HD 300

2020 Sym HD 300 Technical Analysis & Specification Breakdown

Built around Sym's scooter motorcycle platform, the 2020 Sym HD 300 relies on a 278.3 cc (17 cu in) liquid-cooled single cylinder, four-stroke powerplant. In factory specification, peak output is rated at 26.7 HP (19.5 kW) at 8,000 rpm while maximum torque reaches 25.7 Nm (19 lb-ft) at 6,000 rpm, transferring power to the rear wheel through a automatic gearbox and belt final drive. With a specific output of 95.9 HP per liter and a 2,000 rpm working window between peak torque (6,000 rpm) and peak power (8,000 rpm), the engine character is reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.

On the scales, the HD 300 measures 179 kg (395 lbs) wet (curb), translating to a power-to-weight ratio of 0.15 HP/kg (6.7 kg per horsepower). Rider ergonomics and chassis geometry center around a 800 mm (31.5 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,500 mm (59.1 in) wheelbase engineered for balanced agility and highway composure. The 10-liter (2.6 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 129 km/h (80 mph).

Within MotoLibrary's Sym archive, this model family spans 4 indexed model years from 2020 to 2025, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.