Datasheet:

Single-cylinder 2 stroke engine with six-speed gearbox
Displacement 125 cc
Cast iron liner
43 Hp at 13900 rpm
PVL analog ignition
Mixture-lubricated
External pump liquid cooled system
Dell'Orto carburetTor 30mm diameter
Intake reed valve in the crankcase
Number of transfer ducts: 5/3
Bore-stroke 54 x 54,5 m
Front clutch gear shift
Dry clutch
Oval exhaust with 2 boosters
C4 radial-bearings
ONE-PIECE Rok exhaust

By the arrival of the new Rok Shifter, the Rok engine family is enriching. The new gear box engine completes the extraordinary Rok engine range.
Rok Shifter comes to the light to accomplish the needs of those several drivers who wish to compete in a category with the gear box, in a well-known and very well managed championship such as the Rok Cup, facing affordable expenses and steady regulations in the time. Rok Shifter engine comes from the long standing and winning Vortex experience in the field with the two-stroke-kart engines and just after the many times winning RVXX 125 engine.
Rok Shifter has been conceived and realized with the aim of starting a dedicated championship, the Rok Cup Shifter, where all drivers will compete by means of this precious jewel made in Vortex, mounted on chassis of different brands. With a displacement of 43 HP, the Rok Shifter is the best engine offering good performances and operating costs.