Vortex Rok Shifter Engine

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.

See the ROK Cup USA Rulebook for complete rules and regulations concerning engines for a particular class.

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