2002 Yamaha YZ 125 Technical Analysis & Specification Breakdown
Positioned in Yamaha's cross - motocross motorcycle lineup, the 2002 Yamaha YZ 125 pairs a 124 cc (7.6 cu in) liquid-cooled single cylinder, two-stroke architecture with road-focused gearing. Internal engine geometry specifies a bore and stroke of 54.0 x 54.5 mm (2.1 x 2.1 inches) with a 8.7:1 compression ratio.
On the scales, the YZ 125 measures 87.5 kg (193 lbs) dry. Rider ergonomics and chassis geometry center around a 994 mm (39.1 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1,444 mm (56.9 in) wheelbase engineered for balanced agility and highway composure.
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
994 mm (39.1 in)
Engine
Displacement124.0 ccm (7.57 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Compression8.7:1
Bore x Stroke54.0 x 54.5 mm (2.1 x 2.1 inches)
CoolingLiquid
Chassis
Front Travel300 mm (11.8 inches)
Rear Travel315 mm (12.4 inches)
Wheelbase1444 mm (56.9 inches)
Ground Clearance400 mm (15.7 inches)
Wheels & Brakes
Front Tyre80/100-21 51M
Rear Tyre100/90-19 57M
Front BrakesSingle disc
Front Brake Ø250 mm (9.8 inches)
Rear BrakesSingle disc
Rear Brake Ø245 mm (9.6 inches)
Dimensions & Weight
Dry Weight87.5 kg (192.9 pounds)
Seat Height994 mm (39.1 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.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
