banshee carb will it wrk?

When you fit a Banshee carb, be sure to use the left-hand one with the enrichener (choke) knob. You also have to plug the hole in the side of the carburetor where the choke crossover tube was attached. Otherwise, you'll have a big air leak and the engine won't run well.

In other words, look at your pair of Banshee carbuetors. Only one carburetor has a choke lever on it. The other one (right hand side) has no choke. When starting the engine cold, it gets its extra boost of fuel from the left side carburetor via a rubber tube connecting the two carbs. Unless you plan on installing a jetski-type primer kit, you have to use the right-side Banshee carb on your Blaster or you won't have a choke.

Just FYI.
 
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cool i dident know banshee carbs were 28mm

Banshee carb's are 26mm, not 28mm. Blaster and Banshee carbs are nearly identical except for the small differences between choke systems and the lack of the oil injection nipple on Banshee carbs. Thats not to say that Banshee carbs can't be bored out to 28mm, but they come stock as 26mm.
 
so which will be better to use ?

Keep your stock carb unless it is damaged and can't be used. You won't see any performance gains with a Banshee carb. In fact, your engine won't even run right with a Banshee carb installed unless you change the main and pilot jets first.