Brand new Hyway POP UP extra compression Big Bore piston kit. Fits Stihl chainsaw models MS660 and 066, 56mm Big Bore size.

The kit includes 56mm big bore POP UP piston, Caber piston rings (made in Italy, these are an upgrade over the Hyway rings), wrist pin, and circlips.

Do you want to add power to your saw without spending money on expensive porting? This POP UP extra compression piston from Hyway will generally add at least 10 psi compression over the stock design piston. More compression equals more power. Caber piston rings are the best you can get and ensure reliable performance. 

1 year warranty against defects on this Hyway piston kit.

Please ensure you have a big bore 56mm cylinder on your saw before ordering this piston kit, if you have the stock 54mm size we have a POP UP piston for those available in a separate listing.

Wolf Creek Saw Shop is a proud U.S. seller, we ship within 1 day of receiving payment, and you will get your parts quickly!