X-PRO DB-KK21

X-PRO X17 125cc Automatic Dirt Bike User Manual

Model: DB-KK21

Introduction

This manual provides essential information for the safe and proper assembly, operation, and maintenance of your X-PRO X17 125cc Automatic Transmission Dirt Bike. Please read this manual thoroughly before operating the vehicle and retain it for future reference.

X-PRO X17 125cc Dirt Bike, front view

Figure 1: Front view of the X-PRO X17 125cc Dirt Bike.

Safety Information

Always wear appropriate safety gear, including a helmet, eye protection, gloves, and protective clothing, when operating the dirt bike. This vehicle is designed for off-road use only. Never operate over speeds unsafe for your skill or road conditions. Proposition 65 Warning: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

Assembly and Setup

Some assembly is required. This section outlines the steps for unpacking and assembling your X-PRO X17 dirt bike. It is recommended to have basic mechanical experience, tools, and assistance for assembly.

Assembly Video Guide

For a visual guide, please refer to the official assembly video below:

Video: X-PRO X17 125cc Dirt Bike Assembly Video. This video demonstrates the unpacking and assembly process for the dirt bike. Note: The bike shown in the video may be a different color than your product.

Step-by-Step Assembly Instructions

  1. Unpacking the Crate: Carefully cut the straps and remove the cardboard packaging from the metal crate. Use appropriate tools to remove any zip ties securing components.
  2. X-PRO X17 Dirt Bike in metal crate

    Figure 2: Dirt bike securely packaged within a metal crate.

  3. Remove Components: Locate and remove all accessory boxes and the front wheel from the crate.
  4. X-PRO X17 Dirt Bike in shipping box

    Figure 3: The dirt bike as it appears in its shipping box.

  5. Remove Bike from Crate: Unscrew the bolts securing the bike to the metal frame. With assistance, carefully lift the bike off the frame and place it on a stable surface or a bike stand.
  6. Install Handlebar Mounts: Open the accessory box and retrieve the handlebar mounts. Install the lower handlebar clamps onto the triple tree, ensuring they are oriented correctly. Secure them with the provided bolts.
  7. Attach Handlebars: Place the handlebars into the lower clamps. Position the upper handlebar clamps over the handlebars and secure them with the bolts. Ensure the handlebars are centered and tightened securely.
  8. Install Throttle Assembly: Slide the throttle assembly onto the right handlebar. Secure it in place with the provided screws.
  9. Install Front Fender: Attach the front fender to the front fork assembly using the provided bolts.
  10. Install Front Wheel:
    • Remove the protective plastic from the brake rotor.
    • Insert the wheel spacers into the wheel hub.
    • Align the front wheel with the fork legs.
    • Carefully slide the axle through the fork legs and wheel hub.
    • Secure the axle with the nut and tighten it using a wrench.
  11. Install Front Brake Caliper:
    • Remove the protective spacer from the brake caliper.
    • Position the brake caliper over the brake rotor.
    • Align the caliper with the mounting points on the fork leg and secure it with the bolts. Tighten securely.
  12. Connect Battery:
    • Remove the seat to access the battery compartment.
    • Connect the positive (+) red cable to the positive terminal of the battery.
    • Connect the negative (-) black cable to the negative terminal of the battery.
    • Ensure all connections are tight and secure.
  13. Install Handlebar Pad: Place the handlebar pad over the center of the handlebars.

Operating Instructions

Pre-Ride Check

  • Fuel Level: Ensure adequate fuel (unleaded gasoline) is in the tank.
  • Oil Level: Check engine oil level before each ride.
  • Tires: Inspect tire pressure and condition. Front Tire: 70/100-17", Rear Tire: 90/100-14".
  • Brakes: Verify front and rear brakes are functioning correctly.
  • Chain: Check chain tension and lubrication.
  • Fasteners: Ensure all nuts and bolts are tightened securely.

Starting the Engine (Electric Start)

  1. Turn the fuel valve to the "ON" position.
  2. If the engine is cold, pull the choke lever to the "ON" position.
  3. Turn the ignition key to the "ON" position.
  4. Press the electric start button.
  5. Once the engine starts, gradually push the choke lever to the "OFF" position as the engine warms up.

Automatic Transmission Operation

The X-PRO X17 features an automatic one-gear transmission, simplifying operation. To move forward, gently apply the throttle. To slow down or stop, release the throttle and apply the brakes. There is no clutch lever or gear shifting required.

Maintenance

Regular maintenance is crucial for the longevity and safe operation of your dirt bike. Perform the following checks and services at recommended intervals:

  • Oil Change: Change engine oil after the first 5 hours of operation, then every 10-15 hours or as specified in a detailed service manual (not included here).
  • Air Filter: Clean or replace the air filter regularly, especially when riding in dusty conditions.
  • Spark Plug: Inspect and clean the spark plug periodically. Replace if worn.
  • Chain Maintenance: Clean, lubricate, and adjust chain tension every few rides.
  • Brake System: Check brake fluid levels and inspect brake pads for wear. Bleed brakes if necessary.
  • Fasteners: Periodically check and tighten all nuts, bolts, and fasteners.
  • Tires: Monitor tire pressure and inspect for damage or excessive wear.

Troubleshooting

This section provides basic troubleshooting steps for common issues. For complex problems, consult a qualified technician.

  • Engine Does Not Start:
    • Check fuel level.
    • Ensure ignition key is "ON".
    • Verify battery connections are secure and battery is charged.
    • Check spark plug for fouling or damage.
    • Ensure choke is used correctly for cold starts.
  • Loss of Power:
    • Check air filter for clogging.
    • Inspect fuel lines and carburetor for blockages.
    • Verify spark plug condition.
  • Brakes Not Effective:
    • Check brake fluid level.
    • Inspect brake pads for wear.
    • Look for air in the brake lines (may require bleeding).

Specifications

FeatureSpecification
Engine125cc, 4-Stroke, Single Cylinder, Air Cooled
TransmissionAutomatic One Gear
Start SystemElectric Start
Max Torque8.8(1±10%)/5500(1±5%)
Max Power6.3(1±10%)/7500(1±5%) Kw/r/m
CarburetorPZ26 Jingke Carburetor
Ignition TypeC.D.I
Top Speed45+ Mph (Dependent on rider weight and road conditions)
FrameCradle Type Steel Tube Frame
Front ForkInverted 45*48-700mm Forks, Non-Adjustable
Rear Fork⌀10*275mm, Non-Adjustable
Front BrakeHydraulic Single Piston Caliper, 210mm Disc
Rear BrakeHydraulic Single Piston Caliper, 190mm Disc
Front Tire70/100-17"
Rear Tire90/100-14"
Net Weight151 lbs
Gross Weight181 lbs
Weight Capacity209 lbs
Overall Length64.2"
Overall Width29.52"
Overall Height41.34"
Wheelbase42.32"
Ground Clearance13.58"
Fuel Capacity3.5L / 0.92 Gal
Seat Height32.7"
Engine Kill SwitchYes
Foot BrakeYes

Warranty and Support

The X-PRO X17 125cc Dirt Bike comes with a 90 Day Warranty Against Manufacturer Defects. For warranty claims, technical support, or to purchase parts, please contact X-PRO customer service. You can also visit the official X-PRO Store for more information.

© 2026 X-PRO. All rights reserved. Information in this manual is subject to change without notice.

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