KB305005 Performance, 1340cc Evo B.T. pop-up piston kit. +.005"

For 1984 to 1999 1340cc Evolution Big Twin riders seeking higher compression, this KB Performance pop-up piston kit is a perfect fit. Sold as a set and oversized by .005 inches, these pistons feature a domed head design that achieves a 9.5:1 compression ratio. They are manufactured from T6 heat-treated 390 hypereutectic aluminum with 16% silicone, allowing for the tight clearances that result in a quiet engine and long-term durability. Please ensure the top compression ring is gapped with the additional clearance required by the manufacturer. This kit is a great way to wake up an Evo motor during a top-end rebuild.