4 Stroke Motocross Bikes
Advantage: Zongshen NB300 engine
single cylinder
Four-stroke
water cooling
overhead cam
Inclined cylinder head
four valve
Sixth gear balance shaft
Welcome to the world of four-stroke motocross bikes, the latest innovation in motocross. Our four-stroke motocross bikes feature a single cylinder, four-stroke, liquid-cooled, overhead cam, sloped cylinder head, four-valve and six-speed balance shaft - delivering unrivaled levels of power and performance.
From the tip of the handlebars to the power of the engine, these four-stroke off-road machines are engineered to deliver exceptional performance. Sloped cylinder heads ensure smooth operation and improved compression for more efficient power transfer. Four valves reduce the need for back and forth movement, improving response and fuel efficiency. Finally, a six-speed balance shaft increases strength and durability while also reducing vibration.
Thanks to the incorporation of these advanced features, our four-stroke motocross bikes deliver an unrivaled combination of power and speed with minimal effort. So if you’re ready to take off-road to the next level, grab one of these four-stroke dirt bikes and get ready for your life.
| Engine（ZS174MM) | Zongshen NB300 single cylinder, four-stroke, water-cooled, overhead cam, inclined cylinder head, four-valve, six-gear balance shaft |
| Displacement(ml) | 279.5ml |
| Bore×Stroke | 74×65 |
| Max.Power | 18.5/8500kw/(r/min) |
| Max.Torque | 23/7000N.m/(r/min) |
| Compression Ratio | 10.7：1～11.3：1 |
| Lubrication Method | Pressure splash |
| Clutch Mode | Manual wet multi-plate type |
| Gearshift Mode | Constant mesh two-stage transmission six-speed transmission |
| Ignition mode | Capacitive energy storage type |
| Start Mode | Electric starting |
| Frame | High strength steel frame |
| Steering Column | CNC high-strength lightweight steering column |
| Muffler | Aluminum alloy back pressure package muffler |
| Front Shocks | Up and down two-way adjustable bold front shock absorber 54 φ- sixty φ |
| Rear Shocks | Up and down two-way adjustable air bag, bold rear shock absorption |
| Front Disk Brake | Double piston pump hydraulic front brake system |
| Rear Disk Brake | Single piston pump hydraulic rear brake system |
| Forks | High strength aluminum alloy flat fork |
| Rim | High strength aluminum alloy ring High strength aluminum alloy drum core |
| Tire | Yuanxing tire front 90/100-21 rear 120/90-18 |
| Length*Width*Height | 2170mm*810mm*1300mm |
| Ground Clearance | 290mm |
| Seat Height | 950mm |
| Fuel Tank Volume | 8L |
| Wheel Base | 1490mm |
| Curb Weight | 120kg |
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