so i am sort of feeling out a new carb for 1992 lt250r.

 im looking at the new tillotson hw-24a.  the venturi size is 32mm and the main bore is 36mm.

i think it is about right for the rpms we are pulling. maybe a little smallish but close enough. remember this is so it will generate a few hundred more rpms than a slide carb at the same size.

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i get huge swings in temperature here seasonal and daily.   

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i just need confirmation it will generate enough rpm for a shearer pipe setup.

so i am sort of feeling out a new carb for 1992 lt250r.

 im looking at the new tillotson hw-24a.  the venturi size is 32mm and the main bore is 36mm.

i think it is about right for the rpms we are pulling. maybe a little smallish but close enough. remember this is so it will generate a few hundred more rpms than a slide carb at the same size.

--------
i get huge swings in temperature here seasonal and daily.   

-------
i just need confirmation it will generate enough rpm for a shearer pipe setup.

Carburetors that have a "bomb" site (fuel discharge ring) in the venturi  and a butterfly shaft have really good fuel atomization but the air flow is really hindered as compared to a conventional slide type carb.  We have used a lot of these carbs out of necessity on the racing go karts and jet skis engines we build. 


I has been a lot of years since I have done any flow testing on a pumper carb that small.  I think that you will find that it will need a pumper carb around 38 to 40mm to have equal the air flow of a 34mm slide type carb. 

An engine needs a certain amount of air flow to make a desired amount of power.

Air flow = power.

Fuel atomization = fuel milage, and tunability/rideability