i put bubs on my '07 america and did not re-jet,,runs fine. got tired of the noise and have new tors now, haven't installed yet, not planning on jetting with them either. i've been through this twice with yamahas fooling with trying to get the right jet in there,,,,and dropping 8-10 mpg. i'm gonna leave well enough alone,,if i want to go faster, i'll ride my adventurer.

some people are like slinkies, they serve no purpose, but, they bring a smile to your face when you push them down the stairs.