YZ 125 VRD MOTORSPORT custom insert (for VHM head)

VRD Motorsport Cylinder Head Insert

YZ125 (2022–2026) – VHM Outer Head Compatible

The VRD Motorsport Cylinder Head Insert for the 2022–2026 Yamaha YZ125 has been developed specifically to pair with the VHM outer head, delivering a refined combustion chamber design focused on usable power, reliability, and detonation resistance.

Unlike stock-style inserts that rely on higher compression alone, this insert runs slightly less compression than OEM, combined with a carefully engineered combustion chamber and a 0.9 mm squish clearance. The result is a far more efficient burn, improved flame travel, and significantly better resistance to detonation under load.

This design allows the engine to make stronger, cleaner power across the rev range, especially under hard riding conditions, while maintaining safe operating margins for aggressive jetting and ignition setups.

Key Features

• Designed for VHM outer head
• Fits 2022–2026 Yamaha YZ125
• 0.9 mm squish clearance
• Slightly lower compression than stock
• Optimised combustion chamber geometry
• Improved detonation resistance
• Smoother, stronger, and more consistent power delivery
• Ideal for race and high-performance applications

Why VRD Motorsport?

At VRD Motorsport, every component is developed through real-world testing and performance-focused design. This head insert is built for riders who want reliable power gains, improved engine safety, and a setup that works across a wide range of conditions—not just on paper.