HENGJIAN engine assy S7-Z300-19-01 (Z300 293.2cc 2-stroke engine)
The HENGJIAN engine assy S7-Z300-19-01 is a factory-built complete Z300 powerplant designed for Hengjian's 293.2 cm³ two-stroke enduro combines a compact single-cylinder layout, liquid cooling and a race-oriented internal design to deliver responsive power and durability for demanding off-road use.
Key features
- OEM complete Z300 engine assembly for Hengjian 300 cc two-stroke enduro models.
- Single-cylinder, two-stroke, water-cooled petrol engine with square 72 mm × 72 mm bore and stroke for a balanced mix of torque and rev capability.
- Approx. 293.2 cm³ displacement with high compression ratio and performance-oriented porting to support aggressive off-road riding.
- Electric-start engine architecture with CDI ignition and carburettor fuel system for simple, serviceable operation.
- Wet multi-plate clutch and 6-speed constant-mesh gearbox engineered for enduro and cross-country conditions.
- Liquid-cooling circuit with integrated pump and radiator connections for stable operating temperatures on long technical stages.
- Supplied as a complete engine assembly to reduce rebuild time compared with assembling components individually.
Technical specifications
| Engine designation | Hengjian Z300 two-stroke engine assembly (S7-Z300-19-01) |
| Configuration | Single-cylinder, 2-stroke, water-cooled petrol engine |
| Displacement | 293.2 cm³ |
| Bore × stroke | 72 mm × 72 mm (square layout) |
| Compression ratio | Approx. 11.6 : 1 |
| Maximum power | Around 37 kW (manufacturer S8‑Z300 specification reference) |
| Maximum torque | Approx. 46 Nm (manufacturer S8‑Z300 specification reference) |
| Fuel system | Carburettor-based intake system |
| Ignition | CDI (capacitor discharge ignition) |
| Starting system | Electric starter; kick-start support depending on motorcycle configuration |
| Clutch | Wet multi-plate clutch |
| Transmission | 6-speed constant-mesh gearbox, chain final drive interface |
| Cooling | Liquid cooling with integrated water pump and external radiator circuit |
| Typical application | Hengjian Z300-based 300 cc 2-stroke enduro motorcycles (such as S8‑Z300 platforms) |
Typical use cases
The HENGJIAN engine assy S7-Z300-19-01 is intended as an OEM-grade replacement engine for Hengjian Z300 two-stroke enduro compact single-cylinder layout, strong mid-range and controlled top-end performance suit a broad range of off-road applications.
- Replacement for worn or damaged original Z300 engines on dedicated enduro motorcycles.
- Complete engine solution for workshop-level rebuilds where a new, assembled unit is preferred over individual internal components.
- Use as a spare race engine for hard enduro, cross-country and special-test focused machines where downtime must be minimised.
- Base engine for technical off-road riding, training and recreational enduro where tractable torque and predictable response are important.
Design and performance characteristics
The square 72 mm × 72 mm bore and stroke, combined with a relatively high compression ratio and tuned porting, support a broad, usable powerband that remains controllable in low-traction and technical cooling and the dedicated radiator circuit allow the engine to maintain consistent temperatures during long climbs and slow, technical sections.
The carburetted intake and CDI ignition system provide a straightforward, serviceable platform for workshops familiar with traditional two-stroke enduro wet multi-plate clutch and 6-speed constant-mesh gearbox give the drivetrain characteristics expected from a modern competition-focused 300 cc enduro motorcycle engine.
