I agree on the 42. The 45 is made for big time engineupgrades. Go to the Mikuni web site for more info.

 

Just a word of warning tho, your fuel mileage will drop.

 

how bad does the milage drop

 

on my 80 incher evo milage went from 41mpg stock carb to 37 mpg with mickuni but was well worth the milage drop in performance

 

Mine is .010 over 103 kit with ridiculous cams and a 48mm. i get mid to high 20's. The best i ever got was 31. (Of course i weigh a tick over 300lbs, and ride like an idiot.) everyone I've ever talked to though said that mikuni's get between 5-7 mpg less than stockers do.