Please select make, model and yearBig Bore Kits
High quality off road big bore kits.
WILLIAM in CA
With the Athena kit it's a whole 'nother bike! Roll on the power in 3rd and lift the front wheel. Power is smooth and she pulls right up to the rev limiter. Install was easy. Ceramic coated piston, quality gaskets. Excellent Product!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