Dolmar 7900, Wacker BTS Cylinder Kit 54mm Big Bore This is a new aftermarket cylinder kit for a Dolmar 7900 big bore, also fits the Wacker concrete saw BTS series and a bargain at this price. Kit includes every thing in picture, is a 54mm piston. These pistons are good quality, I have fitted many myself. Any Questions just ask. DO-CYLK-7900