Hengjian S8-YB300H STANDARD
The Hengjian S8-YB300H STANDARD is a full-size off-road enduro/motocross motorcycle designed for riders seeking a durable, easy-to-ride machine with a strong balance of performance, control and long-term air-cooled 4-stroke single-cylinder engine, agile chassis and high ground clearance make it suitable for demanding tracks and rough off-road terrain.
Key Features
- 285.8 cc air-cooled, 4-stroke, single-cylinder engine for simple, reliable performance.
- Max power of 18 kW and 23 Nm of torque for strong pull across the rev range.
- Full-size 21" front and 18" rear off-road wheel combination for optimal traction and stability.
- Long-travel off-road suspension and high ground clearance for technical enduro and motocross tracks.
- Lightweight chassis with 129 kg curb weight and 120 kg rated load capacity.
- High 960 mm seat height for an aggressive, race-oriented riding position.
- Modern disc brakes and lithium battery for dependable stopping power and reduced overall weight.
- 8 L fuel tank capacity suitable for training sessions, track days and trail rides.
Engine & Performance
The S8-YB300H STANDARD is powered by a 285.8 cc, air-cooled, 4-stroke single-cylinder engine with a bore and stroke of 76 x 63 mm and a compression ratio of 9.02: configuration delivers a maximum output of 18 kW and 23 Nm, providing tractable power that is easy to control on loose surfaces while still offering enough performance for spirited off-road riding and amateur competition.
The engine’s simple construction is aimed at low-maintenance operation and broad, usable torque curve supports low-speed technical sections, hill climbs and tighter turns, while maintaining sufficient top-end power for faster motocross-style circuits.
Chassis, Suspension & Brakes
The S8-YB300H STANDARD uses a lightweight, off-road-focused chassis with geometry tuned for stability at speed and responsive handling in tight a wheelbase of 1460 mm, the motorcycle balances straight-line confidence with agile cornering characteristics.
- Dimensions: 2320 x 820 x 1340 mm (length x width x height)
- Wheelbase: 1460 mm
- Curb weight: 129 kg
- Rated load: 120 kg
- Front tire: 90/100-21
- Rear tire: 120/90-18
- Brakes: Hydraulic disc brakes front and rear
The combination of a 21-inch front wheel and 18-inch rear wheel is standard for serious off-road motorcycles, contributing to precise steering, confident grip and impact absorption over ruts, rocks and brakes on both wheels provide reliable stopping power and brake feel, even in muddy or wet conditions.
Ergonomics & Rider-Focused Details
The S8-YB300H STANDARD features a tall 960 mm seat height and a slim off-road seat profile designed to support active riding positions, frequent weight shifts and standing on the pegs. A ground clearance of 335 mm helps the bike clear obstacles, logs and deep ruts without interference.
- Seat height: 960 mm
- Ground clearance: 335 mm
- Fuel tank capacity: 8 L
- Battery: 12 V 4 Ah lithium
- Clutch: Wet multi-plate design for consistent engagement
The compact 8 L fuel tank, lightweight lithium battery and wet multi-plate clutch contribute to responsive handling and consistent power ergonomic layout is aimed at off-road riders who require secure control in standing and seated positions over long training days or race heats.
Typical Use Cases
- Motocross and enduro training on natural terrain and man-made tracks.
- Club-level competition and amateur racing in open or hobby classes.
- Trail riding and recreational off-road tours on mixed surfaces.
- Riders stepping up from smaller trail bikes to a full-size enduro platform.
- Technical riding practice on hills, forest sections and rocky singletrack.
Technical Specifications
| Parameter | Value |
| Model | Hengjian S8-YB300H STANDARD |
| Engine type | Single-cylinder, 4-stroke |
| Cooling | Air cooled |
| Displacement | 285.8 cc |
| Bore x stroke | 76 x 63 mm |
| Compression ratio | 9.02:1 |
| Maximum power | 18 kW |
| Maximum torque | 23 Nm |
| Overall dimensions (L x W x H) | 2320 x 820 x 1340 mm |
| Wheelbase | 1460 mm |
| Curb weight | 129 kg |
| Rated load | 120 kg |
| Seat height | 960 mm |
| Ground clearance | 335 mm |
| Front tire | 90/100-21 |
| Rear tire | 120/90-18 |
| Fuel tank capacity | 8 L |
| Brake type | Disc, front and rear |
| Battery | 12 V 4 Ah lithium |
| Clutch | Wet multi-plate |
