Are you sure you have all the correct parts? What cylinder are you running? I have boyesen setup on my bike (ESR 330) 38mm air Stryker with no spacer plate at all and it's almost to long.. I have to take my air box off to get the carb to fit between the 2 boots and when it's all back in place it has a slight kink by the rear shock (more then what's supposed to be). My setup fits very TIGHT! Your bike will run fine being spaced back but you will prob Lose a little power compared to what it could produce, but your reeds should last longer