KB272040 Performance, 883-1200 big bore piston kit. +.040"

This KB Performance big bore kit is the ideal choice for converting an 883 Sportster to 1200cc. Sold as a set in a +.040" oversize, these pistons feature a dish head that provides a 10:1 compression ratio with stock heads. Built from T6 heat-treated 390 hypereutectic cast aluminum with 16% silicone, they are designed for tight clearances and minimal noise. This kit fits 1986 to 2022 Harley-Davidson Sportster 883 models. Proper installation requires providing additional clearance for the top compression ring. For owners of 2004 and later 883 models, please remember that the stock cylinder liners are too thin to bore to this size, necessitating the purchase of 1200cc cylinders.