2025 TM MK125E EFI Pit Bike

2025 TrailMaster MK125E – 125cc EFI Pit Bike (4-Speed • Elec + Kick)

Mini-moto with big-bike attitude. The 2025 TrailMaster MK125E JHL Pro Series is a compact 125cc EFI dirt bike built for riders who want more than a play bike—Bosch EFI 4-stroke engine, 4-speed manual-style gearbox, inverted forks, disc brakes, and alloy hubs in a 29.5" seat-height chassis. It’s a killer step up from 110s and a perfect pit / trail bike for youth and smaller adults.

Price: (Ask) — NO FEES (price + tax only)
Pickup today • Delivery available nearby

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Why riders love it

125cc EFI power in a small package:
The MK125E runs a BS125 single-cylinder 4-stroke with Bosch EFI, so it starts easier, runs cleaner, and has smoother throttle response than carb minis. Great torque for yard tracks, trails, and pits without being sketchy.

4-speed gearbox for real shifting:
A 4-gear, non-circulating transmission (N-1-2-3-4) lets riders actually shift like a “real” bike instead of just twist-and-go. Ideal for kids and teens learning proper gear selection or adults wanting a fun pit bike.

Electric AND kick start:
Hit the electric start button most of the time, with a kick starter backup so you’re never stuck if the battery’s low.

Pro-style chassis bits:
Built on a strong steel frame with inverted front shocks, rear mono shock, front & rear disc brakes, stainless exhaust, foldable alloy levers, and high-quality alloy hubs. It looks and feels way more “real bike” than entry-level minis.

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Key Specs – 2025 MK125E EFI

Engine & Drivetrain

• Engine Type: BS125 single-cylinder, 4-stroke, air-cooled

• Displacement: 123.67 ml (125cc class)

• Max Power: ~6.3 kW @ 7500 rpm

• Max Torque: ~8.8 Nm @ 5500 rpm

• Compression Ratio: 9.0:1

• Fuel System: Bosch EFI

• Ignition: EFI

• Shift Type: Four-gear, non-circulate (N-1-2-3-4)

• Start Type: Electric & kick start

• Transmission: Chain drive

Chassis, Suspension & Brakes

• Frame: High-quality steel frame

• Front Fork: Inverted front shock absorbers (approx. 43/45 mm)

• Rear Shock: Non-adjustable rear mono shock (nitrogen gas with aluminum linkage on many trims)

• Upper/Lower Triple Clamps: Alloy

• Handle Levers: Alloy, foldable

• Exhaust: Performance stainless steel muffler

• Brakes: Front disc • Rear disc

• Wheels: Steel rims with high-quality alloy hubs

• Tires: YUANXING

  • Front: 60/100-14

  • Rear: 80/100-12

Size & Fit

• Overall Size (L x W x H): ~63.8" x 27.6" x 42.9"

• Wheelbase: ~45.3"

• Seat Height: 29.5"

• Ground Clearance: 10.2" (260 mm)

• Fuel Capacity: 0.92 gal (3.5 L)

• Max Weight (rated): ~149.6 lb

Rider Size / Range:
Great for older kids, teens, and smaller adults looking for a compact 125 pit/trail bike. We’ll do an in-store sit test so you can see if the 29.5" seat height feels right.

Note: Specs and trim can vary slightly by production run; we’ll confirm colors and details at pickup.

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What’s included

• Pre-delivery inspection & test run

• Quick rider orientation (EFI behavior, starting, shifting, braking, basic maintenance)

• Helmets/boots/gloves in stock if you want to build a safety bundle

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📍 Throttle Theory Powersports
12373 Scarsdale Blvd, Suite C, Houston, TX 77089
📲 832-752-9062