Vortex ROK Shifter Engine

Classes: Shifter ROK & Shifter Master ROK

The Rok Shifter engine was born to meet the needs of many drivers who want to compete in a category with the gearbox, but always according to the Rok philosophy: low costs and steady regulations over the time.

The engine has the following features: Single-cylinder 2 stroke engine with 6-speed gearbox with front clutch system, displacement 125 cc, 4 reed valve intake in the crankcase. Liquid-cooled through external pump (not supplied in the kit).

The engine comes in two configurations: bare engine or in a complete kit with Dell’Orto VHSH Ø 30mm carburettor, Dell’Orto fuel pump, Arrow intake silencer, moulded exhaust and exhaust silencer.

Ready for a power of 43 HP, the Rok Shifter is the engine that provides the best combination of performance and operating costs.

Specifications

• Single-cylinder 2 stroke
• Displacement 125 cc
• Reed valve intake in the crankcase
• Liquid-cooled through external pump
• Push-to-start system
• Front clutch six-speed gearbox system
• PVL analogic ignition
• Dry clutch
• Mixture-lubricated
• Cast iron made cylinder CNC worked
• 5/3 transfer ducts intake
• Oval exhaust and 2 boosters

• Radial bearing C4
• Bore and stroke 54×54.5mm
• 43HP at 13.900 Rpm
• Max 14.000 Rpm
• PVL analogic ignition
• Dell’Orto VHSH Ø 30mm carburettor
• Arrow intake silencer
• Dell’Orto fuel pump
• Shifter Rok moulded exhaust
• Exhaust silencer ROK in aluminium
• Magnesium engine mount