Model JET SKI ULTRA 310R (JT1500NKF) Engine Type Supercharged Intercooled, 4-stroke In-Line Four Displacement 1498 cm³ Bore X Stroke 83 x 63.2 mm Compression Ratio 8.2 : 1 Valve System DOHC 4 valve per cylinder Fuel System Electronic Fuel Injection: ø60 mm x 1 Ignition Battery Coil (Transistorised Ignition) Starting Electric Cooling Inducted water Drive … Continue reading Ultra 310R – Specifications