Compare Dirt Bikes

Pick any two bikes to see specs and photos side by side. Differences are highlighted. Blank = not yet verified for that year-model (we don’t guess).

Yamaha

2025 Yamaha YZ450FX

Kawasaki

2025 Kawasaki KX450

Class	450cc 4-stroke	450cc 4-stroke
Displacement	450cc	449cc
Bore × stroke	97 × 60.9 mm	96 × 62.1 mm
Cooling	—	Liquid
Induction	Mikuni fuel injection, 44mm	DFI with Keihin 44mm throttle body
Power valve	—	—
Starter	—	Electric
Transmission	5-speed	5-speed
Front suspension	KYB spring-type fork with speed sensitive damping; fully adjustable, 11.8-in travel	49mm inverted coil-spring fork
Front travel	11.8 in	12 in
Rear travel	12 in	12.1 in
Front brake	270mm	270mm
Rear brake	240mm	240mm
Front wheel	—	21"
Rear wheel	—	19"
Seat height	37.6 in	37.4 in
Wheelbase	57.9 in	58.3 in
Weight	251 lb (Wet weight includes the vehicle with all standard equipment and all fluids, including oil, coolant (as applicable) and a full tank of fuel.)	248.2 lb (curb (with fuel))
Fuel capacity	2.1 gal	1.64 gal
MSRP	—	$10,499

Highlighted (blue) values differ. Verified manufacturer data; see each bike’s page for sources. Torque/fluid specs are on the individual pages (service-manual only).