2004 Yamaha YZ 125 Technical Analysis & Specification Breakdown
Built around Yamaha's enduro - offroad motorcycle platform, the 2004 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 kg (192 lbs) dry. Rider ergonomics and chassis geometry center around a 992 mm (39.1 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1,438 mm (56.6 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
992 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
Frame TypeFron
Front SuspensionTelescopic fork
Front Travel300 mm (11.8 inches)
Rear SuspensionSwinging arm (Monocross)
Rear Travel315 mm (12.4 inches)
Wheelbase1438 mm (56.6 inches)
Ground Clearance398 mm (15.7 inches)
Wheels & Brakes
Front Tyre80/90-21
Rear Tyre100/90-19
Front BrakesSingle disc
Front Brake Ø250 mm (9.8 inches)
Rear BrakesSingle disc
Rear Brake Ø245 mm (9.6 inches)
Dimensions & Weight
Dry Weight87.0 kg (191.8 pounds)
Seat Height992 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.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
