You cannot just change a setting and make carbs work right.
They must be re jetted AND have adjustments made.
All carbs can be made to have instant and perfect throttle response.
Some carbs are more time consuming to do because during certain
years the EPA made new rules and modifications that were made at the
last minute and not worked out very well.
They can still be made to work right.
The intake and exhaust put on a motorcycle will change the jetting requirements.
Some of the newer motorcycles have things worked out very well.
Some are a mess.
The 1977-78 CB750 was a model that was not very well worked out before mass production.
The stock air filter on those bikes were like a giant choke to richen up the mixture.
The air opening on the air box was only 1 inch by 3.7 inches or 3.7 sq inches of area!
The area of the 4 carbs added together is much larger.
So if your remove the stock air box and put on a less restrictive exhaust then you will
have to give the engine more fuel to work properly.
You can easily prove this by running the stock jets on a bike with modified intake and exhaust.
Just putting the choke on and observing the improved throttle response.
A Kawasaki 1500 V twin has a stock air box with eight 90º bends
and one 180º bend in its intake system! Makes it very quiet, but a loss of about 8-9 horsepower.
On a Roadstar Adventure.
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