WK1643 1340 Evo B.T. piston kit. +.030"

This .030 inch oversize Wiseco piston kit is designed for 1984 to 1999 1340cc Evolution Big Twin engines. These forged pistons provide a stock 8.5:1 compression ratio, ensuring your bike retains its original rideability while gaining the durability of forged internals. For those using Screamin' Eagle cylinder heads, the compression will increase to 9.5:1 for a noticeable performance gain. The kit comes complete with Hastings rings, circlips, and wrist pins. Wiseco's forging process ensures these pistons can withstand higher stresses than stock components, making them an excellent investment for any Evo owner performing a top-end service.