KB410030 Performance, 883-1200 big bore piston kit. +.030"

Boost the performance of your 1986 to 2022 XL883 Sportster with this KB Performance 1200cc conversion kit. These +.030" oversize pistons are designed to work with stock heads, providing a standard 9:1 compression ratio for reliable daily riding. Sold as a set, these pistons are crafted from 390 hypereutectic cast aluminum with a 16% silicone level, allowing for the tight clearances necessary to prevent piston slap and noise. For 2004 and later models, remember that stock 883 cylinders cannot be bored out to 1200cc due to thin liners, so separate 1200cc cylinders are required. This kit is an excellent way to gain the torque of a 1200 while keeping your original heads. Ensure the top compression ring is gapped correctly according to the provided instructions.