14 August. Friday 2026
Yamaha YZ125 Monster Energy - 2025 Specifications and Reviews
The 2025 Yamaha YZ125 Monster Energy is a lightweight motocross machine engineered for competitive amateur and intermediate riders seeking aggressive performance. Powered by a potent 125cc two-stroke single-cylinder engine with reed-valve induction, it delivers responsive power delivery and nimble handling ideal for both track racing and off-road training. Known for its proven reliability and affordable entry point into serious motocross competition, the YZ125 remains a class standard for developing rider skills and speed.
General information | |
| Color Options | Team Yamaha Blue/green/white |
| Price | US$ 7299. MSRP depends on country, taxes, accessories, etc. |
| Category | Cross / motocross |
Engine and Transmission Specifications | |
| Starting | Kick |
| Clutch | Multiplate wet clutch |
| Final Drive | Chain (final drive) |
| Gearbox | 6-speed |
| Cooling System | Liquid |
| Ignition | Digital CDI |
| Induction | Carburettor. Hitachi Astemo® Keihin PWK38S carburetor |
| Bore x Stroke | 54.0 x 54.5 mm (2.1 x 2.1 inches) |
| Compression Ratio | 10.1:1 |
| Engine Details | Reed-valve-inducted |
| Engine Type | Single cylinder, two-stroke |
| Capacity: | 125.0 ccm (7.63 cubic inches) |
Physical measures and capacities | |
| 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. |
| Wet Weight | 94.8 kg (209.0 pounds) |
| | |
Yamaha YZ125 Monster Energy dimensions and frame | |
| Wheels | Bridgestone® Battlecross X20 tires. |
| Rear Brakes | Single disc. Hydraulic. |
| Brake Disc Diameter | 240 mm (9.4 inches) |
| Front Brakes | Single disc. Hydraulic. |
| Rear Tyre | 100/90-19 |
| Front Tyre | 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) |
| Frame | Aluminum semi-double cradle |
| | |
Other specs | |
| Maintenance | Find parts, fluids, filters, maintenance tools and service items on eBay |
| 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 |
| Brake fluid | DOT 4 |
| Update specs | Report missing specs or required updates. |
| Warranty | 30 Day Limited Factory Warranty |
| Oil capacity | 0.70 litres (0.74 US quarts) |
| Rake (fork angle) | 26.0° |
| Driveline | Constant-mesh |
| Year of manufacture | 2025 |
| Motorcycle name | Yamaha YZ125 Monster Energy |
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.
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