Quote from: Rider414 on September 04, 2013, 11:49:08 am

I want to tell him to throw it away for a Mikuni TM series but I know there are a couple of guys that use the Keihin with good results. 

funny, when i was on 3wheelerworld.com, most of those guys said throw away the tm and run a pwk.

Use what ever brand or model carb that can be tuned to perfection.  The number of tune able circuits and the number of jets, slides, needles that are available from the carburetor manufacture is what influences my choice of carburetors.

If a carb manufacture made a carb that only had one circuit and they only made 2 jets to fit that circuit, it would not take long to find the jet that worked the best for that carb.  The jet that worked the best for that carb does not mean that it was the jet that allows the engine run up to its full potential.

The Mikuni carbs used on dirt bikes typically have three more tuning circuits than the Keihin carbs made for two stroke dirt bikes.  More circuits and more tuning parts in the hands of an experienced tuner usually produces a higher level of carb tuning. 

The air flow rates on the different brands of carburetors are very close to being the same as long as the same size carbs are being compared.  Every carb manufacturer has to have some type of sales gimmick to sell carbs.  Their unique design produces laminar flow, improved throttle response due to bla bla bla.................etc.  Throttle response is more about the ability to tune the carb than it is about the unique design.