| Specification | Data |
|---|---|
| Model Code | CE16C / B0VB |
| Production Years | 2022 – 2024 |
| Engine Oil | Yamalube 4 (10W-40) / SAE 10W-40 (JASO MA) (0.7 L) |
| Spark Plug | NGK BR9S |
| Tire Size (Front/Rear) | 80/100-21 51M / 100/90-19 57M |
| Tire Pressure | 1.0 bar (15 psi) F/R |
| Battery | N/A (Kickstart Only) |
Engineering Highlight: The 2022 Revolution
The release of the CE16C/B0VB generation marked the most aggressive engineering overhaul for the Yamaha YZ 125 in nearly two decades. While the motocross industry shifted heavily toward four-stroke technology, Yamaha doubled down on two-stroke development by redesigning the entire top end, including a new cylinder, head, and piston. This was not a mere cosmetic update; the B0VB engine features a revised Yamaha Power Valve System (YPVS) and a high-precision Keihin PWK38S carburetor with a solenoid-controlled Power Jet, significantly sharpening throttle response and mid-to-top end power delivery.
Technical Review: Performance and Chassis
At the heart of the CE16C is a liquid-cooled, 125cc reed-valve inducted engine. The 2022-2024 models benefit from a straighter intake path, which optimizes the volumetric efficiency of the combustion cycle. This mechanical refinement is paired with the industry-leading KYB SSS (Speed Sensitive System) front fork, which remains the benchmark for tactile feedback and bottoming resistance in the 125cc class.
The chassis ergonomics were also modernized, featuring a flatter seat and slimmer fuel tank, allowing the rider much greater mobility during aggressive cornering. The braking system saw an upgrade in caliper rigidity and pad surface area, providing the stopping power necessary for the increased velocity of this new generation.
Maintenance Guide: Sustaining Peak Performance
Lubrication System
For the CE16C engine, Yamaha specifies Yamalube 4 (10W-40) or an equivalent SAE 10W-40 meeting the JASO MA standard. The transmission requires exactly 0.7 Liters. Regular oil changes are critical in a high-strung two-stroke to prevent clutch drag and gear wear, especially under racing conditions.
Ignition and Combustion
The NGK BR9S is the required spark plug. Given the high-compression nature of the B0VB engine, ensuring the gap is within spec and the heat range is correct is vital to prevent pre-detonation or fouling. Always inspect the plug color to monitor the air-fuel mixture provided by the Keihin carb.
Tires and Traction
The YZ 125 utilizes a 80/100-21 front and a 100/90-19 rear tire. To maintain a balance between footprint and rim protection, a standard pressure of 1.0 bar (15 psi) is recommended for both ends. Riders may adjust by ±2 psi depending on track density (soft vs. hard pack).
Frequently Asked Questions
Q: Does the 2022-2024 YZ 125 have an electric start?
A: No, the YZ 125 (CE16C/B0VB) remains a dedicated kickstart-only machine to minimize weight and maintain its status as the lightest full-size motocrosser in Yamaha’s lineup.
Q: How often should I change the piston?
A: For competitive racing, Yamaha recommends inspecting the top end every 7.5 to 15 hours. For recreational use, this interval can be extended, but performance will degrade as ring seal weakens.