2005 Yamaha YZ 250 Technical Analysis & Specification Breakdown
Engineered by Yamaha for the cross - motocross motorcycle segment, the 2005 Yamaha YZ 250 relies on a 249 cc (15.2 cu in) liquid-cooled single cylinder, two-stroke powerplant. Internal engine geometry specifies a bore and stroke of 66.4 x 72.0 mm (2.6 x 2.8 inches) with a 9.1:1 compression ratio.
On the scales, the YZ 250 measures 129 kg (284 lbs) wet (curb). Rider ergonomics and chassis geometry center around a 991 mm (39 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1,486 mm (58.5 in) wheelbase engineered for balanced agility and highway composure. The 7.94-liter (2.1 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Yamaha archive, this model family spans 5 indexed model years from 2002 to 2007, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Standover Height
991 mm (39 in)
Engine
Displacement249.0 ccm (15.19 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Compression9.1:1
Bore x Stroke66.4 x 72.0 mm (2.6 x 2.8 inches)
Valves/Cylinder1
Fuel SystemCarburettor
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
IgnitionDigital CDI
LubricationDry sump
CoolingLiquid
Transmission
Gearbox5-speed
Final DriveChain (final drive)
ClutchWet, multiple discs, cable operated
Chassis
Frame TypeAluminium Bilateral Beam
Rake27.0°
Trail115 mm (4.5 inches)
Front Suspension48mm Kayaba inverted cartridge fork w/adjustable compression and rebound damping
Front Travel300 mm (11.8 inches)
Rear SuspensionKayaba single shock w/adjustable preload, compression and rebound damping separate hi/lo-speed compression adjusters
Rear Travel315 mm (12.4 inches)
Wheelbase1486 mm (58.5 inches)
Ground Clearance335 mm (13.2 inches)
Wheels & Brakes
Front Tyre80/80-21
Rear Tyre110/90-19
Front BrakesSingle disc. Two-piston calipers.
Front Brake Ø250 mm (9.8 inches)
Rear BrakesSingle disc. Single-piston caliper.
Rear Brake Ø245 mm (9.6 inches)
Dimensions & Weight
Dry Weight106.0 kg (233.7 pounds)
Weight incl.129.0 kg (284.4 pounds)
Seat Height991 mm (39.0 inches) If adjustable, lowest setting.
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
