Brand new big bore cylinder / barrel kit to fit:
Aprilia RS4 50 (2011-2017).
This cylinder kit has been manufactured to upgrade the original top end on an Aprilia RS4 50 to 70cc for the years and models shown above. The kit includes the cylinder / barrel / jug, head, piston kit and gaskets.
To upgrade D50B0 or D50B1 2 stroke engine from 50cc to 70cc.
Chassis Prefix: ZD4TK000 / ZD4VX / ZD4TK0008 / ZD4TK0000.