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Offline 18

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arma sportsman
« on: October 17, 2011, 09:16:34 pm »
Hey guys, would anyone mind sharing any build info on a 12.5 briggs for the ARMA sportsman class? Maybe things like who to buy parts from and, is the carb and cam rule a "stock appearing" rule. thank you.
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Offline Rooster

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Re: arma sportsman
« Reply #1 on: October 17, 2011, 09:32:39 pm »
Look in this section for 12hp, or 28 cube...etc, A ton of info in here on Briggs 28 cube flatty.

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Offline 18

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Re: arma sportsman
« Reply #2 on: October 18, 2011, 08:06:38 pm »
Thank you Rooster. The rules appears we can run whatever bore and stroke along cam and valve sizes. If i ran a stock crank and stock replacement piston along with correct balancing can anyone recommend a safe max rpm? I have heard of similar builds with a tillotson carb running around 7000 rpm, does this sound right?
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Re: arma sportsman
« Reply #3 on: October 18, 2011, 08:11:01 pm »
Don't think you want to run the stock rod to 7K! I would keep it under 5500, if that.

In ARMA you won't be running a Tillotson on a Briggs though, Has to be the Briggs carb.
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Offline The Tank

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Re: arma sportsman
« Reply #4 on: October 18, 2011, 08:11:55 pm »
Are you gonna use an ARC billet rod or a stock rod?
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Offline 18

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Re: arma sportsman
« Reply #5 on: October 18, 2011, 08:27:45 pm »
 Billet for sure.  Yeah, i was planning on building a big bore stock appearing carb. What all brand carburetors came on the 28's?
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Offline Rooster

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Re: arma sportsman
« Reply #6 on: October 18, 2011, 08:33:37 pm »
They either had a Flow-jet 1 piece carb and Intake, or a Warlboro carb with a separate intake.

If you are using ARC rod, the stock flatty piston will not work, you need an AVS piston...


But again, all of this has been posted in the flat head section!
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Offline 18

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Re: arma sportsman
« Reply #7 on: October 19, 2011, 12:17:21 am »
Quote from: Rooster on October 18, 2011, 08:33:37 pm
They either had a Flow-jet 1 piece carb and Intake, or a Warlboro carb with a separate intake.

If you are using ARC rod, the stock flatty piston will not work, you need an AVS piston...


But again, all of this has been posted in the flat head section!
yeah, i forgot to mention i will use a  stock briggs avs piston. are there any particular walbro part numbers or series of carbs i should be looking for? hey thanks for the help! 
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Offline Caudy155

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Re: arma sportsman
« Reply #8 on: October 19, 2011, 07:36:12 am »
Carb should have walbro and lmt cast in the side of it
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Offline Ron Atchison/A.C.E. Race Engines

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Re: arma sportsman
« Reply #9 on: October 19, 2011, 09:48:59 am »
  not to hijack this thread but, can anyone give me a part number for the avs piston to fit a standard bore flatty?  thanks, Ron
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