The ROK Shifter was built for drivers who want to race with a gearbox, in keeping with the ROK philosophy of low costs and stable regulations over time. It is ready for 43hp and gives one of the best balances of performance and running costs in shifter karts.
Configurations
The engine comes as a bare engine or as a complete kit with a Dell’Orto VHSH 30mm carburetor, Dell’Orto fuel pump, Arrow intake silencer, molded exhaust and exhaust silencer. Contact us to confirm which configuration you need before ordering.
Features
- Single-cylinder 2-stroke, 125cc, with a 4-reed-valve intake in the crankcase
- Front-clutch 6-speed gearbox with a dry clutch
- Liquid-cooled through an external pump (water pump not included in the kit)
- Cast iron CNC-worked cylinder with 5/3 transfer ducts
- Oval exhaust with 2 boosters
- C4 radial bearings
- PVL analogic ignition and a push-to-start system
- Magnesium engine mount
- Mixture lubrication
See the ROK Cup USA rulebook for the engine rules in your class. Questions about setup? Contact us.
| Type | Single-cylinder, 2-stroke |
|---|---|
| Displacement | 125 cc |
| Bore x stroke | 54 × 54.5 mm (2.126 × 2.146 in) |
| Max power | 43hp @ 13,900 rpm |
| Max rpm | 14,000 |
| Intake | Reed valve (4-reed) in the crankcase |
| Transmission | 6-speed gearbox, front clutch system, dry clutch |
| Cooling | Liquid-cooled, external pump (not supplied in kit) |
| Lubrication | Mixture (premix) |
| Ignition | PVL analogic |
| Starter | Push to start |
| Cylinder | Cast iron, CNC worked, 5/3 transfer ducts |
| Complete kit includes | Dell’Orto VHSH 30mm carburetor, Dell’Orto fuel pump, Arrow intake silencer, molded exhaust, aluminum exhaust silencer, magnesium engine mount |
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