Cobra CX50 2014 5R King Owner's Manual
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Cobra CX50 2014 5R King Owner's Manual

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  • Page 2 For parts orders contact your local dealer To locate your closest Cobra dealer log on to www.cobramotorcycle.com or call (517) 437-9100 If you need technical assistance contact your local dealer or call the Cobra Technical Support Hotline at (517) 437-9100...
  • Page 3 THIS BIKE IS INTENDED FOR EXPERIENCED RACERS ONLY AND NOT FOR BEGINNERS. IT IS YOUR RESPONSIBILITY AS THE OWNER OF THIS COBRA MOTORCYCLE OR AS THE PARENT, OR LEGAL GUARDIAN OF THE OPERATOR, TO KEEP THIS COBRA MOTORCYCLE IN PROPER OPERATING CONDITION.

  • Page 4: Table Of Contents

    Table of Contents GENERAL INFORMATION .................. 4 .................... 4 PECIFICATIONS ENERAL ................5 PTIONAL USPENSION OMPONENTS ................. 5 PECIFICATIONS ORQUE ALUES ....................6 REAK ROCEDURE ....................7 TARTING ROCEDURE MAINTENANCE ....................8 ..........................8 ........................9 CHEDULE ............10 EPLACING RANSMISSION LUTCH UBRICANT...
  • Page 5 – F ....................36 ARTS RONT RAKES – F ....................37 ARTS RONT HEEL – P & S ................38 ARTS LASTIC ODYWORK – R ....................39 ARTS RAKE – R ....................40 ARTS HEEL – S ......................41 ARTS HOCK –...

  • Page 6: General Information

    Speed Single Final drive ratio 14/37 T Chain 100 links 420 Transmission / clutch oil type Cobra Venom 3 Shoe Clutch Milk 235 – 350 ml (8 – 12oz) Quantity Chassis Front tire 2.50 - 12 Pressure 16 psi minimum Rear tire 2.75 - 10...

  • Page 7: Optional Suspension Components

    Optional Suspension Components Weight of Rider (lb) Fork Spring Shock Spring Less than 51 0.23 kg/mm gray, 3.5 kg/mm KCCS3223 SCKGFX35 51 - 60 0.25 kg/mm yellow, 3.7 kg/mm KCCS3225 SCKGFX37 Greater than 60 0.27 kg/mm gold, 3.9 kg/mm KCCS3227 SCKGFX39 Specifications - Torque Values Torque Value...

  • Page 8: Break-In Procedure

    Break-In Procedure Your Cobra CX50 King is a close-tolerance high performance machine and break-in time is very important for maximum life and performance. The CX50 can be ridden hard after the first ½ hour break-in time. Cobra recommends Bel-Ray H1-R premix oil with high octane pump gas mixed at 40:1 (150 ml oil to 2 gallons of gas).

  • Page 9: Starting Procedure

    Fenders can be replaced but bruised egos and other body parts take longer. CAUTION: Cobra recommends that you tell your child to take it easy the first couple of minutes in practice until the engine comes up to full operating temperature. CAUTION:...

  • Page 10: Maintenance

    Motorcycle. Tips Recommended lubricants: a. Cobra Clutch Milk is by far the best auto clutch lubricant. It is a full synthetic lubricant that has been specifically formulated for Cobra’s auto clutch and has;  Exceptional film strength over petroleum based oils or synthetic blends.

  • Page 11: Schedule

    The frame is 4130 Chrome Moly and it is important to weld it with the proper rod and heat settings set as light as possible. Cobra recommends replacing the frame with a new one if the old one becomes damaged. Use ER70S6 filler if welding on the frame.

  • Page 12: Replacing Transmission / Clutch Lubricant

    Figure 1 3. After it has drained, reinstall the plug, being sure that the gasket is in place. 4. Reapply oil from oil fill plug 235 cc (8.0 oz) Cobra Venom 3 Shoe Clutch Milk thru the oil fill plug.

  • Page 13: Proper Chain Adjustment

    Proper Chain adjustment Tools required for chain adjustment  19 mm wrench or socket  13 mm wrench or socket 1. Make sure that the rear wheel is aligned properly. 2. For proper adjustment, the chain should have 35 mm (1 3/8”) free movement just behind the chain block with no load on the bike (figure 2) CAUTION:...
  • Page 14 Setting rear brake pedal position (see figure 2b): 1. Loosen the lock nut (10mm wrench). 2. Adjust the brake lever stop (10mm wrench) so that the lever is comfortably reachable in both: a. Standing riding position, and Figure 2b b. Sitting riding position.

  • Page 15: Brake Bleeding Procedure

    Brake Bleeding Procedure Tools Required:  Front: T10 Torx bit/driver, Cobra bleed kit (BCKG0031)  Rear: 3mm hex key (Allen wrench, T10 Torx bit/driver, Cobra bleed kit(BCKG0031) Procedure:  Remove the brake fluid reservoir cover.  Fill the syringe half full with brake fluid.

  • Page 16: Air Filter Cleaning

    CAUTION: Pay particular attention to clean any particles from the airbox between the filter location and the carburetor. NOTE: Cobra has available a carburetor cover that allows easy cleaning of the airbox. 1. Remove the air boot Figure A1 2.

  • Page 17: Fork Maintenance

    Fork Maintenance Cobra strongly recommends that a professional service technician conduct all internal maintenance other than changing springs and oil. This will help to ensure safe and consistent operation.

  • Page 18: Fork Oil Replacement

    Fork Oil Replacement Tools required  32mm Fork Cap Tool (MCMUTL32)  19mm wrench or socket  4 & 5 mm hex key (Allen wrench)  9/16 wrench  Mallet  2.5 wt. Bel-Ray fork oil Disassembly procedure 1. Remove the front wheel (19 mm wrench). 2.

  • Page 19: Frictional Drive (V3 Cfd)

    Frictional Drive (V3 CFD) The Cobra Frictional Drive (CFD) is essentially an adjustable slip clutch that dissipates torque spikes transmitted from the rear wheel to the rest of the drive line and engine. Instead of these torque spikes potentially damaging internal components, the CFD allows the transmission to slip with respect to the engine.

  • Page 20: Parts

    Parts – Airbox & Inlet System Air Box REF # PART # DESCRIPTION RCMU0018 CARBURETOR TCCS0002 AIRBOX SCREW – PLASCREW HCSP0003 RCCS0016 AIR FILTER RETAINER – AIR FILTER RCKG0503 TCC61008 MUDFLAP HOSE CLAMP – AIRBOX TO BOOT MCKGHO03 RCKG0505 AIR BOOT HOSE CLAMP –...

  • Page 21: Parts - Bars And Controls

    Parts – Bars and Controls Bars and Controls REF # PART # DESCRIPTION FAMU0011 HANDLEBAR - ALUMINUM GRIPS (SET OF TWO) – SCOTT WAFFLE TCMU0008 FCMU0066 THROTTLE ASSEMBLY FCPW0004 CABLE COVER FCMU0021 THROTTLE COVER FCMU0019 THROTTLE CABLE BAKG0003 BRAKE ASSEMBLY FRONT FCMU0033 KILL SWITCH ASSEMBLY M8X30mm SOCKET HEAD CAP SCREW (4 REQ’D)

  • Page 22: Parts - Carburetor

    Parts – Carburetor Carburetor REF. # PART # DESCRIPTION RCMU0018 CARBURETOR RCMU0305 SLIDE - #40 RCMU0601 NEEDLE - W7 RCMU0024 ATOMIZER 2.62 AU RCMU00xx MAIN JET, xx denotes size RCMU00xx PILOT JET, xx denotes size RCMU0301 FLOAT RCMU0102 RUBBER CABLE CAP SEAL RCMU0003 CABLE ADJUSTOR RCMU0006 TOP CARB SCREW RCMU0106 CARB TOP...

  • Page 23: Parts - Coolant System

    Parts – Coolant System Coolant System REF # PART # DESCRIPTION FCCS0031 RADIATOR WITH CAP FCMU0022 CAP, 1.3 BAR ECCS0014 RADIATOR HOSE, TOP, LEFT ECCS0010 RADIATOR HOSE, BOTTOM, RIGHT GROMMET, RADIATOR MOUNTING (2 REQ’D) MCC6GR01 M6X12mm FLANGE HEAD BOLT (2 REQ’D) HCBF0612 FLAT WASHER (2 REQ’D) HCWF1478...

  • Page 24: Parts - Electrical System

    Parts – Electrical System Electrical System REF # PART # DESCRIPTION IAMU0005 COIL/CDI W/SPARK PLUG CAP ECMU0010C SPARK PLUG, AUTOLITE COPPERLITE ECMU0010I SPARK PLUG, AUTOLITE IRIDIUM FCMU0033 KILL SWITCH ASSEMBLY M5X16mm SOCKET HEAD CAP SCREW (2 REQ’D) HCBC0516 5mm FLAT WASHER (2 REQ’D) HCWF0501 5mm CLIP NUT (2 REQ’D) HCCN0000...

  • Page 25: Parts - Engine - Bottom End And Transmission

    Parts – Engine – Bottom End and Transmission Engine Bottom End and Transmission REF # PART # DESCRIPTION 1&2 EKCS0003 CRANKCASE SET CMPLT 50cc 2012 KING ZCCS0005 GASKET, CRANKCASE CENTER M6X40mm SOCKET HEAD CAP SCREW (6 REQ’D) HCBC0605 M6X55mm SOCKET HEAD CAP SCREW (1 REQ’D) HCBC0608 M6X45mm SOCKET HEAD CAP SCREW (2 REQ’D) HCBC0606...

  • Page 26: Parts - Engine Clutch And Kick Lever

    Parts – Engine Clutch and Kick Lever...
  • Page 27 Parts – Engine Clutch and Kick Lever Engine – Clutch and Kick Starter REF # PART # DESCRIPTION CAMU0006 CLUTCH COMPLETE CAMU0013 CLUTCH SHOES (SET OF 3) WITH BOLT & WASHERS CCMU0005 CLUTCH ARBOR CAMU0010 SPRINGS, WASHERS & BOLTS (SET OF 3) CLUTCH BOLT (3 REQ’D) HCBS0004 ECMU0018...
  • Page 28 Parts – Engine – Water Pump Engine – Ignition and Water Pump REF # PART # DESCRIPTION EKMU0011 WATER PUMP KIT WITH IMPELLER ECKG0142 SHAFT, WATER PUMP ECKG0072 BEARING, WATER PUMP ECKG0074 SEAL, WATER PUMP SHAFT ECKG0073 IMPELLER, WATER PUMP (ALUMINUM) HCBC1512 M5X12mm SOCKET HEAD CAP SCREW (STAINLESS) BEARING –...

  • Page 29: Parts - Engine - Top End

    Parts – Engine – Top End Engine – Top End REF # PART # DESCRIPTION ECCS0016 CYLINDER KIT (INCLUDES PISTON, RINGS, PIN & CLIPS) ZCMU0011 BASE GASKET (0.25mm) THICK ZCMU0703 BASE GASKET (0.30mm) THICK ZCKG0501 BASE GASKET (0.40mm) THICK ZCMU0705 BASE GASKET (0.50mm) THICK ZCMU0706 BASE GASKET (0.60mm) THICK...

  • Page 30: Parts - Exhaust System

    Parts – Exhaust System Exhaust System REF # PART # DESCRIPTION XACS2013 EXHAUST PIPE HEADER PIPE O-RINGS (2 REQ’D) ZCMOTE11 XCMU0005 EXHAUST SPRING - SHORT XCMU0033 ISOLATION MOUNT M6X12mm FLANGE HEAD BOLT (2 REQ’D) HCBF0612 6mm CLIP NUT – FOR FRONT PIPE MOUNT HCHA0003 PIPE GROMMET WASHER (2 REQ’D) HCWF1478...

  • Page 31: Parts - Forks & Triple Clamps

    Parts – Forks & Triple Clamps Front Forks and Triple Clamp REF # PART # DESCRIPTION KACS2014 FORK COMPLETE, BRAKE & NON-BRAKE SIDE KCMU0011 FORK GUARD SET M6X16mm, SOCKET HEAD CAP SCREW (4 REQ’D) HCBC0601 WASHER FORK GUARD (4 REQ’D) TCC60019 BCC60015 BRAKELINE CLAMP...

  • Page 32: Parts - Forks - Leg Assembly - Brake Side

    Parts – Forks – Leg Assembly – Brake Side...
  • Page 33 Parts – Forks – Leg Assembly – Brake Side REF # PART # DESCRIPTION HCBC0408 4 X 8 SHCS CLEAR ZINC ZCKG0001 GASKET, BLEED SCREW FORK KCCS0004C FORK CAP - CONVENTIONAL 32MM USD ZCMUOR18 O-RING PV SOLENOID - CX65 KCCS0036 FORK - SPRING WEAR PLATE 32MM KCCS0005 FORK - OUTER TUBE 32MM...

  • Page 34: Parts - Forks - Leg Assembly - Non-Brake Side

    Parts - Forks – Leg Assembly – Non-brake Side...
  • Page 35 Parts - Forks – Leg Assembly – Non-brake Side REF # PART # DESCRIPTION HCBC0408 4 X 8 SHCS CLEAR ZINC ZCKG0001 GASKET, BLEED SCREW FORK KCCS0004S FORK CAP - CONVENTIONAL 32MM USD ZCMUOR18 O-RING PV SOLENOID - CX65 KCCS0036 FORK - SPRING WEAR PLATE 32MM KCCS0005 FORK - OUTER TUBE 32MM...

  • Page 36: Parts - Framei

    Parts – Frame I Frame REF # PART # DESCRIPTION FACS2012 FRAME KING TCC60018 SEAT MOUNT SPACER HCBC0625 M6X25mm SOCKET HEAD CAP SCREW HCHA0003 6mm CLIP NUT (MOUNTS TO FENDER TO HOLD SEAT) PLASCREW AIRBOX MOUNTING (2 REQ’D) HCSP0003 WASHER – 5mm BODY PANEL (2 REQ’D) TCC60017 HCBC0514 M5X14mm SHCS...
  • Page 37 Parts – Frame II Frame REF # PART # DESCRIPTION HCBC0503 M5X30mm SOCKET HEAD CAP SCREW FT TANK MOUNTING SPACER – FT TANK MOUNTING TCC60027 M5X16mm SOCKET HEAD CAP SCREW (2 REQ’D) HCBC0516 5mm FLAT WASHER (2 REQ’D) HCWF0501 HCCN0000 5mm CLIP NUT (MAY NOT BE USED) M5X14mm SOCKET HEAD CAP SCREW (2 REQ’D) HCBC0514...

  • Page 38: Parts - Front Brakes

    Parts – Front Brakes Front Brakes REF# PART # DESCRIPTION BAKG0003 FRONT BRAKE ASSEMBLY HOSE – BRAKE FRONT BCKG0030 BCKG0023 ALLOY BRAKE LEVER BCKG0024 BRAKE PERCH & MASTER CYLINDER ASSY W/ LEVER CALIPER – FRONT BCKG0029 KIT BRAKE PADS, WITH “E” CLIP BKKG0001 BRAKE ROTOR –...

  • Page 39: Parts - Front Wheel

    Parts – Front Wheel Front Wheel REF # PART # DESCRIPTION WAKG0022 FRONT WHEEL W/BEARINGS AND SPACER WCKG1200D 12" X 2.50 FRONT TIRE DUNLOP MX51 WCKG1201 12" FRONT TUBE WCMU0016 FRONT AXLE ECMU0040(T) SHIM - OPTIONAL FOR BRAKE CALIPER ALIGNMENT WCMU0101 FRONT WHEEL SPACER, LARGE WCMU0120...

  • Page 40: Parts - Plastic Bodywork & Seat

    Parts – Plastic Bodywork & Seat Plastic and Seat REF # PART # DESCRIPTION TCMU0016 FRONT FENDER - YELLOW FRONT FENDER x – DENOTES COLOR BLK, WHT, YEL, FLO TCMU0016x HCBF0616 FRONT FENDER MTG BOLTS (4 REQD) TCC60002W FRONT NUMBER PLATE - WHITE FRONT NUMBER PLATE x –...

  • Page 41: Parts - Rear Brake

    Parts – Rear Brake Rear Brake System REF # PART # DESCRIPTION BRAKE SYSTEM – REAR (M/C-LINE-CALIPER) BAKG0002 BCMU0027 BRAKE PIVOT BOLT SEAL – BRAKE PEDAL (2 REQ’D) BCMU0501 BCMU0023 BRAKE PEDAL BCMU0023T TOE PIECE HCBC0501 M5X 12mm SOCKET HEAD CAP SCREW BCDCBU01 BUSHING REAR BRAKE PEDAL BCMUSP02...

  • Page 42: Parts - Rear Wheel

    Parts – Rear Wheel Rear Wheel REF # PART # DESCRIPTION WAKG2007R REAR WHEEL W/BEARINGS AND SPACER TIRE – REAR 10X2.75” DUNLOP MX51 WCMU1075D WCMUTU10 TUBE, 10" PCMU0001 MASTER LINK 420 PCMU0100 CHAIN 420 X 100 PCMU0137 37T SPOCKET (STANDARD) PCMU01xx SPROCKET - xx denotes number of teeth (35-45) HCBH0702...

  • Page 43: Parts - Shock

    Parts – Shock Shock REF # PART # DESCRIPTION SHOCK ABSORBER – KING SACS2011 SHOCK - BEARING SPHERICAL SHOCK MOUNT–CARD (2 REQ’D) SCMU0043 O-RING - SHOCK - BUSHING – CARD (4 REQ’D) SCMU0039 SHOCK - MOUNT BUSHING – CARD (4 REQ’D) SCMU0042 SCMU0058 SHOCK - WHITE NYLON TIP SETSCREW M6-1.0 - CARD...

  • Page 44: Parts - Shock - Inside

    Parts – Shock - Inside Shock REF # PART # DESCRIPTION SCMU0037 O-RING LOW SPEED COMP ADJUSTER SCMU0038 O-RING HIGH SPEED COMP ADJUSTER SCMU0036 O-RING COMP ADJUSTER CAP SCC60007 O-RING COMPRESSION ADJUSTER SCMU0051 O-RING - IFP SCMU0052 IFP SEAL BAND SCMU0033 O-RING SHOCK BASE SCMU0050...

  • Page 45: Parts - Swingarm Assembly

    Parts – Swingarm Assembly Swingarm REF # PART # DESCRIPTION GACS2010 SWINGARM HCBH1203 M12 SWINGARM PIVOT BOLT HCNL1201 M12 SWINGARM LOCK NUT SWINGARM BUSHING (4 REQ’D) GCMU0001 PAKG0001 CHAIN GUIDE ASSEMBLY COMPLETE M6X40mm FLAT HEAD SCREW (2 REQ’D) HCBFT640 M6 LOCKNUT (2 REQ’D) HCNL0601 M6X20mm FLANGE HEAD BOLT (2 REQ’D) HCBF0620...

  • Page 46: Service

     There appears to be a wide range of variability in reading compression gauges across the country.  The head volume of this Cobra Motorcycle is very small and so requires many kicks ~20 before you establish the most accurate reading possible.

  • Page 47: Base Gasket Selection

     1mm flexible solder material  measurement calipers When rebuilding the ‘top end’ of your Cobra motorcycle, care must be taken to ensure the proper squish clearance. Squish clearance is defined as the minimum distance between cylinder head and piston at TDC, and there are negative effects of either having too much or too little clearance.
  • Page 48 If during the course of the maintenance more parts than the base gasket are changed, the squish clearance should be measured, and possibly a different base gasket will be required. The easiest way to measure squish clearance is with 1mm to 1.5mm thick flexible solder wire (available through most popular electronic stores).

  • Page 49: Engine Removal

    3. Using a flywheel holding tool and 14 mm socket remove the nut that secures the flywheel. 4. Using the Cobra flywheel / clutch puller (#MCMUTL68), remove the flywheel from the crankshaft. 5. Remove the stator (4mm hex key).

  • Page 50: Top End Disassembly Procedure

    CFD gear stop (#EAMU0004) and a 19mm socket. 7. Remove the clutch nut / starter gear that holds on the clutch (#ECMU0078). 8. With the Cobra flywheel / clutch puller (#MCMUTL68), remove the clutch from the crankshaft (details in Clutch Service portion of this manual).

  • Page 51: Splitting The Cases

    INSPECTION NOTE: Piston ring end gap should be between 0.006” (0.16 mm) and 0.020” (0.5 mm) Splitting the Cases 1. Remove the fasteners holding the two halves of the crankcase together. 2. Separate the cases with a proper case splitting tool. CAUTION: Take caution when handling the crankshaft.
  • Page 52 CAUTION: Be sure to install the piston such that the arrow on the top piston surface points to the exhaust (front of bike/engine) and put assembly lube on the connecting rod bearing. 11. Install the piston rings. CAUTION: Ring end gap should be no less than 0.006” (0.016mm) and no more than 0.020” (0.5mm).

  • Page 53: Clutch

    1/8 to ¼ turn). Clutch New in 2011, Cobra improved the clutch washer design. The new washer stacks have taller springs but are overall shorter and have a single thin shim. These new washer stacks are being double sorted at the factory. They are first sorted by measured height.
  • Page 54 Clean the washers and bolt if you intend to reuse. The spring stacks in your Cobra clutch will contain 11 individual springs and flat washer(s) configured as a 5 ½ stack. See figure 32. This clutch is designed such that it reconfigured by the customer to achieve different clutch engagements ‘hits’...
  • Page 55 VARIED Clutch adjustment washers Your Cobra comes stock with flat washer(s) at the bottom of the spring washer stack. Cobra offers several thicknesses of thin adjustment washers that allow clutch engagement tuning. Increasing the flat washer(s) thickness increases the engine speed for clutch engagement thus increasing the abruptness of clutch engagement (harder hit).
  • Page 56 Clutch shoe wear:  This can be measured by the overall diameter of the shoes installed on the arbor. This measurement should be greater than 80.5mm  If the clutch has been slipping and shows signs of glazing, it is best to replace the shoes.

  • Page 57: Ignition

    Using one hand rotate the kick lever to ½ stroke and hold while tightening the six screws completely with the other hand. 8. Fill with oil (235 ml (8.0 oz) Cobra 3 Shoe Clutch Milk (Part # MCMUGF32). Ignition Stator care Stator failure could result from running the bike hot.

  • Page 58: Cooling System

    CAUTION: Advancing the ignition timing will cause the engine to run hotter, in-turn causing power loss, shortened clutch life, and possibly lead to premature stator failure, and can also cause detonation which can lead to premature piston and ring failure. Tools recommended for timing service: ...
  • Page 59  single and double hook ends for removing plastic impeller  Dead blow hammer COBRA IMPELLER SERVICE INSTRUCTIONS 1. Remove radiator cap and drain engine coolant as described above. NOTE: If the impeller is damaged or broken completely back flush the coolant system to ensure no solid pieces are in the system.
  • Page 60 CAUTION: Damage may occur if one attempts to install the water pump and the device is not orientated correctly. If the tool does not sit flat against the cases, the orientation of the tool to the engine is not correct. Make sure that the top alignment pin is in the 2 unthreaded hole, the bottom alignment pin is also in the 2 unthreaded hole, and that the relief for the stator bolt head is oriented toward the stator.

  • Page 61: Fuel & Air System

     WD-40  8mm socket Your Cobra is equipped with an adjustable carburetor. Some fine-tuning may be needed according to weather condition and altitude. Proper jetting is very important for engine performance and engine life. Serious damage to the engine can occur if not properly adjusted.
  • Page 62 potentially causing an expensive top end rebuild and a DNF. To richen the carburetor: 1. Change the main jet one number at a time (larger). 2. Lower the needle clip (raising the jet needle) one notch at a time until the engine starts to blubber on the top end, then move the clip back up one notch or until you get the blubber out.

  • Page 63: Exhaust

    Take the reed cage out and hold it up to the light and look in through the cage. If you see light, it is not necessarily a bad thing, but the pedals may need to be replaced. Bikes have been known to run real well with light visible past the reed tips as long as the jetting proper for the conditions.

  • Page 64: Front Forks

    Contaminated pads must be replaced.  Ensure that the brake caliper is centered over the brake rotor. It a correction is needed, Cobra has thin brake shims to help make minor adjustments in alignment.  Always leave adequate free-play in the lever or pedal.

  • Page 65: Rear Shock

    See Optional Components section of this manual for details on these and other optional components for your Cobra Motorcycle. Rear Shock The rear shock is fully serviceable but it is recommended that only trained professionals should service your shock. Contact Cobra for questions and service of your CX50 SR shock.

  • Page 66: Tuning

    Tuning Clutch There are performance characteristics to observe and things to measure. 1) Performance characteristics to observe a) Clutch coming in too late i) Engine rev’s to a high RPM before moving the motorcycle ii) Clutch never fully engages on a reasonable straight stretch iii) Basket turns blue in short amount of time b) Clutch coming in too early i) Motorcycle moves too soon when accelerating off idle...
  • Page 67 2. Spring rate too high (wrong configuration with proper stack height) 3. Clutch arbor shoulder bolt is too short 4. Clutch shoe material has worn too thin 5. Clutch basket has worn too much and is too large of a diameter With the exceptions of component failures, generally two things will occur: 1) The clutch shoes will wear causing the clutch to engage later, and 2) The springs will sack causing the clutch to engage earlier.
  • Page 68 A: If it is blue or purple, replace it. If it is silver or brown, you are fine. Cobra is now going to greater lengths to ensure that the clutch on your motorcycle is performing the best possible from the shop and so it may have a different clutch stack or shim washer from what you are used to.

  • Page 69: Gearing

    Gearing For a bike with a centrifugal clutch, it’s better to be geared too low than too high. What happens with improper gearing?  Poor performance Condition Gear Taller Gear Lower  Not enough top end speed  No snap Sand ...

  • Page 70: Suspension

    Suspension Adjustment 1. Front forks 1.1. Fork oil 1.1.1. Oil type Heavier weight oil – more damping – slower responding 1.1.1.1. Lighter weight oil – less damping – quicker responding 1.1.1.2. 1.1.2. Oil quantity / level Greater quantity / higher level – greater bottoming resistance, stiffer 1.1.2.1.

  • Page 71: Fork Damping Adjustments

    Front Fork Operation The front suspension on the CX50SR works under the principals of hydraulic damping, and it features full adjustability to help tune the fork to meet each rider’s needs. The CARD fork contains MXT ‘Smart Leg’ technology that provides very progressive operation; allowing a small bike to perform well on track surfaces ripped up by larger machines.

  • Page 72: Rear Shock Adjustments

    The Smart Leg cap is labeled “Speed Sensitive Bottoming Control”, and this adjuster provides a range of control over how progressive the fork feels. Turning the screw clockwise increases the fork’s resistance to bottoming, while turning the screw counter- clockwise decreases it. On the track, this effect will be felt on sections where the fork is forced to move very quickly such as on harsh landings or when traversing sharp edged bumps.

  • Page 73: Carburetion

    12. Adjustment of compression damping Carburetion Although your Cobra is sent from the factory with the carburetor jetted for optimal performance, you may find it necessary to adjustment your particular jetting due to current weather conditions, altitude, fuel variations, and/or engine modifications.
  • Page 74 NOTE: Perform all jetting changes on a motorcycle that has been warmed up to proper operating temperature. The carburetor on your Cobra motorcycle is quite adjustable. Figure 49 shows its range of adjustment and in particular what adjustable component affects what range of operation (specifically throttle position).
  • Page 75 TOP END JETTING: Adjust for clean full throttle acceleration Jet your top end (main jet) based on the acceleration of your Cobra Motorcycle on the longest straight at the track. Observe any of the lean or rich symptoms (spark plug appearance and bike performance) listed above and change your jetting accordingly.

  • Page 76: Troubleshooting

    Troubleshooting 1) Engine operates erratically a) Carburetor top is installed backwards b) The carburetor slide indexing pin is missing c) A carburetor vent elbow is plugged or has fallen out d) Faulty stator e) An air leak i) Base gasket ii) Intake / reed gaskets iii) Crank seals iv) Crank case gasket...
  • Page 77 b) Carburetor is dirty c) Ignition i) Spark plug fouled ii) Spark plug cap off iii) Engine Shut-off ‘kill’ switch is shorted iv) Bad electrical ground v) Stator winding damaged d) Exhaust is plugged with object of flooded fuel e) Engine is flooded f) Cracked, broken, or jammed reed pedal g) Excessive piston or cylinder wear h) Clutch bolt or shoe dragging on basket (drum).

  • Page 78: Index

    Service ........59 Bleeding ........13 Specifications ......4 Parts .......... 36 Tunning ........71 Front Wheel Parts ......37 Gearing ......... 67 CFD Cobra Frictional Drive ... 17 Ignition Chain Parts .......... 22 Adjustment ........ 11 Service ........55 Chassis Timing ........
  • Page 79 Rear Wheel Suspension Parts .......... 40 Adjustment ......... 68 Adjustment ........ 61 Swingarm Reeds ........... 60 Parts .......... 43 Shock Top End Parts .......... 41 Parts .......... 27 Adjustment ........ 70 Service ........44 Slip Clutch ........17 Torque Values ......... 5 Spark Plug Transmission Lubricant Recommended ......

This manual is also suitable for:

Cx50 sr

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