Check the listing for details. KLR 650 685 Big Bore Forged Piston Kit (1996-2018) - Eagle Mfg.. Condition: New. Listed at 369.95 USD. Oversize piston kit, fits 1996 and later KLR650. Forged, lightweight, 2.5mm over stock. Premium rings and wrist pin. Requires cylinder machining. This kit includes required gaskets : head gasket, base gasket, exhaust headpipe crush copper gasket, cam chain tensioner gasket. Lighter and smoother than the factory setup. If you have an oil user this is a good way to go.Improved performance and smoother engine. Much greater difference than expected for a 34cc increase.Note: We are supplying Kawasaki OEM gaskets. The head gasket is cut for the oversize bore. This is the most advanced piston available for the KLR! Gas ports for the top ring, piston lighter than others, broached slots in the wrist pin hole for improved oiling, updated second ring design for oil control. Tightened up tolerances on the ring grooves and accumulator groove to eliminate ring flutter and wear. Premium ring set. The stock ring, piston, wrist pin and circlips weigh 640 grams. This exclusive piston kit weighs 490 grams. This engine setup is much smoother than stock. The next batch with come with spiral type retainers for the wrist pin, since some people are having trouble installing the stronger aftermarket circlips. Brand: Eagle Mfg. - Eagle Mike