TrailMaster LK140 140cc 4-Stroke Dirt Bike
True Dirt-Bike Performance with Premium Alloy Components
The all-new TrailMaster LK140 brings true dirt-bike design and upgraded components to the TrailMaster lineup. Built around a reliable Yinxiang 140cc four-stroke engine, the LK140 combines electric and kick starting, four-speed gearing, inverted front forks, a nitrogen-filled rear mono shock, and oversized vented disc brakes for confident off-road performance.
Premium alloy components—including alloy rims, alloy hubs, foldable hand levers, and triple-tree clamps—give the LK140 a rugged, competition-inspired appearance while keeping the chassis equipped for demanding recreational trail riding.
Key Features
Yinxiang 140cc Four-Stroke Engine
The LK140 is powered by a single-cylinder Yinxiang engine designed for reliable off-road operation.
- 140cc displacement
- Single-cylinder, four-stroke design
- Air-cooled / oil-cooled system
- Maximum power: 6.8 kW @ 7,500 rpm
- Maximum torque: 9.7 N·m @ 5,500 rpm
- Compression ratio: 8.8:1
- CDI ignition
- Stainless steel muffler
Four-Speed Manual Transmission
A four-speed transmission and chain final drive provide direct control over the bike's power delivery.
- Four-speed gearing
- Non-circulating gear arrangement
- Chain drive
- Electric and kick start
Upgraded Alloy Components
The LK140 features numerous polished and lightweight alloy components throughout the chassis.
- Alloy front and rear rims
- Alloy hubs
- Polished alloy foldable hand levers
- Alloy upper and lower connecting boards
- Alloy handlebar components
- Upgraded hardware
Inverted Front Forks
The inverted front fork provides a sturdy front-end platform for off-road riding.
- Inverted front fork
- Non-adjustable design
- 17-inch front wheel
- 70/100-17 front tire
Nitrogen-Filled Rear Mono Shock
A nitrogen-filled rear mono shock works with the extended rear trailing-arm suspension design to help manage bumps and uneven terrain.
- Rear mono-shock suspension
- Nitrogen-filled shock
- Alloy U&D connector
- Extended rear trailing-arm design
- Non-adjustable rear shock
Oversized Vented Disc Brakes
The LK140 is equipped with oversized vented disc brakes at both ends to help manage heat during repeated braking.
- Front disc brake
- Rear disc brake
- Vented brake design
- Designed for improved stopping performance
Durable Steel Frame
A high-quality steel frame provides the foundation for the bike's off-road chassis.
- High-quality steel frame
- Rugged dirt-bike geometry
- Alloy chassis components
- Upgraded hardware
Stainless Steel Exhaust
The stainless muffler provides a durable exhaust component while complementing the sound and appearance of the Yinxiang engine.
Specifications
Engine & Performance
| Specification |
Details |
| Engine |
Yinxiang 140cc |
| Engine Type |
Single-cylinder, 4-stroke |
| Cooling |
Air-cooled / Oil-cooled |
| Displacement |
140 ml |
| Maximum Power |
6.8 kW @ 7,500 rpm |
| Maximum Torque |
9.7 N·m @ 5,500 rpm |
| Compression Ratio |
8.8:1 |
| Ignition |
CDI |
| Starting System |
Electric / Kick Start |
| Minimum Fuel Consumption |
≤367 g/kW·h |
| Lubricant |
SF15W/40 |
| Exhaust |
Stainless steel muffler |
Transmission
| Specification |
Details |
| Shift Type |
Four-speed, non-circulating gear |
| Final Drive |
Chain Drive |
Frame, Suspension & Brakes
| Specification |
Details |
| Frame |
High-quality steel |
| Front Fork |
Inverted, non-adjustable |
| Rear Shock |
Nitrogen-filled mono shock, non-adjustable |
| Rear Suspension Connector |
Alloy U&D connector |
| Upper/Lower Connecting Boards |
Alloy |
| Front Brake |
Disc |
| Rear Brake |
Disc |
| Handlebar |
Alloy |
| Hand Levers |
Polished alloy, foldable |
Wheels & Tires
| Specification |
Details |
| Rims |
Alloy |
| Hubs |
Alloy |
| Front Rim |
17-inch |
| Rear Rim |
14-inch |
| Front Tire |
YUANXING 70/100-17 |
| Rear Tire |
YUANXING 90/100-14 |
Dimensions & Capacity
| Specification |
Details |
| Overall Dimensions |
1780 × 740 × 1100 mm |
| Overall Dimensions |
69.42 × 28.86 × 42.9 in |
| Wheelbase |
1210 mm / 47.67 in |
| Seat Height |
835 mm / 32.89 in |
| Ground Clearance |
340 mm / 13.26 in |
| Fuel Capacity |
6 L / 1.56 gal |
| Net Weight |
78 kg / 171.6 lbs |
| Gross Weight |
103 kg / 226.6 lbs |
Packing & Shipping
| Specification |
Details |
| Packing Size |
1370 × 440 × 660 mm |
| Packing Size |
53.43 × 17.16 × 25.74 in |
| Net Weight |
171.6 lbs |
| Gross Weight |
226.6 lbs |
Ideal Applications
- Recreational dirt-bike riding
- Off-road trails
- Private-property riding
- Dirt and mixed-terrain recreation
- Weekend trail adventures
- Riders looking for a true manual-shift dirt-bike experience
Rider Safety & Guidance
The TrailMaster LK140 is an off-road dirt bike intended for suitable riding environments. Riders should wear a properly fitted helmet, eye protection, gloves, boots, and appropriate protective riding gear.
Inspect the brakes, tires, wheels, chain, controls, suspension, and fasteners before each ride. Operate the bike only in areas where off-road riding is permitted and follow applicable local requirements.
Basic Care & Maintenance
- Check engine oil and maintain the recommended lubricant level.
- Inspect and lubricate the chain regularly.
- Check brake discs and braking components for wear.
- Inspect tire condition and inflation before riding.
- Check suspension components and mounting hardware periodically.
- Inspect alloy wheels, hubs, and fasteners for damage or looseness.
- Keep the air intake and engine area clean.
- Follow the manufacturer's recommended service intervals.
Why Choose the TrailMaster LK140?
The TrailMaster LK140 combines a
140cc Yinxiang four-stroke engine, four-speed manual transmission, inverted front forks, nitrogen-filled rear mono shock, alloy wheels and hubs, and front/rear disc brakes in a purpose-built dirt-bike package.
With premium alloy components, a high-quality steel frame, 13.26 inches of listed ground clearance, and a stainless steel muffler, the LK140 is designed to deliver a rugged and authentic off-road riding experience.
