TrailMaster LK140 Pro Series Dirt Bike, Electric Start, 4-Speed Manual, Dual Disc Brakes, (17/14) Wheels

     The TrailMaster LK140 Pro Series is a mid-size performance dirt bike built for riders who want a strong balance of power, control, and upgraded suspension components. Powered by a reliable 140cc 4-stroke engine, it delivers smooth acceleration, solid torque, and dependable trail performance for off-road riding.

     Equipped with a 4-speed manual transmission, electric start with kick-start backup, inverted front suspension, nitrogen rear shock, and hydraulic dual disc brakes, the LK140 is designed for riders who want more control and a more advanced riding experience. Its larger 17-inch front and 14-inch rear wheels provide improved stability, better obstacle clearance, and smoother handling on rough terrain. Ideal for riders ages 12 and up, it’s a strong step-up option for teens and adults moving into higher-performance dirt bikes.

Performance Specs:

Engine

• 140cc Single-Cylinder, 4-Stroke, Air-Cooled / Oil-Cooled Engine (Zhongshen/Yinxiang platform depending on batch)
• 140cc Displacement
• 4-Speed Manual Transmission
• Manual Clutch System
• Electric Start with Kick Start Backup
• CDI Ignition System
• Chain Drive System
• Maximum Power: ~6.8 HP @ 7500 RPM
• Maximum Torque: ~9.7 N·m @ 5500 RPM
• Compression Ratio: ~8.8:1
• Fuel Consumption: ≤367 g/kW·h

Fuel System

• Fuel Capacity: 1.56 Gallons (6L)
• Carbureted Fuel System
• Recommended Engine Oil: 15W-40

Suspension

• Front: Inverted hydraulic forks (non-adjustable)
• Rear: Nitrogen gas rear shock with aluminum linkage
• Pro-Series race-style suspension setup
• Built for improved stability and impact absorption

Braking System

• Front Hydraulic Disc Brake
• Rear Hydraulic Disc Brake
• Dual disc braking system for strong, consistent stopping power

Wheels & Tires

• Front Tire: 70/100-17 knobby off-road tire
• Rear Tire: 90/100-14 knobby off-road tire
• 17-inch front wheel / 14-inch rear wheel
• Alloy rims and hubs
• Off-road tread for traction and control

Dimensions

• Overall Length: 69.4 in
• Overall Width: 28.9 in
• Overall Height: 42.9 in
• Wheelbase: 47.7 in
• Seat Height: 32.9 in
• Ground Clearance: 13.3 in

Frame & Construction

• Heavy-duty steel frame
• Alloy triple clamps
• Foldable alloy levers
• Stainless steel performance exhaust
• Reinforced Pro-Series motocross-style chassis

Weight

• Net Weight: 172lbs
• Gross Weight: 226lbs

Additional Features

• Electric start system
• Kick start backup
• 4-speed manual clutch transmission
• Inverted front suspension for improved handling
• Nitrogen rear shock for smoother ride quality
• Full motocross ergonomics
• Built for trail, off-road, and recreational riding
• Available in Red, Blue, Green, and Orange
• Recommended Rider Age: 12+ Years

What's Included

✔ TrailMaster LK140 Dirt Bike
✔ Electric Start Battery
✔ Kick Start System
✔ Tool Kit
✔ Owner’s Manual
✔ Assembly Hardware & Instructions