Please select make, model and yearBig Bore Kits
High quality off road big bore kits.
EMILY in IL
my husband locked up the motor on his quad and well needless to say a new engine is costly and a used one for the prices we could find wasnt very practical, he wanted to make sure he knew what was in his engine and what had been done to it, so we went the rebuilding road and this kit made things alot easier. We didnt have to find someone to bore out his motor wich where we live is kinda hard to do. so he got more power without cleaning out the bank account!Read All Reviews
Mike in ID
I WAS A LITTLE SCEPTICAL ABOUT THIS PRODUCT. HOW COULD MOVING THE MOTOR 2.5mm MAKE THAT MUCH DIFFERENCE? AFTER READING SEVERAL REVIEWS ON LINE AND IN MAGAZINES I DECIDED TO GIVE IT A TRY. I COMBINED THIS PRODUCT WITH A MAXISS EN FRONT TIRE AND WOW WHAT A DIFFERENCE. I AM 250 lbs AND DIDN'T HAVE NEAR THE TROUBLE WITH THE "DARTING" THAT ALOT OF OTHER YZ OWNERS COMPLAIN ABOUT. THIS TOOK ME FROM REALLY LIKING MY BIKE TO LOVING IT. DON'T HESITATE. JUST BUY IT. INSTALL WAS FAIRLY EASY USING THE VIDEO ON THE DRD WEBSITE.Read All Reviews