Check the listing for details. Kveldwulf Yamaha RD350 Top End Rebuild Kit Cylinder Pistons Rings 73 74 75. Condition: New. Listed at 194.50 USD. Kveldwulf Cylinder and Piston Kit for Yamaha RD350. Original US/UK Specification 64mm Bore. The exhaust port is 38mm wide and 29.5mm from the cylinder top. (see pics). Replaces Yamaha 360-11311-00-00 360-11321-00-00 360-11631-03-96 Includes:Left CylinderRight Cylinder2 Pistons2 Sets Piston Rings2 Piston Pins2 Sets Piston Pin Circlip In Stock and Shipped from Texas Warehouse. 1 Year Parts Warranty and No Hassle Returns. We Stand Behind Our Products These can also be used on the 1973-1975 RD250s to give yourself a bit more power. The exhaust and intakes fit. You need to replace the cylinder head studs with the slightly longer ones from the rd350 (4" vs 3.5"). Requires longer head studs when used with RD250 (Yamaha part # 90116-08064-00) Not Included