Honda CRF450R engine is a high-performance, single-cylinder, four-stroke motocross engine often adapted for kart racing due to its reliability and power. This setup can push a shifter kart to 0–100 km/h in under 4 seconds and reach top speeds around 130–150 km/h on long straights.

🏁 Engine Specifications

• Type: Liquid-cooled, 4-stroke, single-cylinder

• Displacement: 449 cc

• Bore x Stroke: 96.0 mm x 62.1 mm

• Compression Ratio: 13.5:1 (varies slightly by year)

• Valve Train: Unicam® SOHC, 4 valves (Titanium intake & exhaust)

• Fuel System: Programmed Fuel Injection (PGM-FI), 46 mm throttle body

• Ignition: Full transistorized digital ignition

• Lubrication: Semi-dry sump

• Cooling: Liquid-cooled with twin radiators

⚙️ Performance

            Transmission: 5-speed (manual, sequential)

• Clutch: Wet, multi-plate

• Power: 62–68 hp (depending on tune and fuel)

• Torque: ~45 Nm

• Redline: 11,500–12,000 rpm

• Weight: ~27–30 kg for engine assembly

• Max Weight: 350lbs