Comparison of Kawasaki KX 250 1990 and Yamaha YZ450F 2012

Attribute	Yamaha YZ450F 2012 ×	Kawasaki KX 250 1990 ×
General
Production from (year)	2012	1990
Make	Yamaha	Kawasaki
Model	Yamaha YZ450F	Kawasaki KX 250
Category	Cross / motocross	Cross / motocross
Engine and transmission
Engine type	Single cylinder, four-stroke	Single cylinder, two-stroke
Valves per cylinder	4	-
Fuel system	Injection. Yamaha Fuel Injection (YFI), Keihin 44mm	Carburettor
Engine details	Titanium valves	-
Displacement (cm³)	449	249
Power (kw)	-	38.3
Cooling system	Liquid	Liquid
Transmission type,final drive	Chain	-
Torque (Nm)	-	47.5
Bore (mm)	97	67.4
Stroke (mm)	60.8	70
Gearbox	5-speed	5-speed
Fuel control	Double Overhead Cams/Twin Cam (DOHC)	-
Ignition	TCI	CDI
Clutch	Multiplate, wet	-
Lubrication system	Wet sump	-
Compression	12.5:1	-
Chassis
Front suspension	KYB Speed-Sensitive System, inverted fork: fully adjustable, 12.2-in travel	Inverted Forks
Rear suspension	KYB Fully adjustable single shock	Monoshock
Front brakes	Single disc. Hydraulic	Single disc
Rear brakes	Single disc. Hydraulic	Single disc
Diameter (mm)	245	190
Front tyre	80/100-21	80/100-21 51
Rear tyre	120/80-19	110/90-19 62
Front wheel travel (mm)	310	310
Rear wheel travel (mm)	315	330
Trail (mm)	-	113
Rake (fork angle) (degree)	-	26.5
Other
Starter	Electric	Kick
Color options	blue/white white/red	-
Dimensions
Wheelbase (mm)	1,491	1,480
Kerb weight (kg)	111.1	-
Dry weight (kg)	-	96
Power/weight ratio	-	0.3969
Overall height (mm)	1,311	1,215
Overall length (mm)	2,195	2,177
Overall width (mm)	826	815
Seat height (mm)	1	-
Ground clearance (mm)	386	385
Performance
Fuel capacity (l)	6.06	8.5