Hi i have a stock 26 zenoah with a racing 257 carb from Gizmos ,tuned pipe (2inch band) from Gizmos and runs very well -- question::- if i was to put a racing wt 1048(from Gizmos) would there much in the way of performance difference as the 257 is 12.7 & the 1048 is 13.5 ?

Thanks for any input

ps im running a cat

Most "racing" 257s are bored out, so it may be the same as the 1048. You'll need to "mike" them to compare, or call gizmo. But the flow improvement is very slight, and a stock 260 won't benefit. But "racing carbs" are sexy!

Our SRI Pioneers are running over 100 MPH on near stock ( 12.7mm. ) 771 carbs. ( just some perspective )