Cobra CX 50 SR (The King)


Broad Torque Curve

•Excellent low-end torque and over-rev!
• No compromise power delivery

5Gx 3-Shoe Clutch (5thGeneration)

• No plates to warp, Precision, consistent operation
• Hits as hard at the end of a moto as it does on Lap 1. Freewheels for faster cornering and easier starting.

USD 32mm Front

• Mechanical spring for consistent operation. ‘Right Sized’ for a small chassis. Fully adjustable cartridge design.
• Inspires confidence over rough terrain

Piggyback Canister Rear Shock

• Compression (high & low speed) Adjustment
• Tunable for the rider. No-Fade performance throughout the race

REAL air filter

• Air filter is mounted in airbox, not on top of air box. More surface area, More protection from dirt
• Dirt or water that enters airbox cannot make its way into the engine. More power (especially in long motos and dusty off-road events)

Largest Air box in Class

• Improved breathing. Large pre-carburetor volume greatly improves throttle response
• Power when you need it!

One-Piece Aluminum Wheels

• Stronger, Lighter Wheels
• Reduced maintenance, improved acceleration and traction over rough terrain.

Billet, Wide Footprint Triple Clamp

• Spreads the clamp load out over a larger area of the fork upper tube
• Improved fork action

Billet Chain Adjuster Blocks

• Strongest in class
• Never DNF from a slipping rear axle again!

Twin-Spar Frame

• Best overall combination of torsional flexibility and lateral stiffness
• Excellent straight-line stability and cornering feel – inspires confidence – reduces lap times

Cobra Friction Drive

• Allows some slip between the crank and rear wheel
• Longer driveline life (crank, transmission, clutch, chain) and improved drive through rough choppy terrain

Progressive Rate Rear Suspension

• Linear rising rate without a link! Reduced weight, and friction
• Supple over small bumps for good traction…Absorbs big hits for aggressive riding.

  • Dry Weight // 91 lbs / 41 Kg
    Engine // Cobra Venom 50cc 2-stroke
    Bore x Stroke // 39mm x 41.7mm
    Induction // Case Reed V-Force® Reed Valve 19mm Carb
    Cooling // Water cooled Top-end and Case
    Clutch // Cobra 5Gx Freewheeling 3-Shoe
    Transmission // Single-speed auto
    Exhaust // Tuned pipe and silencer
    Lubrication // Mixture lubrication – Bel-Ray H1-R
    Fuel Capacity // 1.1 Gallons / 4.2L
    Frame // Twin Spar Oval HSLA
    Wheelbase // 990mm
    Seat Height // 680mm
    Ground Clearance // 245mm
    Front Brakes // CARD Hydraulic Disk (160mm)
    Rear Brakes // CARD Hydraulic Disk (140mm)
    Front Suspension // CARD Smart-Leg 32mm USD Fully Adjustable 210mm travel
    Rear Suspension // CARD Fully Adjustable (High & Low Speed) 248mm travel
    Wheel Front / Rear // Cobra 12″ Billet Hard Anodized/ Cobra 10″ Billet Hard Anodized
    Tires Front / Rear // Dunlop 60/100-12 MX3SF / Dunlop 70/100-10 MX3S

NEW!  Forged Aircraft Grade Aluminum Triple Clamps – All of our 50cc models receive new clamps for 2019. These clamps are lighter, impart less force onto the fork tubes for improved suspension action, and they provide a clamping feature onto the steering stem for improved steering feel.

NEW!  Frame Head Tube and Steering Stem – A thinner wall head tube and a 7075-T6 Aluminum steering stem work together to reduce weight and centralize mass.

NEW!  Dunlop Geomax MX33 Intermediate-Terrain Tires – Dunlop is at it again. For 2019 they have introduced the completely re-engineered Geomax MX33. Enhanced grip, improved slide control, and a larger contact patch with the ground all add up to reduced lap times. No corners cut here!

IMPROVED!  Front Brakes – Further refinements on the CARD front brake system include a more powerful 9.5mm master cylinder piston, improved master cylinder bore finish for better brake feel, and a thinner, more ergonomic brake lever to better fit small hands.

IMPROVED!  Lightweight Fasteners – Several fasteners have been re-engineered from aircraft grade 7075-T6 Aluminium for even more weight savings.

Venom Series Engine  – The 2019 King 50 is powered by Cobra’s Venom Series 50cc powerplant. This thing rips! Cobra engineers designed a  ‘no-compromise’ torque curve featuring massive amounts of low-end torque for launching off the gate and out of corners, this in addition to Cobra’s classic over-rev that provides that ‘2nd gear’ for wide open situations. This little beast offers more power, more torque, less weight and a smaller, lighter package.

Micro Handle Bars – Cobra is proud to offer Pro-Taper’s innovative Micro Handlebars across our 50cc lineup. These bars will revolutionize the way that young riders control their motorcycles by offering a reduced diameter grip area that inspires confidence and reduced fatigue.

Bel-Ray Factory Fill – Cobra and Bel-Ray, two proud American companies with a long history in motocross, have teamed up to ensure that each Cobra model comes from the factory with the finest in lubricants and chemicals. This includes everything from wheel bearing grease, to brake fluid, to suspension fluid, to the oil on the air filter.

5Gx Freewheeling Clutch – Precision engagement, durable, freewheels for increased corner speed and easier starting.

Revolutionary MXT “Smart Leg” Front Fork – Cobra’s exclusive 32mm USD CARD cartridge fork is the finest fork in minicycle racing! The Smart architecture simultaneously provides supple action over small bumps, and progressive control through the biggest of hits…A feature especially important for minicycles that run on tracks torn up by bikes twice their size! This fork also features fully adjustable rebound and compression damping and bottoming control adjustment not found on any other fork of any size!

Class-leading Twin Spar High-Strength Low-Alloy Oval Tube Frame – Super-strong, outstanding lateral strength with just the right amount of torsional rigidity.

Off-plane Tuned Expansion Chamber – Packages tight, features D-shaped header for minimal flow losses.

CX50 SR History

Cobra revolutionized the motocross world in the early 1990s with the introduction of the first true race-ready 50cc motocross bike. Over the past two decades, the King 50 has kicked off the careers of many of the world’s top racers including Davi Millsaps, Brock Tickle, Darryn Durham, Blake Baggett, Nico Izzy, and Eli Tomac not to mention up-and-comers such as Adam Cianciarulo, Cooper Web, and Thomas Covington. For 2013, the King 50 receives dozens of refinements that will ensure it retains its spot as the bike that launches successful careers. To start things off, the 2013 model gets a refined version of its ground-breaking ‘Smart Leg’ front fork which allows the bike to simultaneously track through small bumps while being able to absorb the biggest of hits without a whimper. In the engine department, a revised pipe improves bottom-end grunt, and of course our patented Cobra Friction Drive (CFD) protects critical driveline components while at the same time improves rear wheel tracking ability. Furthermore, the rear shock gets improved bottoming capabilities, and as always the King comes equipped with super-light and super-strong mag wheels. All this (and more!) will make the 2013 Cobra King 50 the dominate senior-class mini for next year!

2013 Cobra CX50 BW

  • Revolutionary MXT “Smart Leg” front fork – Cobra’s exclusive 30mm USD CARD fork is designed exclusively for the 50cc application…it’s not just a shortened version of a fork meant for a larger bike! The Smart architecture is designed to simultaneously provide very supple action over small bumps, and progressive control through the biggest of hits…A feature especially important for minicycles that run on tracks torn up by bikes twice their size!
  • Patented Cobra Friction Drive – no one else has anything close. Cobra’s CFD design is easy to maintain, and it offers reduced gear drag and lower rotating inertia. A well-protected driveline and improved traction and suspension action are benefits exclusive to Cobra.
  • New 4Gx clutch assembly offers a stronger shoe design and improved reliability.
  • CARD piggyback rear shock with adjustable rebound, adjustable high speed compression, and adjustable low speed compression – more features than most of the big bike shocks!
  • New works-style hand made oversized radiator featuring improved strength and cooling.
  • Class-leading twin spar high strength low alloy oval tube frame – super-strong, outstanding lateral strength with just the right amount of torsional rigidity.
  • Largest air box in its class with a real air filter featuring the largest filter surface area that is vertically mounted for optimal engine protection and maximum power.
  • Improved pipe/silencer for more power and torque. Reduced sound output is also part of the package.
  • Cobra’s “Mag” wheels are lighter weight and stronger than spoked wheels, and as always, maintenance-free!
  • Equipped with top-of-the-line billet triple clamps that offer adjustable bar mounts so the bike can grow with your rider.

Suspension Tuning Package

Suspension is valved exclusively for the rider’s size and skill level.

Springs Upgrade
Lighter Springs (Less than 51lbs)
Heavier Springs (Greater than 60lbs)

Seat Upgrade
(Colors: Black, Blue, or Red)
Stomp seat

Anodized Parts Package
(Colors: Black, Blue, Red, or Dark Bronze)
Oil Fill Plug
Triple Clamps
Bar Risers
Rear Sprocket
Wheel Spacers
Brake Eccentric
Seat Button

Hose Upgrade
(Colors: Blue or Red)
Silicone Radiator Hose Upgrade

Plastic Upgrade
(Colors: Black or White)

Graphic Package Upgrade

Full coverage – Shrouds, Fenders, and Number Plate Backgrounds
Include Name, Number, and Country Flag
2013 Cobra Graphic Add-ons

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