Transform your 349cc Stock bore Size from 72 mm to 410cc Big bore 78 mm
This 78mm Big Bore Kit transforms the J-Series engine by dramatically increasing displacement to approximately 410 cc. Users can expect a substantial boost in torque for effortless acceleration and cruising, making the Hunter 350 more comfortable and capable for highway travel.
Stroke: 85.8mm (410cc)
Compression Ratio: 9.5:1 to 9.8:1 – 10:1 (Increase over stock)
Piston Type: Cast Aluminum High-Quality Cast (Based on RE 411 Piston design)
Cylinder Type: OEM Style Barrel New Cylinder Barrel with a new liner (not just rebored)
Optimal performance is achieved with proper ECU tuning (e.g., a Fuel Controller or remap) to match the engine’s increased air flow.
DEVELOPED BY NMW RACING
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