VERTEX YAMAHA YZ125 05-21 53.94MM REPLICA PISTON KIT

KIT INCLUDES

• Piston
• Piston rings
• Wrist pin
• Wring pin circlips
• Bore Size: 53.94MM
• Compression Ratio: Standard Compression

Manufactured in Italy, Vertex, the premier brand of OEM replacement pistons, is the OEM supplier to KTM and numerous European motorcycle manufacturers. Vertex piston rings are manufactured to the highest standards in Japan, and are produced by the OEM suppliers so that they are direct OEM replacements. Vertex is the choice of those who truly seek the optimum in dirt bike performance.

Because of a cast piston's ability to contain higher silicon content compared to forged pistons, and because two strokes have lower cylinder pressures when compared to four-strokes, cast pistons are ideal for two-stroke engines. Vertex pistons are gravity cast from an aluminum alloy with 18% silicon content. Silicon is important because:

• It decreases thermal expansion, which changes the geometry after the piston reaches operating temperature. With low thermal expansion characteristics, Vertex pistons can be run at tighter tolerances compared to forged pistons. This creates better power and performance, also making them less susceptible to rattling or breaking.
• Silicon gives the pistons better wear characteristics and prolongs piston life by decreasing wear on the piston skirt.

Aiding in the break-in process and reducing wear, every Vertex piston has a Molybdenum Disulphide (MOS2) coating on the piston skirt. All pistons are heat treated with a T-5 or T-6 hardening and tempering cycle.

Note: Image for reference only, product may vary slightly for fitment.

**Please note: It is a necessary requirement to check and measure cylinder size before ordering and fitting pistons. Please adhere to manufacturer recommendations for correct tolerances.