The junior step in the Rok Cup
Rok GP Junior
- Displacement
- 125 cc
- Cooling System
- Liquid-cooled through external water pump
- Max Torque
- 20.2 Nm at 11,500 Rpm
- Bore and stroke
- 54.07x54mm
Exclusive UAE distributor since 2013
Rok GP Junior is the junior-class 125cc engine in the Rok Cup line, built with a reed-valve crankcase, external-pump liquid cooling, a balancer shaft to cut vibration and a power valve for stronger low-rpm pull. It ships complete with a 30mm Dell'Orto carburettor and fuel pump, an Arrow intake silencer, and a moulded exhaust with its own silencer and wiring.
Specifications
| Specification | Value |
|---|---|
| Displacement | 125 cc |
| Engine | 2 stroke |
| Cooling System | Liquid-cooled through external water pump |
| Exhaust | Oval exhaust and 2 boosters; Rok GP moulded exhaust with integrated exhaust silencer |
| Bearings | Radial bearing C4 |
| Bore and stroke | 54.07x54mm |
| Max Torque | 20.2 Nm at 11,500 Rpm |
| Max | 15,000 Rpm (electronically limited) |
| Ignition | PVL digital ignition |
| Carburettor | Dell'Orto VHSH Ø 30mm |
| Silencer | Arrow intake silencer |
| Fuel Pump | Dell'Orto |
| Homologation fiche (PDF, 2026) | https://download.otkkartgroup.com/rok/2026/1_Rok%20Gp%20Junior_%202026_rev01.pdf |
Specifications and photos from OTK Kart Group / Vortex Engines, checked on 27 September 2026. Descriptions written by Scuderia General Trading.
Buy the Vortex Rok GP Junior on kartshop.me
Genuine Vortex engines, stocked in Dubai, on our online store.
