Vertex Big Bore Cast Piston 57.96/+4.01 YZ125 (144cc)

• All piston skirts are coated with a hi-tech Molybdenum Disulphite coating for faster break-in time and increased piston life
• Cast Replica piston kits are gravity cast aluminum alloy (not forged) with 18% silicone content, which produces an extremely light but very strong piston
• Forged Replica pistons are forged from 2618 aluminum for superior strength and durability
• Forged High Compression pistons improve power and torque across entire rpm range
• Forged Big Bore pistons increase engine’s displacement, torque, and peak horsepower
• Forged Replica pistons are forged OE replacements
• All pistons are heat treated with a T-5 hardening and tempering cycle
• Replica pistons and all rings are OEM replacements
• Kits include piston, rings, wrist pin and circlips
• Two stroke replacement rings are sold individually (Example if your piston has two rings you will want to order two rings)
• Four-stroke piston rings sold as a set

Piston Versions:

• Cast Replica pistons – Cast OE replica piston
• Cast BB – Big bore stock compression cast piston
• Forged Replica pistons – Forged replacement for a OE cast piston for better strength
• Forged Replica – Forged OE stock compression piston
• Forged BB – Forged OE stock compression big bore piston
• Forged Race – Unique forged GP style race piston with only one compression ring
• Forged HC - Forged high compression pistons
• Two stroke Race pistons – Unique cast GP style race piston with only one compression ring