14 August. Friday 2026
Yamaha YZ125 - 2012 Specifications and Reviews
The 2012 Yamaha YZ125 is a lightweight 124cc two-stroke motocross bike engineered for amateur and intermediate riders. Known for its responsive reed-valve engine and nimble handling, it excels in competitive racing and training environments. The liquid-cooled single-cylinder delivers punchy power delivery ideal for developing rider skills on various track conditions.
General information | |
| Category | Cross / motocross |
| Year | 2012 |
| Model | Yamaha YZ125 |
Engine and Transmission Specifications | |
| Clutch | Multiplate, wet |
| Transmission type,final drive | Chain |
| Gearbox | 6-speed |
| Cooling system | Liquid |
| Lubrication system | Wet sump |
| Ignition | CDI |
| Fuel system | Carburettor. Mikuni TMX 38 |
| Bore x stroke | 54.0 x 54.5 mm (2.1 x 2.1 inches) |
| Compression | 8.6:1 |
| Engine details | Reed-valve inducted |
| Engine type | Single cylinder, two-stroke |
| Capacity: | 124.00 ccm (7.57 cubic inches) |
| | |
Brakes, suspension, Frame and wheels | |
| Rear brakes diameter | 245 mm (9.6 inches) |
| Rear brakes | Single disc. Hydraulic |
| Front brakes diameter | 250 mm (9.8 inches) |
| Front brakes | Single disc. Hydraulic |
| Rear tyre dimensions | 100/90-19 |
| Front tyre dimensions | 80/100-21 |
| Rear suspension travel | 315 mm (12.4 inches) |
| Rear suspension | Fully adjustable single shock |
| Front suspension travel | 300 mm (11.8 inches) |
| Front suspension | Speed-sensitive system inverted fork |
| | |
Physical measures and capacities | |
| Fuel capacity | 7.95 litres (2.10 gallons) |
| Wheelbase | 1,443 mm (56.8 inches) |
| Ground clearance | 386 mm (15.2 inches) |
| Overall length | 2,136 mm (84.1 inches) |
| Overall height | 1,316 mm (51.8 inches) |
| Seat height | 998 mm (39.3 inches) If adjustable, lowest setting. |
| Weight incl. oil, gas, etc | 94.4 kg (208.0 pounds) |
Other specs | |
| Maintenance | Find parts, fluids, filters, maintenance tools and service items on eBay |
| Color options | Blue/White |
| Factory warranty | 30 Days |
Performance Profile & Rider Fit
Best For
Track85%
City5%
Cornering90%
Daily Riding5%
Touring5%
Passenger0%
Rider Profile
| Best For | This is a full-on competition motocross bike best suited to intermediate through expert off-road riders who understand 2-stroke power delivery and clutch management. |
| Purpose | Built purely for motocross racing and aggressive trail riding, not for commuting, road use, or casual leisure riding. |
| Rider Fit | The tall 38.6-inch seat height, light 212 lb wet weight, and peaky 2-stroke power demand an active, fit rider comfortable standing and shifting body weight constantly. |
| Character | A raw, high-revving 2-stroke racer that rewards precise clutch and throttle control with explosive acceleration and razor-sharp handling on dirt. |
| Not Ideal For | Not for beginners, road riders, passengers, or anyone wanting comfort, storage, or long-distance capability. |
Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.
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