This replacement kit provides everything the enthusiast needs to upgrade their 1000cc Boxer engine, model years 1981 onwards. The kit includes two nicasil-coated cylinders, two forged lightweight pistons along with the required wrist pins, circlips and a full set of piston rings. The cylinders come equipped with stainless steel push-rod tubes already installed - they will never rust. Installation of this upgrade kit will enable a power increase to 67 hp and you should notice smoother running due to the lighter and carefully balanced pistons.