Cobra 2006 King 50 Owner's Manual
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Cobra 2006 King 50 Owner's Manual

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2006 King 50
Owners
Parts
Service
Tuning

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Summary of Contents for Cobra 2006 King 50

  • Page 1 2006 King 50 Owners Parts Service Tuning...
  • Page 2 For parts orders contact your local dealer To locate your closest Cobra dealer log on to www.cobramotorcycle.com or call (330) 549-9600 If you need technical assistance contact your local dealer or call the Cobra Technical Support Hotline at (330) 549-9603 Cobra Motorcycle MFG., Inc.
  • Page 3 “WARNING” THE COBRA KING IS A COMPETITION MODEL ONLY AND IS NOT MANUFACTURED FOR, NOR SHOULD IT BE USED ON PUBLIC STREETS, ROADS OR HIGHWAYS.

  • Page 4: Table Of Contents

    Table Of Contents GENERAL INFORMATION ....................5 ...................5 PECIFICATIONS ENERAL ....................6 PTIONAL OMPONENTS ................7 PECIFICATIONS ORQUE ALUES ....................8 REAK ROCEDURE ....................9 TARTING ROCEDURE ......................10 ENERAL MAINTENANCE ......................10 & T ......................10 CHEDULE ............12 EPLACING RANSMISSION LUTCH UBRICANT ......................13 HAIN ADJUSTMENT ..................13 RAKE AINTENANCE ....................15 ILTER...
  • Page 5 – F ....................34 ARTS RONT HEEL – P & S ................35 ARTS LASTIC ODYWORK – R ....................36 ARTS RAKE – R ....................37 ARTS HEEL – S ......................38 ARTS HOCK – S ..................39 ARTS WINGARM SSEMBLY – S ..................39 ARTS WINGARM SSEMBLY SERVICE .........................40 ......................40...

  • Page 6: General Information

    Main Jet 96 Slow (Pilot) jet 65 Float Height 16mm + 0.5mm (0.63” + 0.020”) Transmission Speed Single Final drive ratio 14/38 T Chain 100 links 420 Transmission / clutch oil type Cobra Venom 3 Shoe Clutch Milk Quantity 235 ml (8.0oz)

  • Page 7: Optional Components

    2.75 - 10 Pressure 16 psi min. (20 psi for hard pack or rocky conditions) Front fork Cobra 30mm USD Fork oil type SAE 7 weight Fork oil amount 107 ml (3.6oz) Optional Components Call your dealer, or the factory, for details •...

  • Page 8: Specifications - Torque Values

    Specifications - Torque Values Torque Value Size & Fastener Remarks ft-lb in-lb Cylinder head M6 x 1.0 nuts Crankcase M6 x 1.0 bolts Spark plug (SP) (SP) (SP) M14 x 1.25 Stator bolts M5 X 0.8 Stator cover M4 X 0.75 bolts Clutch cover M6 X 1.0...

  • Page 9: Break-In Procedure

    Break-In Procedure Your Cobra KING is a close-tolerance high performance machine and break-in time is very important for maximum life and performance. The KING can be ridden hard after the first ½ hour break-in time but it is recommended that no adjustments are made to the carburetion or suspension until the full 8 hours of bike break-in has elapsed.

  • Page 10: Starting Procedure

    (reserve position is horizontally forward) CAUTION: For best results from your Cobra Motorcycle use only the recommended fuels. Testing has shown that most ‘race’ fuels actually degrade performance. When your pre-ride inspection is complete the bike may be started. For a cold engine follow this procedure.

  • Page 11: General Tips

    General Tips Always wear a helmet and other protective riding gear. 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. Make sure your riders’ foot is not resting on the foot brake while they are...
  • Page 12 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.

  • Page 13: Replacing Transmission / Clutch Lubricant

    Figure 1 4. After it has drained, reinstall the plug, being sure that the gasket is in place. 5. Reapply oil from oil fill plug 235 cc (8.0 oz) Cobra Venom 3 Shoe Clutch Milk thru the oil fill plug.

  • Page 14: Chain Adjustment

    Cobra’s specially developed Cobra Venom 3 Shoe Clutch Milk (Part # MCMUGF01) was formulated to provide superior lubrication and cooling capability over extended periods of time and is the recommended lubricant for your Cobra motorcycle. Chain adjustment 1. Make sure that the rear wheel is aligned properly.
  • Page 15 Figure 2b CAUTION: Adequate pedal free play is required so that the brake pads do not drag on the rotor. 1” MINIMUM. Make sure that the free play locking clip is installed such that one must push forward, toward the front of the bike, to remove. Otherwise the clip is apt to come undone while riding.

  • Page 16: Air Filter Cleaning

    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 2. Install the cover (RCMU0109) over the carburetor inlet 3.
  • Page 17 NOTE: It’s very important to oil your filter consistently each time because varied amounts of oil will change your carburetor jetting. 4. Apply grease to the black sealing surface of the filter and reinstall as in figure Figure A2 5. Squeeze the two finger tabs together on the wire retainer and install into the airbox while aligning the bottom guiding tabs “legs”...

  • Page 18: Fork Oil Replacement

    7. Press each side arm into their respective holes one at a time with each finger tab. Figure A5 Figure A6 8. When properly installed, the filter and retainer should look like figure A7, with the filter material extending beyond the perimeter of the wire retainer Figure A7 NOTE: Make sure you change or clean your filter after each moto.
  • Page 19 • 4 & 5 mm hex key (Allen wrench) • 25mm wrench or socket • 7 wt fork oil Disassembly procedure 1. Remove the front wheel (19 mm wrench). 2. Remove the brake caliber from the fork leg (4 mm hex key). 3.

  • Page 20: Parts

    Parts Parts – Airbox & Inlet System Figure 5 Coolant System REF # PART # DESCRIPTION RCKG0001 AIRBOX HCBF0616 M6X16 FLANGE HEAD BOLT RCKG0512 AIR FILTER RCKG0503 FILTER RETAINER TCKG0004 MUDFLAP – AIRBOX TCKG0105 BRACKET – MUDFLAP HCBB0612 M6X12 BUTTON HEAD BOLT MCKGHO03 HOSE CLAMP –...

  • Page 21: Parts - Bars And Controls

    Parts – Bars and Controls Figure 3 Bars and Controls REF # PART # DESCRIPTION TCMU0402 HANDLEBAR - ALUMINUM MCMU0001 OPTIONAL CROSS BAR PAD TCMU0008 GRIPS (SET OF TWO) FCMU0066 THROTTLE ASSEMBLY FCMU0068 THROTTLE COVER SHOWN BCKG0023 ALLOY BRAKE LEVER W/BALL BCKG0024 BRAKE PERCH ASSY W/LEVER &...

  • Page 22: Parts - Carburetor

    Parts - Carburetor Carburetor REF. # PART # DESCRIPTION RCMU0305 CARB SLIDE RCMU0601 NEEDLE RCMU00 ATOMIZER 2.62 AU RCMU0096 MAIN JET RCMU0065 PILOT JET CHOKE JET RCMU0301 FLOAT RCMU0102 RUBBER CABLE CAP SEAL RCMU0003 CABLE ADJUSTOR RCMU0006 TOP CARB SCREW RCMU0106 CARB TOP ZCMU0007...

  • Page 23: Parts - Coolant System

    Parts – Coolant System Figure 5 Coolant System REF # PART # DESCRIPTION FCKG0036 RADIATOR WITH CAP FCMU0047 RADIATOR CAP (2 ears or ribbed) MCMUHO05 RADIATOR HOSE, TOP, LEFT MCKGHO02 RADIATOR HOSE, BOTTOM, RIGHT MCMUGR03 MOUNTING GROMMET (3 PER) FCMU0006 RADIATOR MOUNTING BRACKET (TEARDROP) HCBF0616 FLANGE HEAD BOLT M6X16...

  • Page 24: Parts - Electrical System

    Parts – Electrical System Figure 6 Electrical System REF # PART # DESCRIPTION IAMU0005 COIL W/SPARK PLUG CAP ECMU0065 SPARK PLUG, CHAMPION (8339-1) ECMU0067 OPTIONAL HOTTER PLUG (8332-1) ECMU0066 OPTIONAL COLDER PLUG (8904-1) FCMU0033 KILL SWITCH ASSEMBLY HCBC0516 SCREW, M5 X 16 (2 PER) HCCN0000 5MM CLIP NUT (2 PER) ICMU0018...

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

    Parts – Engine – Bottom End and Transmission Figure 7A Engine Bottom End and Transmission REF # PART # DESCRIPTION ECKG0032 CRANKCASE, IGNITION SIDE no bearings ECKG0033 CRANKCASE, CLUTCH SIDE, no bearings ZCMU0601 GASKET, CRANKCASE CENTER HCBC0605 6X40MM SOCKET HEAD CAP SCREW (6 REQ’D) HCBC0608 6X55MM SOCKET HEAD CAP SCREW (1 REQ’D) HCBC0606...

  • Page 26: Parts - Engine Clutch And Kicker

    Parts – Engine Clutch and Kicker Figure 7B Engine – Clutch and Kick Starter REF # PART # DESCRIPTION CAMU0005 CLUTCH COMPLETE CAMU0013 CLUTCH SHOES (SET OF 3) WITH BOLT & WASHERS CCMU0029 CLUTCH ARBOR CAMU0010 SPRINGS, WASHER & BOLT (SET OF 3) HCBS0004 CLUTCH BOLT (3 REQ’D) ECMU0018...

  • Page 27: Parts - Engine - Ignition And Water Pump

    Parts – Engine – Ignition and Water Pump Figure 7C Engine – Ignition and Water Pump REF # PART # DESCRIPTION EKMU0001 WATER PUMP KIT ECKG0142 SHAFT, WATER PUMP ECKG0072 BEARING, WATER PUMP ECKG0074 SEAL, WATER PUMP SHAFT ECKG0073 IMPELLER, WATER PUMP ECKG0004 RETAINER, WATER PUMP ASSEMBLY HCBB0003...

  • Page 28: Parts - Engine - Top End

    Parts – Engine – Top End Figure 7D Engine – Top End REF # PART # DESCRIPTION ECMU0052 CYLINDER ZCKG0501 BASE GASKET ECMU0060 PISTON KIT ECMU0155 PISTON RINGS (2 PER SET) ECMUSR00 SNAP RING FOR PISTON (2 REQ'D) ECKG0012 WRIST PIN ECMU0077 BEARING, WRIST PIN ZCMUOR07...

  • Page 29: Parts - Exhaust System

    Parts – Exhaust System Figure 8 Exhaust System REF # PART # DESCRIPTION XCKG2005 2005 KING EXHAUST PIPE ZCMOTE11 HEADER PIPE O-RINGS (2 REQ’D) XCMU0005 EXHAUST SPRING - SHORT MCMUGR06 PIPE GROMMET MALE MCMUGR07 PIPE GROMMET FEMALE MCMUSP02 PIPE GROMMET SPACER HCWF1478 PIPE GROMMET WASHER (2 REQ’D) HCBF0635...

  • Page 30: Parts - Forks & Triple Clamps

    Parts – Forks & Triple Clamps Figure 12 Front Forks and Triple Clamp REF # PART # DESCRIPTION KAKG0020 FORK COMPLETE, NON-BRAKE SIDE KAKG0021 FORK COMPLETE, BRAKE SIDE KCKG0140 FORK GUARD SET KCKG0140 FORK GUARD SET MCMUZT04 CABLE TIE (2 REQ’D) HCBB0612 M6X12, BUTTON HEAD SCREW (4 REQ’D) FAKG0010...

  • Page 31: Parts - Forks - Leg Assembly

    Parts – Forks – Leg Assembly Figure 13 Fork Leg Assembly REF # PART # DESCRIPTION HCBC0408 M4 X 8 SHCS (BLEED SCREW) ZCKG0001 GASKET BLEED SCREW KCKG0047 FORK CAP KCKG0121 FORK LEG OUTER KCKG0051 BUSHING FORK LEG KCKG0007 FORK SEAL KCKG0052 WIRE FORK ASSY RETAINING KCKG0008...

  • Page 32: Parts - Frame I

    Parts – Frame I Figure 9 Frame REF # PART # DESCRIPTION FAKG0011 FRAME 2005 KING HCBF0616 M6X16 FLANGE HEAD BOLT HCHA0003 6MM “U” NUT TCKG0007 PLUG – FRAME END MCMU0003 STRAP – HANDLE HCBF0620 M6X20 FLANGE HEAD BOLT HCHA0003 6MM “U”...

  • Page 33: Parts - Frame Ii

    Parts – Frame II Figure 10 Frame REF # PART # DESCRIPTION FAKG0011 FRAME 2005 KING HCBF0616 M6X16 FLANGE HEAD BOLT HCNK0001 KNOB – SEAT FASTENING HCBB0516 M5X16 BUTTON HEAD BOLT HCWP0002 ALUMINUM WASHER HCBB0516 M5X16 BUTTON HEAD BOLT HCCN0000 5 MM CLIPNUT HCBF0620 M6X20 FLANGE HEAD BOLT...

  • Page 34: Parts - Front Brakes

    Parts – Front Brakes Figure 18 Front Brakes REF# PART # DESCRIPTION BAKG0003 FRONT BRAKE ASSEMBLY BCKG0030 HOSE – BRAKE FRONT BCKG0023 ALLOY BRAKE LEVER BCKG0024 BRAKE PERCH & MASTER CYLINDER ASSY W/ LEVER BCKG0029 CALIPER – FRONT BKKG0001 BRAKE PADS, WITH “E” CLIP BCMU0503 BRAKE ROTOR HCBB0516...

  • Page 35: Parts - Front Wheel

    Parts – Front Wheel Figure 19 Front Wheel REF # PART # DESCRIPTION WAKG0022 FRONT WHEEL COMPLETE WCKG1200 12" FRONT TIRE WCKG1201 12" FRONT TUBE WCKG0011 FRONT AXLE WCMU0123 FRONT WHEEL SPACER, X LARGE WCMU0120 WHEEL BEARING (2 REQD) WCMU0032 WHEEL BEARING SPACER WCMU0101 FRONT WHEEL SPACER, LARGE...

  • Page 36: Parts - Plastic Bodywork & Seat

    Parts – Plastic Bodywork & Seat Figure 20 Plastic and Seat REF # PART # DESCRIPTION TCMU0016 FRONT FENDER HCBF0616 FRONT FENDER MTG BOLTS (4 REQD) NOT SHOWN TCMU0005 FRONT NUMBER PLATE HCBF0625 FRONT NUMBER PLATE MTG BOLT NOT SHOWN TCMU0006 FUEL TANK (NO PETCOCK OR CAP) HCBF0616...

  • Page 37: Parts - Rear Brake

    Parts – Rear Brake Figure 21 Rear Brake System REF # PART # DESCRIPTION BAKG0002 BRAKE COMPLETE BCMU0012 BRAKE PEDAL BCDC0009 BRAKE PIVOT BOLT HCBH0620 M6X20 HEX HEAD BOLT HCNS0601 6 MM NUT BCMUSP02 BRAKE RETURN SPRING BCMU0501 SEAL – BRAKE PEDAL (2 REQ’D) BCDC0004 PUSH ROD, REAR BRAKE HCBF0620...

  • Page 38: Parts - Rear Wheel

    Parts – Rear Wheel Figure 22 Rear Wheel REF # PART # DESCRIPTION WAKG0020 REAR WHEEL W/BEARINGS WCMU1275 REAR TIRE, VEE RUBBER 2.75X10 WCMUTU10 TUBE, BRIDGESTONE 10" BCMU0502 BRAKE ROTOR HCBB0620 M6X20 BUTTON HEAD CAP SCREWS (5 REQD) PCMU0138 38T STEEL REAR SPROCKET (NO DAMPERS) WCMU0020 WHEEL BEARING BRAKE SIDE HCBH0702...

  • Page 39: Parts - Shock

    Parts – Shock Figure 23 Shock REF # PART # DESCRIPTION HCBF1040 M10 X 40 HEX HEAD BOLT SCKGFX04 PRELOAD RING BOTTOM SCKGFX05 PRELOAD RING TOP (LOCK RING) SCKGFX37 SHOCK SPRING 3.7 KG/MM (STANDARD) SCKGFX35 SHOCK SPRING 3.5 KG/MM (LIGHT) SCKGFX39 SHOCK SPRING 3.9 KG/MM (HEAVY) SCKGFX03...

  • Page 40: Parts - Swingarm Assembly

    Parts – Swingarm Assembly Figure 24 Swingarm REF # PART # DESCRIPTION GAKG2004 SWINGARM ASSEMBLY COMPLETE GAKG0002 SWINGARM PAINTED HCBH1403 SWINGARM PIVOT BOLT HCNL1402 SWINGARM LOCK NUT (M14 X1) GCMU0001 SWINGARM BUSHING (4 PER) GCMU0005 TOP SWINGARM GUARD (CHAIN SLIDER) HCBB0803 M8X40 BUTTON HEAD BOLT HCWF5601...

  • Page 41: 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 42: Engine Removal

    dropped to 90% of its original value the engine will be down on power and would benefit from a rebuild. When it’s dropped to 80% it really needs rebuilt! Using the table below will help you determine monitor the condition of your top end. Engine is Fresh Engine Down on Power Engine NEEDS Rebuilt...

  • Page 43: Complete Engine Disassembly Procedure

    7. Remove the special nut / starter gear that holds on the clutch (special tool available, contact your local dealer). 8. With the Cobra flywheel / clutch puller (#MCMUTL68), remove the clutch from the crankshaft (details in Clutch Service portion of this manual).

  • Page 44: Splitting The Cases

    INSPECTION NOTE: Inspect the cylinder head for deposits and abrasions. 1. If there are deposits they should be removed a. Black oily deposits (indicating a rich mixture or improper oil type/quantity) can be removed with solvent b. Crusty deposits (indicating dirt ingestion) can be removed with solvent and may require some scraping.

  • Page 45: Engine Assembly

    CAUTION: Take caution when handling the crankshaft. It is the main power transfer to the rest of the engine. If it is out of alignment, it will cause premature failure of your bearings which can lead to serious damage to the cylinder as well as the rest of the engine.
  • Page 46 9. Torque to 12 Nm (105 in-lb) in the pattern shown in figure 28. 10. Trim away any excess gasket material if necessary. NOTE: Check engine mount holes for excess material that may cause problems in engine installation. 11. Install the piston with new wrist pin bearing and, pin and clips. CAUTION: Be sure to align 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...

  • Page 47: Clutch

    Clutch CAUTION: The clutch components (arbor, shoes, bolt, and belleville washers) on your 2006 Cobra are similar looking but different in geometry from prior years. Do not mix old and new parts as damage will occur. Cobra clutch puller assembly:...
  • Page 48 Generally reassemble the springs as you removed them from the engine or as you received them from Cobra. This will be either a 3, 4 ½ or, 5 stack. If you are unsure call the Cobra Technical Support Group 330 549 9600, and consult the experts.
  • Page 49 0.79mm (0.031”) Clutch adjustment washers Your Cobra comes stock with a single flat washer at the bottom of the spring washer stack. The thickness of that flat washer is 0.031” (0.79mm). Cobra offers several thicknesses of thin adjustment washers that allow clutch engagement tuning.
  • Page 50 • The best way to prevent glazing is by not gearing too high, changing the oil as specified and by not blipping the throttle. Every time you blip the throttle, you are working your clutch springs. CAUTION: The clutch produces a tremendous amount of heat and when a rider is blipping the throttle.
  • Page 51 1. After cleaning or replacing the spring washers, reassemble the stack up of washers. CAUTION: It is important to reassemble the washer stack to that which is recommended or to your own specialized stack. CAUTION: It is also important that all three shoes are stacked the same. (See figure 32) 2.

  • Page 52: 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 # MCMUGF01). Ignition Stator care Stator failure will result from running the bike hot.
  • Page 53 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 54: Cooling System

    The air stream running through the radiator cools the radiator fluid. Therefore dirty radiators additionally reduce the cooling effect. Cobra has tested numerous brand name automotive and racing coolant / antifreeze solutions and has found Liquid Performance Propylene Glycol based Mini Coolant or Antifreeze to have the greatest effect on reducing cylinder head temperatures.
  • Page 55 • 3/8” diameter x 8” long steel rod • Hammer COBRA IMPELLER SERVICE INSTRUCTIONS 1. Remove exhaust pipe and gas tank (you may be using a propane torch in step 2. Remove radiator cap and drain engine coolant by removing the 13mm- hex head coolant drain plug.
  • Page 56 Figure 39 CAUTION: Too much heat can be detrimental to the engine cases. 13. The shaft assembly is serviceable. Use a 4mm hex key to remove impeller retainer screw. Remove impeller, seal and both bearings. Check shaft for wear in the area of the seal.
  • Page 57 16. Re-assemble in reverse order of disassembly. CAUTION: Clean all threads and use blue (medium strength) thread locker on the belt retainer screw. NOTE: Apply Ultra black Hi-Temp RTV silicon or Teflon pipe sealant to the tapered pipe threads of the coolant fitting before assembly. NOTE: Refill the coolant system with Liquid Performance Propylene Glycol based Mini Coolant / Antifreeze.

  • Page 58: Fuel & Air System

    RCMU0269 VELOCITY STACK Figure 42 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 59 adjustment. To lower the idle, turn the screw counter-clockwise. TOP END JETTING: Indications that the engine is running too rich (too much fuel for the air) are: • Engine not revving out or blubbering at high RPMs. • Engine will not ‘clean out’ •...
  • Page 60 Clean the carburetor in a well-ventilated area, and take care that there is no spark or flame anywhere near the working area; this includes any appliance with a pilot light. Because of the danger of highly flammable liquids, do not use gasoline or low flash-point solvent to clean the carburetor.

  • Page 61: Exhaust

    Reeds: • The reeds must lay flat on the reed cage. • If the reed tips aren’t lying flat, replace them immediately. • The reeds must have a tight seal on the reed cage. • If the reed is damaged in any way, replace it. This means cracks, chips, and ruptures.

  • Page 62: Wheels & Tires

    Wheels & Tires Rear wheel pullers Disassembly: 1. Remove axle, back wheel assembly. 2. Pull the rear wheel pullers out of the back of the swing arm. Figure 45 Rear wheel alignment: By eye, ensure that the rear sprocket is running true (in-line, planar) with the front sprocket.

  • Page 63: Front Forks

    Front Forks Tools recommended for front fork service: • Flat head screwdriver • Hammer • Pick • Seal driver MCMUTL02 • 9/16” (loose 14 mm) wrench • 25mm wrench or socket • 7 wt fork oil FORK DISASSEMBLY PROCEDURES: 1. Using the 25mm wrench, remove the fork cap. 2.
  • Page 64 The damper rod is hollow and will break if the nut is over tightened (proper torque is 12 ft-lb, 16 Nm). Because of different rider weights, sizes and riding styles, we offer various suspension options: See Optional Components section of this manual for details on these and other optional components for your Cobra Motorcycle.

  • Page 65: Rear Shock

    Rear Shock The rear shock is fully serviceable but it is recommended that only trained professionals should service your shock. Contact Cobra or PR2 for questions and service of your King shock. Shock preload Figure 47 Shock Damping Figure 48...

  • Page 66: Tuning

    Tuning 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 • Not enough top end speed • No snap • Over heat clutch •...
  • Page 67 Sprocket Gear Ratio 2.20 2.27 2.33 2.36 2.40 2.43 2.47 2.50 2.53 2.54 2.57 2.60 2.62 2.64 2.67 2.69 stock 2.71 2.73 2.77 2.79 2.80 2.85 2.86 2.92 2.93 3.00 3.00 3.08 3.15 3.23 Ratio Write © Cobra R&D 2004...

  • Page 68: Suspension

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

  • Page 69: Carburetion

    Lower the bike if the rider has difficulties touching the ground. 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 current weather...
  • Page 70 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...
  • Page 71 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 72: 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 73: Index

    ii) Is sour or bad 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...
  • Page 74 Hardware Swingarm ........39 Frame ..........31 Top End .........27 Plastic..........35 Triple Clamps ........29 Plastic & Seat Parts ......35 Ignition Pullers ..........60 Parts ..........26 Service ...........51 Rear Brake Timing ..........52 Adjustment........13 Parts ..........36 Jetting Rear Wheel How To ...........57 Parts ..........37 Stock..........5 Pullers ..........60 Troubleshooting ......67 Reeds ..........59...

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