CX50 JR // The bike that changed the game…

22
Loretta Lynn's CX50 JR Championships
300
All US & International Championships
500
Regional Championships
5000
Local Races Won

It's amazing how far these little bikes have come!

Ricky Carmichael

2018 Cobra CX50 JR Specifications

MSRP // $3,998 USD *Plus Shipping
Dry Weight // 81 lbs / 36 Kg
Engine // Cobra Venom 50cc 2-stroke
Bore x Stroke // 39mm x 41.7mm
Induction / Case Reed V-Force® Reed Valve 14mm Carb
Cooling // Water cooled
Clutch // Cobra 5Gx Freewheeling 3-Shoe
Transmission // Single-speed auto
Exhaust // Tuned pipe and silencer
Lubrication // Mixture lubrication– Bel-Ray H1-R
Fuel Capacity // .70 Gallons / 2.6 L
Exhaust // Double Cradle 4130 ChrMo
Wheelbase // 908mm
Seat Height // 607mm
Ground Clearance //216mm
Front Brakes // CARD Hydraulic Disk (160mm)
Rear Brakes // CARD Hydraulic Disk (140mm)
Front Suspension // CARD Smart-Leg 32mm USD Fully Adjustable 170mm travel
Rear Suspension // CARD Adjustable Piggyback 170mm travel
Wheel Front / Rear // Cobra 10” Billet Hard Anodized – Cobra 10” Billet Hard Anodized
               Tires Front / Rear // Dunlop 60/100-10 MX3SF /
Dunlop 70/100-10 MX3S

2018 Cobra CX50 JR Highlights & Improvements

The winning streak continued in 2017 with another U.S. National Championship earned on the CX50JR (that’s 22 in a row, but who’s counting).  For 2018, the littlest Cobras received a ton of refinements. Check them out!:

  • NEW!  CARD Front & Rear Brake Systems – The days of adapting bicycle brakes are over! All Cobra 50s now come equipped with purpose built and designed minicycle brakes that will help take performance to the next level. The all-new CARD front and rear brake systems have better feel, more stopping power, and are easier to maintain. Furthermore, the front brake comes standard with a break-away lever, and there is adjustability and a choice of levers to fit every size of hand!

  • NEW!  Lightweight Wheels – The evolution of our class-leading ‘mag’ wheels continues with reduced weight and all-new super lightweight and cool looking brake discs. To wrap up this awesome package, the engineering geeks at Cobra also replaced all steel wheel bearing spacers with hard anodized 7075-T6 aircraft aluminum units to save a few more grams of un-sprung and rotating mass. Lightweight, ZERO maintenance, and great looking. Lighter wheels mean less rotating and un-sprung mass, which translates into improved acceleration, handling, and flight control.

  • NEW!  Engine  – Both the P3 and JR receive Cobra’s new Venom Series 50cc powerplant for 2017. 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.

  • NEW!  Billet Triple Clamps with Adjustable Bar Mounts – Both little 50cc models receive an all-new top triple clamp this year for increased steering clearance and a roomier rider compartment. Works-level hardware on a junior scale bike!

  • NEW!  Dunlop Geomax MX3S Intermediate-Terrain Tires – The 3S has proven itself to be the ultimate minicycle tire over the past few years, so of course Cobra will offer it as standard equipment. No corners cut here!

  • Venom Series Engine  – The 2018 JR 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.

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

  • 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.

“Why Buy” a 2017 Cobra CX50 JR

  • 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!

  • Optimized chassis and bodywork

    • Longest travel suspension in its class by over an inch

      • Absorbs the pounding of rough terrain for better lap time and a less fatiguing ride.

  • 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

  • Adjustable, 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.

  • Engine / Chassis Package

    • Easy to maintain.

      • No need to remove bodywork or purchase special tools to change a plug or jet the carb!

CX50 JR History

The Cobra CX50JR’s record remains firmly in tact…With Wyatt Thurman’s win in 2017, the Loretta Lynn’s championship run for this little machine was extended to 22 straight years.