14 August. Friday 2026
Yamaha YZ125 - 2021 Specifications and Reviews
The 2021 Yamaha YZ125 is a lightweight two-stroke motocross bike designed for young riders and those new to competitive off-road racing. Powered by a liquid-cooled 125cc single-cylinder engine with a Mikuni carburetor, it delivers nimble handling and responsive performance ideal for learning technique on the track. Known for its affordable entry price and reliable Yamaha engineering, the YZ125 remains a popular choice in the 125cc motocross class.
General information | |
| Price as new | 3.4 Check out the detailed rating of off-road capabilities, engine performance, maintenance cost, etc. Compare with any other bike. |
| Category | Cross / motocross |
| Year | 2021 |
| Model | Yamaha YZ125 |
Engine and Transmission Specifications | |
| Clutch | Multiplate wet clutch |
| Transmission type | Chain (final drive) |
| Gearbox | 6-speed |
| Cooling system | Liquid |
| Lubrication system | Premix |
| Ignition | CDI |
| Fuel system | Carburettor. Mikuni TMX 38 |
| Bore x Stroke | 54.0 x 54.5 mm (2.1 x 2.1 inches) |
| Compression | 10.7:1 |
| Engine details | Reed-valve-inducted |
| Engine type | Single cylinder, two-stroke |
| Capacity: | 125.0 ccm (7.63 cubic inches) |
| | |
Brakes, suspension, Frame and wheels | |
| Wheels | Dunlop® MX52 tires |
| Rear brakes | Single disc. Hydraulic. |
| Diameter | 270 mm (10.6 inches) |
| Front brakes | Single disc. Hydraulic. |
| Rear tire | 100/90-19 |
| Front tire | 80/100-21 |
| Rear wheel travel | 315 mm (12.4 inches) |
| Rear Suspension | KYB® single shock; fully adjustable |
| Front wheel travel | 300 mm (11.8 inches) |
| Front Suspension | KYB® Speed-Sensitive System inverted fork; fully adjustable |
| Trail | 109 mm (4.3 inches) |
| Rake (fork angle) | 26.0° |
| Frame type | Semi-double cradle aluminium frame |
| | |
Physical measures and capacities | |
| Oil capacity | 0.70 litres (0.74 US quarts) |
| Fuel capacity | 8.00 litres (2.11 US gallons) |
| Wheelbase | 1443 mm (56.8 inches) |
| Ground clearance | 366 mm (14.4 inches) |
| Overall width | 828 mm (32.6 inches) |
| Overall length | 2136 mm (84.1 inches) |
| Overall height | 1295 mm (51.0 inches) |
| Seat height | 975 mm (38.4 inches) If adjustable, lowest setting. |
| Weight incl. oil, gas, etc | 93.9 kg (207.0 pounds) |
Other specs | |
| Maintenance | Find parts, fluids, filters, maintenance tools and service items on eBay |
| Factory warranty | 30 Day Limited Factory Warranty |
| Starter | Kick |
| Color options | Team Yamaha Blue |
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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Rider Reviews
Total comments: 1
MotorcycleDB Review
The 2021 Yamaha YZ125 is a powerful and agile motocross bike that delivers top-notch performance on the track. With its 125cc two-stroke engine, this bike offers excellent power and acceleration, making it a top choice for riders looking for a competitive edge. The YZ125's lightweight chassis and responsive handling make it easy to maneuver through tight corners and tackle challenging obstacles with confidence. Additionally, the bike's suspension and braking systems provide a smooth and controlled ride, allowing riders to push their limits without compromise. Overall, the 2021 Yamaha YZ125 is a fantastic choice for motocross enthusiasts who want a high-performance bike that delivers on the track. In conclusion, the 2021 Yamaha YZ125 is a standout motocross bike that provides impressive power, agility, and handling. Whether you're a seasoned racer or a beginner looking to improve your skills, this bike has everything you need to take your riding to the next level. With its exceptional performance and top-notch features, the YZ125 is a top contender in its class and is sure to impress riders of all skill levels.Add a Comment
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