HKR9-PR300 motorcross
Appearance Design
The exclusive HKR exterior design integrates a hardcore endurance style, featuring a factory-textured seat cushion specifically customized for extreme off-road riding. The aggressive body lines and bold color scheme highlight the wild and powerful essence of an off-road motorcycle while ensuring practicality. The high-visibility design allows the bike to remain easily identifiable even in challenging terrains.
Product Introduction
  • Appearance Design
    The newly designed seat cushion incorporates high-friction materials on the surface, ensuring a secure riding position and preventing slippage during intense riding. The knee contact area has been optimized to enhance riding comfort and improve bike control. Additionally, the bike’s stability during lateral tilts has been reinforced, giving riders greater confidence when cornering at high speeds or navigating rugged terrains.
  • Body Design

    The newly designed seat cushion incorporates high-friction materials on the surface, ensuring a secure riding position and preventing slippage during intense riding. The knee contact area has been optimized to enhance riding comfort and improve bike control. Additionally, the bike’s stability during lateral tilts has been reinforced, giving riders greater confidence when cornering at high speeds or navigating rugged terrains.


  • Frame

    The main frame is constructed from seamless chrome-molybdenum steel tubing, combining high strength with lightweight properties. The fully robotic welding process ensures uniformity, durability, and an aesthetically refined finish. The subframe is made of ultra-light aluminum alloy, further reducing overall weight, improving maneuverability and dynamic response, while maintaining sufficient rigidity to withstand impacts and vibrations encountered in high-intensity off-road riding.

  • Suspension System

    The front suspension features a fully adjustable 300mm long-travel fork with a 48mm single-chamber design, allowing precise tuning based on rider weight and terrain conditions. It ensures maximum compression travel when navigating rocks, roots, and other obstacles, absorbing impacts and maintaining front-wheel traction.The rear shock absorber has a stroke of 120mm, fully adjustable with airbags, and supports adjustable rebound damping to adapt to different terrains and riding styles, ensuring that the rear wheels remain stable when jumping, landing, or passing through bumpy roads, providing excellent grip and comfort.

  • Braking System

    The front brake system features a dual-piston hydraulic caliper paired with a 260mm brake disc, delivering powerful stopping force to ensure rapid deceleration during high-speed riding or steep descents. The rear brake system uses a single-piston hydraulic caliper with a 220mm brake disc, providing precise rear-wheel braking control. Specially designed wave-style brake discs enhance heat dissipation, ensuring stable braking performance under extreme conditions.

  • Exhaust System

    The silencer adopts a Scorpion-style design, optimizing the exhaust note and incorporating a centrally positioned back-pressure chamber. This enhances low-end torque output, meeting the demands of off-road riding where frequent low-speed, high-torque performance is essential.

  • Chest Pad

    Equipped with a high-density foam chest pad, providing additional protection by reducing chest impact in case of an accident during high-speed riding or jumps.

  • Engine

    (Zongshen PR300 Air-Cooled Engine / Loncin YB300 Air-Cooled Engine)

    Equipped with a high-efficiency air-cooling system and lightweight design, this engine delivers strong power output and reliable durability. Specifically designed for off-road and multi-purpose motorcycles, it is known for its simplicity, reliability, ease of maintenance, and adaptability—making it an ideal choice for off-road and adventure motorcycles. Whether for long-distance touring or tackling complex terrains, it provides riders with a stable and efficient riding experience.


  • Fuel Tank

    With a capacity of approximately 8.7L, the fuel tank is crafted using rotational molding technology from polyethylene (XPE) material. This lightweight design offers excellent impact resistance and corrosion resistance, ensuring reliability and durability even in harsh environments—perfectly suited for long-distance off-road adventures.

  • Foldable Levers

    Both the clutch and brake levers adopt a lightweight, foldable Magura-style design, offering a smooth operating feel. The foldable mechanism prevents damage in the event of a fall, enhancing durability and safety.

parameter configuration
  • engine

    Engine Brand

    ZS PR300

    Engine Mode

    ZS175FMN

    Engine Type

    Singlecylinder,4-stroke,air-cooling, camshaft upward

    Displacement(ml)

    271.3 mL

    Net weight (kg)

    33.7 kg

    Max.Power(kW/r/min)

    15/8500

    Max.Torque (N.m/r/min)

    21/6500

    Compression Ratio

    9.29:1

    Bore*Stroke(mm)

    75*61.4

    Ignition method

    Capacitive energy storage type

    Lubrication method

    Pressure and Splash

    Starting method

    Electric

    Clutch type

    Manual Wet Multi-Plate

    Gearbox

    5 gears

    Fuel supply method

    Carburetor

    Output transmission mode

    chain drive

  • Vehicle chassis

    Frame type

    Chromolly steel Cradle frame

    Swingarm

    Alluminume swingarm

    Linkage

    Aluminum alloy double rocker arm

    Transmission mode

    chain drive

    Transmission system

    Chain: 520#
    Rear sprocket: 520# 52T alluminume

    Clutch control mode

    Cable clutch

    Tire Brand

    Yuanxing

    Tire size

    Standard: Front: 90/100-21 Rear: 110/100-18
    Option: Rear: 120/100-18

    Wheel Assy

    6 series alluminume Spoke wheel Forged alluminume hub

    Front Suspension System

    Compression rebound damping adjustable inverted front fork

    Rear Shock System

    External airbag adjustable rear shock, SAG 75kg

    Triple Climp

    CNC alluminume triple clamp, alluminume steering

    Handel bar

    alluminume fat handle bar

    Brake configuration

    Front: Single piston 260mm fixed disc 4mm+double-piston floating caliper, foldable alluminume brake lever
    Rear: Single 220mm fixed disc 4mm+single piston floating caliper, forged alluminume foot brake lever

    Side Stand

    aluminum alloy

    Throttle configuration

    Cast alloy throttle seat, Single cable+manual air valve

  • Complete vehicle

    Dimension(mm)

    2150*830*1285mm

    Seat height

    955mm

    Wheelbase

    1475mm

    Steering angle

    ±43.5°

    Ground Clearance

    310mm

    Net Weight(kg)

    116.5Kg

    Fuel tank capacity

    8.7L

  • Configuration status

    Instrument

    /

    Switch

    One click start/stop switch

    Headlight

    /

    Taillight

    /

    Fuel tank cap

    Color options:Black, Blue, Red

HKR Racing Co., Ltd Copyright 2025. All rights reserved

E-mail:andyceu@hotmail.com

Address:No. 8, Baohong Avenue, Yubei District, Chongqing