View Single Post
Old May 4th, 2017, 12:07 PM   #22
ck.mecha
ninjette.org member
 
Name: Chris
Location: Atlanta
Join Date: Nov 2015

Motorcycle(s): 1969 Benelli Cobra 125, 1970 Honda CB160, 2009 Kawasaki 250R

Posts: 107
Quote:
Originally Posted by Wanderer View Post
Ask yourself why most performance cars today have gone back to a single carb? Yes, gas mileage, but also smaller size engines need a wide power band and not just quicker response. Ask Harley-Davidson.
As you probably know, most new cars regardless of if they are a performance or daily drivers DO NOT use a single carb. They may utilize a single throttle body, but each cylinder gets its own fuel injector - sometimes even two injectors per cylinder. Syncing multiple carb setups really isnt difficult at all.

Also, it seems you are not really comparing apples to apples. By removing just one carb and using one OEM size carb to drive two cylinders the main factor in any low end ridability achieved is the decrease in orifice size and the resulting increase in flow velocity at low engine speeds - not the fact that youre reducing the number of carbs. You could achieve this same result with two carbs, decreasing the carb size. You could even achieve it with 3, 4, or even 10 tiny carbs sized correctly.

For the 250, to cut the flow area in half that would be about a 22mm carb set instead of 30mm.

More power to you though, I hope that you can do it. I would look at using around a 35mm carb if you can find one, it should give you a good compromise on low speed response while not sacrificing too much top end.

Not sure we should ask HD anything... Their newest 1200 makes about 60 ftlb/L (70.8ftlb total) torque while something like the Kawasaki Z900 makes almost 80 ftlb/L (73.1ftlb total).
ck.mecha is offline   Reply With Quote


1 out of 1 members found this post helpful.