Author Topic: c/p class clarification  (Read 4247 times)

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Offline tinyt

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c/p class clarification
« on: August 04, 2014, 07:20:11 pm »
i was hoping for some help clarifying the c/p class engine rules.

"Engine must be originally manufactured for use in lawn mowing equipment and be stock in
appearance, with the exception of air filter, air cleaner or velocity
 stack. Crankshaft must be in original orientation and clearance hole in the frame.
 Engine may be internally modified"



now could i put any lawn mower carb on these motors, which brings my next question, would it have to be a stock manifold or could i make one, if not could i weld it or make a carb adapter, what is considered stock appearing? would a valve cover spacer or billet valve cover be not stock appearing, what if i were to paint a valve cover spacer, wouldnt that "appear" stock. the reason i ask this, is we tractor pull and have alot of r&d in are kohler carbs, and would like to put one on a kohler command single ohv engine in this class, but i am not sure if that would be legal, i just find a hard time interpreting the rules, they seem so veg, any help would be appreciated, i am not trying to cheat, i would just like to know what is considered stock appearing, in my eyes a stock kohler k series carb would look stock, the adapter could probably be a 1/4" thick and i would think that would fit with in the rules, but i am not 100%.

Offline Jeff Digou (Pitguy)

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Re: c/p class clarification
« Reply #1 on: August 04, 2014, 07:53:31 pm »
stock manifold and carb  to the motor you have.   Making a plate would not be legal     Kolhler carb on a kohler motor 

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Offline tinyt

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Re: c/p class clarification
« Reply #2 on: August 04, 2014, 08:01:15 pm »
As long as it is a carb made by the kohler, id imagine if i got the k series kohler carb to fit on the command manifold, that wouldnt be a problem, i am.sure it would only be a mater of enlarging the carbs bolt holes, that wouldnt be crossing the line right? I am.sorry if my questions seem dumb, i just want to be certain.

Offline Jeff Digou (Pitguy)

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Re: c/p class clarification
« Reply #3 on: August 04, 2014, 08:18:05 pm »
How much of a difference between a k series carb and a command carb ? 

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Offline tinyt

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Re: c/p class clarification
« Reply #4 on: August 04, 2014, 09:02:01 pm »
Not sure but a stock k series carb is around 1.0 venturi and 1.25 butterfly

Offline Rooster

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Re: c/p class clarification
« Reply #5 on: August 05, 2014, 11:44:05 am »
stock manifold and carb  to the motor you have.   Making a plate would not be legal     Kolhler carb on a kohler motor 


Notice "To the Motor you have"..."Kohler carb on a Kohler motor" is not completely Accurate...

I am not a Kohler know it all by any means. But I do not believe Kohler ever put the K Carbs on the Commands?

If the Carb was not used on the engine that you are running, it is not legal. So for your Application it would have to be Command OHV Single carb on a Command OHV Single engine.

If you want a for sure and definite answer, you can get ahold of Manny Torres Or Kerry Evans through letsmow.com and they can give you an official rulling.

Adapters, extensions, custom intakes and recast parts are not allowed!! With the exception of Air cleaner adapters.

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Offline Cromwell C4

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Re: c/p class clarification
« Reply #6 on: August 05, 2014, 01:03:35 pm »
Several respected US veteran racers are running the Kohler/ Carter K series carbs on the Kohler command single in the CP class, and they are legal. As long as the carb is made by the same manufacturer as the engine, it is legal to use. If this wasn't true, you wouldn't be able to run the vanguard nikki/tikki v-twin carb on the intek v-twin, or the EC two barrel carbs on the intek or any other engine for that matter. Also, several people run the bigger 17hp Tecumseh plastic bowl carbs on the 8/10hp Tecumseh AP engines, all legal, and the list goes on from there... And as far as intakes and adapters, Kohler command OHV single cylinders don't even have an intake manifold. There is only a 3/4" plastic spacer/insulator between the carb and head. As long as its a Kohler manufactured carb, you are good to go.
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Offline more4les

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Re: c/p class clarification
« Reply #7 on: August 05, 2014, 01:13:17 pm »
There is only a 3/4" plastic spacer/insulator between the carb and head. As long as its a Kohler manufactured carb, you are good to go.

Same holds true for the Kawasaki FC540V.

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Re: c/p class clarification
« Reply #8 on: August 05, 2014, 02:47:04 pm »
Several respected US veteran racers are running the Kohler/ Carter K series carbs on the Kohler command single in the CP class, and they are legal. As long as the carb is made by the same manufacturer as the engine, it is legal to use. If this wasn't true, you wouldn't be able to run the vanguard nikki/tikki v-twin carb on the intek v-twin, or the EC two barrel carbs on the intek or any other engine for that matter. Also, several people run the bigger 17hp Tecumseh plastic bowl carbs on the 8/10hp Tecumseh AP engines, all legal, and the list goes on from there... And as far as intakes and adapters, Kohler command OHV single cylinders don't even have an intake manifold. There is only a 3/4" plastic spacer/insulator between the carb and head. As long as its a Kohler manufactured carb, you are good to go.
Well if everyone is doing it I guess it's legal?
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Offline tinyt

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Re: c/p class clarification
« Reply #9 on: August 06, 2014, 09:24:46 am »
Well thank you very much for clearing that up.

Offline Rooster

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Re: c/p class clarification
« Reply #10 on: August 06, 2014, 09:33:13 am »
LOL...lets just say the USLMRA rules are...ummm...Fundamental ;)
Bert stole my cookies!!
 I think he used them to bribe Ed into something naughty?

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