be running at Fremont. Like to keep it gas.. I will probably put twinn carbs on but didn't know what tillotson number would be the best.

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

Re: Mac 101

Post by Rob Voska » Tue Feb 07, 2017 8:40 am

Gas or Alky?

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

Re: Mac 101

Post by REAR » Tue Feb 07, 2017 5:17 pm

Look at what these folks have to offer.

https://eccarburetors.com/estore/carbur ... carb-parts

Never ran dual carbs on gas but if you go the alky route the HL-348 series work real well in a dual configuration.

The HR 181 single on gas is a real popular set-up used by many.

R.E.A.R.

Brian Naufzinger
Posts: 6
Joined: Sun Feb 05, 2017 2:27 pm
Vintage Karting items owned: Rupp grand prix
User Agreement: Yes

Re: Mac 101

Post by Brian Naufzinger » Tue Feb 07, 2017 7:08 pm

Ok thanks. What about just one carb using gas?

REAR
Posts: 1221
Joined: Sat Jun 16, 2007 10:19 am

Re: Mac 101

Post by REAR » Wed Feb 08, 2017 5:50 am

Brian,

A HR-181 seems to work real well on a 101 even with the stock manifold and reed cage converted for Tillotson use and this seems to be a very popular single carb set-up.

Call the folks at E.C from the above link and tell them what your doing and ask them what they recommend.

Perhaps others can chime in with their single suggestions.

A word of caution, Be real careful with the Ebay stuff because unless you know who your buying a carb from it can turn into a real crap shoot as to what you really purchased. Don't want to scare you just protect you because the carb is the 'heart' of a 2 cycle engine and you need a good one.

R.E.A.R.

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