TrailMaster MK125ES Pro Series Dirt Bike - Bosch EFI, 4-Speed, Electric Start, Dual Disc Brakes

Description

The TrailMaster MK125ES Pro Series is a premium 125cc mid-size dirt bike built for riders ages 12 and up who are ready to take their off-road game to the next level. Powered by a 4-stroke, air-cooled, fuel-injected engine with a genuine Bosch EFI system, this bike delivers smooth, consistent power across every gear without the hassle of a carb. A 4-speed manual transmission (N-1-2-3-4 - no circular shifting) gives you real control, while electric start with kick backup means you're never stranded on the trail.

Designed with motocross ergonomics and a race-ready suspension setup, the MK125ES handles everything from hardpack to rough terrain with confidence. Inverted 43/45mm front shocks, a nitrogen air gas rear mono shock, and dual disc brakes front and rear give you the stopping power and ride quality of bikes costing far more. At just 149 lbs and a 29.5" seat height, this is a serious machine that smaller and intermediate riders can actually manage.

Key Features

• Bosch EFI Fuel Injection: Genuine Bosch electronic fuel injection for reliable, consistent starts and smooth power delivery in all conditions.
• 125cc Air-Cooled 4-Stroke Engine: Single-cylinder, 4-stroke motor with 123.67cc displacement - proven, low-maintenance, and trail-ready.
• Electric Start with Kick Backup: Push-button electric start keeps things simple; kick start backup ensures you're never stuck in the field.
• 4-Speed Manual Transmission (N-1-2-3-4): True sequential shifting - not circular - so you always know what gear you're in.
• Inverted Front Forks (43/45mm): Race-spec inverted front shock absorbers deliver superior steering precision and bump absorption over rough terrain.
• Nitrogen Air Gas Rear Shock: Rear mono shock absorber provides a planted, controlled ride on variable terrain.
• Dual Disc Brakes: Front and rear disc brakes give confident, responsive stopping power in all riding conditions.
• Low 29.5" Seat Height: Approachable seat height designed for younger and smaller-stature intermediate riders.
• Performance Stainless Steel Muffler: Durable exhaust with a performance-tuned tone and long-lasting corrosion resistance.
• Alloy Wheels, Hubs & Foldable Levers: Lightweight alloy construction throughout with foldable handle levers that survive tip-overs on the trail.
• Waterproof Wire Harness: Fully sealed electrical system built to handle mud, rain, and stream crossings without issue.
• 14/12 Wheel Configuration: 14" front / 12" rear YUANXING tires sized and balanced for youth-to-intermediate off-road riding.

Shipping

This product requires additional shipping. If you'd like a quote before you purchase, fill out the form on this page or email us at service@omahasportsandgames.com for a delivery ETA or to confirm shipping details.

What's Included

• TrailMaster MK125ES Pro Series Dirt Bike (color of choice)

Why You'll Love It

The MK125ES Pro Series is where serious off-road riding begins. TrailMaster has built a reputation for delivering bikes that punch well above their price point, and this model is a standout example - with genuine Bosch EFI, race-spec inverted forks, and a dual disc brake setup you won't find on most bikes in this class. The newly designed frame is purpose-built for motocross ergonomics, meaning hours in the saddle stay comfortable and in control. Parents and riders alike will appreciate the confidence that comes from a bike with no circular shifting, a proper sequential gearbox, and a waterproof electrical harness that holds up to real-world abuse. Whether you're hitting trails on the weekend or working toward your first race, the MK125ES is a machine you can grow with and trust.

Product Specifications

FAQ