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Yamaha YFZ 450 DRI 450/460cc National Engine Kit - Duncan …
https://www.duncanracing.com/4-stroke-engine/yamaha-yfz-450-dri-national-engine-kit
Duncan Racing's Complete 450cc/460cc Engine Performance Package for the Yamaha YFZ 450. Includes Fat Boy 4 Complete Exhaust System, 450cc or 460cc Forged JE Piston Kit (12-1 compression), Cylinder Bore and ReNikasil Coat, head gasket, Billet Camshaft, HD Valve Springs w/Titanium Retainers, Shortened Bronze Guides, DR Head Porting (with guides out) and Valve …
Yamaha YFZ 450/YFZ 450R Hi Performance Camshafts — Duncan …
https://www.duncanracing.com/4-stroke-engine/289-x12
Yamaha YFZ 450/YFZ 450R Hi Performance Camshafts. 649.95. Note: This is a specialty product and is not currently available for purchase online. Please call Duncan Racing International and a DRI staff member will assist you by collecting the required specifications and …
Yamaha YFZ 450 R '09-'21 Vortex ECU — Duncan Racing
https://www.duncanracing.com/vortex/vtu-374r
Yamaha YFZ 450 R '09-'21 Vortex ECU. 749.95. YFZ 450R ECU in STOCK. #VTU374R- '09-'21 Yam YFZ450R Vortex ECU $749.95. #VT-SW05- Handlebar Switch $69.00 optional. Key Features. • More Power • Smoother Power Delivery. • Pre Programmed with 10 Hi Performance Fuel/ Ignition maps. (maps changed by adjustable dial on ECU)
Yamaha YFZ 450 (Carb) DRI 500cc Big Bore Kit - Duncan Racing
https://www.duncanracing.com/4-stroke-engine/yamaha-yfz-450-carbureted-dri-500cc-big-bore-kit
MODEL: '04-'09 Yamaha YFZ 450 CORES REQUIRED: None OPTIONAL UPGRADES: Crankshaft Balance $275 DISPLACMENT: 500.8 cc (98x66.4 ) COMPRESSION: 13-1 KIT COMPONENTS: 98mm 13-1 Forged Piston kit, Headgasket, Nikasil Coated Big Bore Cylinder, 66.4 mm Stroker Crankshaft NOTES: Kit bolts in, No machining required. Engine must be completly torn down …
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