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Yamaha YZ450F


The Estenson Racing Yamaha 2021 YZ450F is a production-based motorcycle, and the product of years of testing and development by Yamaha Motor Corporation engineers. The 2021 YZ450F has been redefined with a more compact motor, a thoroughly refined and balanced chassis, and improved ergonomics which will all give the rider the ability to perform at their best while reducing the overall weight. It is similar to what is seen racing in Motocross, but tailored to suit the needs of racing American Flat Track AFT Singles racing. 

Compared to a top-level Motocross machine, one of the key differences is in suspension. It is lowered and re-valved specifically for flat track. The engines are tuned a little more specific for top speed, especially for the fast Mile and Half-Mile tracks. Wheel sizes are different as well. American Flat Track uses 19-inch dirt track wheels shod with dirt track tires for both the front and rear, while Motocross runs a 19-inch rear and 21-inch front with knobby tires. Another visual difference, and quintessentially flat track, is no front brake. The only exception to this rule is when the series races on a TT track.


Model YZ450F
Engine Type 450cc liquid-cooled DOHC 4-stroke, 4 valves
Displacement 450cc
Bore & Stroke 97 x 60.8 mm
Compression Ratio 13.0 : 1
Lubrication system Wet Sump, Yamalube Full Synthetic
Clutch Type Rekluse
Fuel System OEM Standard
Ignition System GYTR Power Tuner
Starter System OEM Electric
Transmission System Constant-mesh 5-speed
Final Transmission 13 / 49


Frame Semi Double Cradle
Chassis OEM Standard
Front Suspension Telescopic Fork
Front Travel 310mm
Caster Angle 26 55’ degree
Trail 120mm
Rear Suspension Swingarm
Rear Travel 315mm
Front Brake Hydraulic single disc brake, Braking 270 mm
Rear Brake Hydraulic single disc brake, Braking 240 mm
Front Tire Dunlop DT4
Rear Tire Dunlop DT4


Overall Length 2185mm
Overall Width 825mm
Overall Height 1285mm
Seat Height 965mm
Wheelbase 1485mm
Minimum Ground Clearance 330mm
Wet Weight 111Kg
Fuel Tank Capacity 6.2 Liter
Oil Capacity 0.90 Liter