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Unleash the beast within your Yamaha YFZ450 with the premium Big Bore Kit Stage 3 from BPRATV
91002-KRN-851
A: This kit is intended as a stock replacement
Don't let it happen to you
Easy Installation: No need for complex case or head modifications—enjoy simple installation and get back to the trails faster
Best YFZ450 Rebuild Kit Hotcams Kibblewhite Complete Motor Engine Assembly Redo Arctic Cat Unleash the beast within yourWorks on all Yamaha YFZ450 carb models 95mm stock bore cylinder Wiseco JE or CP big bore forged piston Nitirte coated piston rings Chrome wrist pin Circlips Hotrods or Wiseco HD replacement crank with rod Stage 1 Hotcams Kibblewhite lightweight race valve spring kit Kibblewhite White Diamond stainless intake and exhaust valves Kibblewhite Viton valve stem seals Complete gasket kit Cometic MLS head gasket Seal kit Billet water pump impeller and shaft