TKRJ Piston Kits (Sold each) Yamaha RD350 / RD400 / LC350 - Made in Japan. Piston kit includes cast piston, rings, pin and clips. Designed to meet or exceed OEM specifications. Economy Cycle has tested these pistons for fitment and performance in air-cooled RD's and have performed well with thicker skirts than ProX pistons giving excellent durability. Available sizes are 64.0mm, 64.25mm, 64.50mm, 64.75mm, 65.0mm, 65.25mm, 65.5mm, 65.75mm, 66.0mm. Choose piston size, quantity and click add to cart.