Re: Which jet kit to buy - 900RR
Factory Pro in mine--works great.
Helpful advice, get the other mods first, ie pipe, airbox or filter kit, ingition advance what have you, and then work with the jet kit. Any changes or moads relating to air/fuel system will require an adjustment in the jetting to get it to your liking. Be prepared to do some reading and experimenting till you get it right. I just changed full pipe systems again this year from Yosh to D&D again and needed to adjust things. Not real difficult, but will take some of your time to dial it in right.
Once you get what you are going to put on it, post it for some ideas for other's setups.