JONSERED 670 CHAMP, 670 SUPER, 625, 625II 50MM PISTON & CYLINDER KIT JONSERED 670 CHAMP, 670 SUPER, 625, 625II, 625 SUPER PISTON AND CYLINDER REPLACEMENT KIT, 50MM, REPLACES THESE JONSERED PART NUMBERS 503172904, 503456102. INCLUDES EVERYTHING IN THE PICTURE TO SUCCESSFULLY OVER HAUL YOUR JONSERED CHAIN SAW, NOTE THE ORIGINAL CYLINDER IS NO LONGER AVAILABLE FROM JONSERED, WE HAVE COME UP WITH A NEW PISTON AND CYLINDER WITH ADDITIONAL PARTS TO SUCCESSIVELY OVERHAUL YOUR SAW, WE HAVE TESTED THESE KITS AND THEY WORK GREAT. THIS KIT WILL WORK WITH YOUR OLD CARBURETOR, NOTE THE CYLINDER HAS THE NIPPLE IN IT TO HOOK UP YOUR IMPULSE LINE FOR THE CARBURETOR TO WORK PROPERLY.