TKRJ Yamaha RX100 Piston Kit 1.00 AY0444X

Legendary Performance Reborn: TKRJ Yamaha RX100 Piston Kit (1.00mm Oversize)
Bring the "Pocket Rocket" back to life with the precision of Japanese engineering.

The Yamaha RX100 is a 2-stroke legend known for its high-revving soul and unmistakable exhaust note. When your cylinder shows signs of wear or loss of compression, the TKRJ Piston Kit (1.00mm Oversize) is the professional’s choice for a top-end rebuild. Manufactured in Japan to exacting standards, this kit provides a factory-perfect fit that restores the snappy throttle response and reliable power the RX100 is famous for.

Why TKRJ is the Gold Standard for RX100 Restorations:
Japanese Casting Excellence: TKRJ pistons are engineered to match the original Yamaha thermal expansion characteristics. This prevents "seizing" during high-heat operation while maintaining a tight, high-compression seal.

1.00mm Oversize (4th OS): Perfect for cylinders that have significant wear or scoring. This 1.00mm jump allows a machinist to bore out the sleeve to a fresh, perfectly round surface, effectively giving your engine a "second life."

Optimal Port Timing: Unlike generic "will-fit" pistons, the TKRJ skirt and crown geometry are precision-cut to align perfectly with the RX100’s transfer and exhaust ports for maximum scavenging efficiency.

High-Durability Ring Set: The kit includes premium Japanese rings designed to break in quickly against the cast-iron sleeve, ensuring long-term durability and minimal carbon buildup.

Lightweight & Balanced: Every gram matters in a high-RPM 2-stroke. This piston is balanced to reduce crankshaft vibration, leading to a smoother ride and longer bearing life.

Specifications at a Glance:
Compatibility: Yamaha RX100 (All years)

Size: 1.00mm Oversize (Bore Size: 51.00mm)

Code No: AY0444X

Origin: Made in Japan

Kit Includes: 1 Piston, Piston Rings (Standard & Expander), Wrist Pin, and Circlips.