DRIVELINE 421CC BIG BORE ASSASSIN II CYLINDER KIT

$1,190

ASSASSIN-II 68MM NICKASIL BORE 421CC CYLINDER KIT: THESE ARE OUR NEW DESIGN CYLINDERS THE ASSASSIN-2'S. WE TRIED TO MAINTAIN THE SAME STOCK LOOK THAT OUR FIRST GENERATION CYLINDERS HAD WITH LOTS OF INTERNAL UPGRADES TO THE PORT DESIGNS. WE HAVE SET THE PORT TIMING FOR THESE CYLINDERS IN A MODERATE SETTING FOR ANY TYPE OF RIDING OR RACING: EXHAUST PORT TIMING IS: 194 DURATION TRANSFER TIMING IS: 121 DURATION THE NEW CHANGES TO THE CYLINDERS ARE: 1) INTAKE TUNNEL ROOF HAS A SMOOTHER TRANSITION. 2) BOOST PORTS WERE ADDED TO THE INTAKE. 3) THE OUTSIDE CYLINDER AREAS AROUND THE BOOST PORTS WERE FILLED IN SO BOOST PORTS CAN BE MADE LARGER WITHOUT BREAKING THROUGH. THIS EXTRA MATERIAL HAS CAUSED THE USE OF AN ARP NUT ON THE REAR OUTSIDE INTAKE STUD. 4)TRANSFER TUNNELS WERE MADE LARGER AND NOW REQUIRE THE USE OF A CUB BASE GASKET. THE INTERNAL BORE SIDE WALL IS ROUNDED FOR BETTER FLOW. 4A)THE TRANSFER DIVIDER RIB IS SHORTER AND LOWER TO ALLOW FUEL FROM THE BOOST PORTS TO REACH THE FRONT TRANSFER WINDOW EASIER. 5) THE OUTSIDE OF THE CYLINDER AROUND THE TRANSFER PORTS WERE EXTENDED TO GIVE MORE SEALING AREA AND MORE ROOM IF ADDITIONAL PORTING IS DESIRED. 6) THE FRONT TRANSFER WINDOW IS ANGLED FOR BETTER FLOW. 7) THE EXHAUST PORT SHAPE HAS CHANGED FOR MORE AREA AND FLOW. 8) THE TRIPLE PORTS ARE LARGER AND THE TRIPLE TUNNEL WAS INCREASED IN SIZE TO MATCH. Kit includes 2 cylinders - 68MM bore size. 2 Wiseco forged 68MM Blaster style pistons with our custom intake window design, rings, wrist pins and circlips. 2 rubber water jacket plugs. 1 .020" base gasket. 10 stock style head studs.