14 August. Friday 2026
Yamaha YZ125 Monster Energy - 2023 Specifications and Reviews
The 2023 Yamaha YZ125 Monster Energy is a lightweight 125cc two-stroke motocross bike designed for junior riders and beginners entering competitive racing. Known for its responsive power delivery and nimble handling, this machine combines a liquid-cooled reed-valve engine with a six-speed transmission to deliver exciting performance on the track while remaining manageable for less experienced competitors.
General information | |
| Category | Cross / motocross |
| Year | 2023 |
| Model | Yamaha YZ125 Monster Energy |
| | |
Engine and Transmission Specifications | |
| Driveline | Constant-mesh |
| Clutch | Multiplate wet clutch |
| Transmission type | Chain (final drive) |
| Gearbox | 6-speed |
| Cooling system | Liquid |
| Lubrication system | Premix |
| Ignition | Digital CDI |
| Fuel system | Carburettor. Hitachi Astemo® Keihin PWK38S |
| Bore x Stroke | 54.0 x 54.5 mm (2.1 x 2.1 inches) |
| Compression | 10.1:1 |
| 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 | Bridgestone® Battlecross X20 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 | Aluminum semi-double cradle |
| | |
Physical measures and capacities | |
| Oil capacity | 0.70 litres (0.74 US quarts) |
| Fuel capacity | 6.81 litres (1.80 US gallons) |
| Wheelbase | 1445 mm (56.9 inches) |
| Ground clearance | 366 mm (14.4 inches) |
| Overall width | 826 mm (32.5 inches) |
| Overall length | 2136 mm (84.1 inches) |
| Overall height | 1295 mm (51.0 inches) |
| Seat height | 980 mm (38.6 inches) If adjustable, lowest setting. |
| Weight incl. oil, gas, etc | 94.8 kg (209.0 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/green |
Maintenance and service data | |
| Fork tube size | 48 mm (1.9 inches) |
| Tire pressure rear | 15 PSI (1 Bar or 100 kPa) |
| Tire pressure front | 15 PSI (1 Bar or 100 kPa) |
| Spark plugs | NGK BR9EVX, NGK BR9EIX |
Performance Profile & Rider Fit
Best For
Track90%
City5%
Cornering88%
Daily Riding5%
Touring5%
Passenger0%
Rider Profile
| Best For | Best suited to intermediate through expert off-road riders who understand two-stroke power delivery and clutch management. |
| Purpose | Built purely for motocross track riding and competitive off-road racing, not general transportation. |
| Rider Fit | Very light and tall with a high seat height, favoring taller, fitter riders comfortable standing and shifting body weight aggressively. |
| Character | A raw, high-revving two-stroke that rewards aggressive riding, precise clutch control, and active rider input over smooth cruising. |
| Not Ideal For | Not suitable for street use, commuting, passengers, or riders seeking comfort and low-maintenance touring capability. |
Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.
Rider Reviews
Total comments: 1
MotorcycleDB Review
I recently had the opportunity to test ride the 2023 Yamaha YZ125 Monster Energy edition and I was thoroughly impressed. The powerful 125cc engine provided fantastic acceleration and the responsive handling made taking on tight corners a breeze. The Monster Energy graphics and special edition styling made this bike stand out from the crowd, and I appreciated the attention to detail in the design. Overall, the 2023 Yamaha YZ125 Monster Energy is a top-notch motocross bike that delivers performance and style in one package. The 2023 Yamaha YZ125 Monster Energy is a game-changer in the motocross world. With its powerful engine, responsive handling, and eye-catching design, this bike has everything a rider could ask for. Whether you're hitting the track or trails, the YZ125 Monster Energy edition is sure to turn heads and deliver thrills. If you're in the market for a high-performance motocross bike with a unique look, the 2023 Yamaha YZ125 Monster Energy is definitely worth considering.Add a Comment
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