Lohr's Duncan Yamaha YFZ450
Engine
Tuner: Loren Duncan
Mechanic: Donald Ray Lohr
Displacement: 460cc
Bore x stroke: 97x62mm
Piston: JE
Rod: Knife-forged
Crank: Stock with stock counterbalancer
Porting: DRI with Serdi valve-seat kit
Valves: Oversize stainless steel
Cams: DRI X12
Carburetor: Keihin FCR 39mm; sometimes runs Edelbrock
Radiator: Stock
Ignition system: Vortex
Airbox: Stock with Pro Design Pro Flow Kit
Air filter: Pro Design Pro Flow Kit with K&N
Air-filter cover: NA
Exhaust: Fat Boy 4 Complete Stainless System
Oil: Maxima Premium 4 10w30
Fuel: Sonoco
Drivetrain
Clutch basket: DRI C14 with Hinson basket
Plates: DR-C34 Clutch Kit (includes fiber and steel plates, HD springs)
Springs: Stock
Sprockets (f/r): Sunstar
Gearing (f/r): 15/37
Chain: Tsubaki Omega O-ring
Hubs (f/r): DRI billet-aluminum/Team Industries
Suspension
Front
A-arms: Roll Design Lobo II
Shocks: Custom Axis
Tie-rods: Roll Design
Rear
Swingarm: Roll Design
Shock: Custom Axis
Linkage: StockChassis
Frame: Stock
Frame mods: Gusseted
Steering stem: Roll Design
Axle: Team Industries
Footpegs: IMS/Roll Design
Nerf bars: AC Racing
Bumper: DRI Chrome
Tires & Wheels
Front
Tires: ITP Holeshot MX, 20x7-10
Wheels: Douglas Ultimate
Rear
Tires: ITP Holeshot MX, 18x10-8
Wheels: Douglas Ultimate
Brakes
Calipers (f/r): Stock
Rotors (f/r): Stock
Pads (f/r): Stock
Lines (f/r): DRI Crown
Brake pedal: IMS
Brake fluid: Maxima 550
Controls & Misc.
Handlebar: TAG T2 (CR high-bend)
Grips: TAG
Steering stabilizer: GPR
Cables: Motion Pro
Total cost (approximate): $20,000