Cobra CX50-OI 2007 Manual
  1. Manuals
  2. Brands
  3. Cobra Manuals
  4. Motorcycle
  5. CX50-OI 2007
  6. Manual

Cobra CX50-OI 2007 Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
2007 CX50-OI
Owners
Parts
Service
Tuning

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the CX50-OI 2007 and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Cobra CX50-OI 2007

Summary of Contents for Cobra CX50-OI 2007

  • Page 1 2007 CX50-OI 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 (517) 437-9100 If you need technical assistance contact your local dealer or call the Cobra Technical Support Hotline at (517) 437-9100 Cobra Motorcycle MFG., Inc.
  • Page 3 “WARNING” THE COBRA CX50 OI 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 Specifications - General ..................5 Specifications - Torque Values................6 Optional Components..................7 Break-In Procedure ...................8 Starting Procedure ....................9 General Tips....................10 Maintenance .......................10 Schedule & Tips ....................10 Replacing Transmission / Clutch Lubricant .............11 Chain adjustment ....................13 Front brake adjustment ...................13 Rear brake adjustment ..................14 Air Filter Cleaning....................15 Fork Oil Replacement..................16...
  • Page 5 Parts – Forks and Triple Clamps ..............30 Parts – Frame – Mounting Hardware I ............32 Parts – Front Brakes ..................35 Parts – Front Wheel ..................36 Parts – Oil Reservoir ..................37 Parts – Plastic Bodywork & Seat ..............38 Parts – Rear Brake..................39 Parts –...

  • Page 6: General Information

    Slow (Pilot) jet 42 Float height Non adjustable Coolant 50/50 antifreeze-coolant / distilled water Transmission Speed Single Clutch 3 shoe centrifugal Final drive ratio 10/44 T Transmission / clutch oil type Cobra Venom 3 Shoe Clutch Milk Quantity 250 ml (8.5oz)

  • Page 7: Specifications - Torque Values

    Chassis Front tire 2.50 – 10 Pressure 20 psi minimum Rear tire 2.50 – 10 Pressure 20 psi minimum Front fork Marzocchi 32mm Fork oil type SAE 20 weight Fork oil amount 200 ml (6.8 oz) oil change, 220 ml (7.4 oz) rebuild Fork oil height 70 mm (2.75”) collapsed from top with spring (no spacer) Specifications - Torque Values...

  • Page 8: Optional Components

    Optional Components Call your dealer, or the factory, for details • Carburetor jets o Main jets #’s 74, 76, 78, 80, 84, 86, 88, 90, 92, 94 o Slow jets #’s 38, 40, 42, 45, • Exhaust Power Regulator, ECPW0001 •...

  • Page 9: Break-In Procedure

    Break-In Procedure Your Cobra CX50 OI is a close-tolerance high performance machine and break- in time is very important for maximum life and performance. The CX50 OI can be ridden hard after the first ½ hour break-in time but it is recommended that no adjustments are made to the suspension until the full 8 hours of bike break-in has elapsed.

  • Page 10: 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 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: Replacing Transmission / Clutch Lubricant

    Use ER70S6 filler if welding on the frame. Replacing Transmission / Clutch Lubricant Tools needed: • 250 ml (8.5oz) Cobra Venom 3 Shoe Clutch Milk (Part # MCMUGF01) • #3 Phillips screwdriver • large flat blade screwdriver or coin Procedure: 1.
  • Page 13 4. After it has drained, reinstall the drain screw with gasket. 5. Refill oil from oil fill plug 250 ml (8.5oz) Cobra Venom 3 Shoe Clutch Milk (Part # MCMUGF01) thru the fill plug. NOTE: Leaning the bike over onto it’s left hand side will facilitate the oil filling procedure.

  • Page 14: Chain Adjustment

    Chain adjustment Tools required for chain adjustment • 19 mm wrench or socket • 13 mm wrench or socket 1. Make sure that the rear wheel aligned properly. For proper adjustment, the chain should have 35 3/8”) free movement just behind the chain block with no load on the bike (figure Figure 2...

  • Page 15: Rear Brake Adjustment

    Figure 4, from the brake lever Figure 5, from the brake hub From the brake lever: 1. Slide the cover out of the way 2. Loosen the locking nut on the brake lever. 3. Adjust the bolt to desirable position. 4.

  • Page 16: Air Filter Cleaning

    7. Saturate with filter oil and remove excess. NOTE: The Cobra is equipped with a special designed Air box. It is very important to keep the air filter clean and properly oiled with high quality water-resistant foam filter oil. It’s very important to oil your filter consistently each time because varied amounts of oil will change your carburetor jetting.

  • Page 17: Fork Oil Replacement

    Figure 8 NOTE: Make sure you change or clean your filter after each moto. We recommend carrying multiple filters in your toolbox, one for each practice session and moto. Fork Oil Replacement Tools required • 5 & 6 mm Allen wrench •...

  • Page 18: Exhaust Power Regulator

    4. Install and depress the white cap while installing the spring clip. 5. Fork may be reinstalled. Exhaust Power Regulator As an entry level race machine, the Cobra CX50 OI comes with an optional Exhaust Power Regulator (EPR) (figure 9b) that when installed, between the exhaust pipe and cylinder flange, will cut the peak rear wheel power by ½.

  • Page 19: Parts

    Parts Parts – Airbox and Inlet System I FIGURE 10 Airbox and Inlet System REF # PART # DESCRIPTION RCMU0404 AIR BOX – CX50 OI RCMU0408 MUD FLAP – CX50 OI RCMU1407 BRACKET – MUD FLAP HCBB0612 M6X12 BUTTON HEAD BOLT (2 REQ’D) RCMU0403 AIR FILTER WITH BOOT ECMPIN01...
  • Page 20 Parts – Airbox and Inlet System II Figure 11 REF NO PART NO DESCRIPTION ECMPIN01 12MM CARBURETOR Not Shown FCMU0026 FUEL LINE, 5” Not Shown MCMUCL04 HOSE CLAMPS – FUEL LINE ECMOIN02 CLAMP HCBC0625 6X25 CAP SCREW ECMOIN04 REED SPACER PLATE ZCMOIN05 REED VALVE GASKET ECMOIN06 REED VALVE ASSEMBLY NOT SHOWN ECMOIN07 REED PEDALS...

  • Page 21: Parts - Bars And Controls

    Parts – Bars and Controls Figure 12 Bars and Controls REF # PART # DESCRIPTION FCPW0001 THROTTLE ASSEMBLY TCMU0008 GRIPS (SET OF TWO) FCPW0002 THROTTLE CABLE FCMU0033 KILL SWITCH ASSEMBLY KCMZ0001 M8X50 SOCKET HEAD CAP SCREW (4 REQ’D) KCMZ0003 LOWER HANDLE BAR CLAMP (2 REQ’D) KCMZ0002 TOP HANDLE BAR CLAMP (2 REQ’D) TCMU0019...

  • Page 22: Parts - Carburetor

    Parts – Carburetor PART # DESCRIPTION RCOI0001 SLIDE – 40 – STOCK RCOI0030 SLIDE – 30 RCOI0050 SLIDE – 50 RCOI0002 NEEDLE FOR SLIDE RCOI0003 ATOMIZER RCOI0004 MAIN JET-82 STOCK RCOI00## ADDITIONAL MAIN JETS, 74 – 94 EXAMPLE RCOI0094 FOR 94 MAIN RCOI0005 PILOT JET-42 STOCK RCOI00##...

  • Page 23: Parts - Coolant System

    Parts – Coolant System Figure 14 Coolant System REF # PART # DESCRIPTION ECMU0061 RADIATOR WITH CAP ECPW0002 RADIATOR HOSE LEFT MCMUCL07 HOSE CLAMP STANDARD (three places) ECHA0003 MOUNTING BRACKET – RADIATOR BOTTOM HCBC0607 M6X50 SOCKET HEAD CAP SCREW HCNL0601 6MM LOCK NUT MCKGGR00 GROMMET –...

  • Page 24: Parts - Electrical System

    Parts – Electrical System Figure 15 Electrical System REF # PART # DESCRIPTION ECMOIG06 CDI UNIT HCBF0616 M6X16 FLANGE HEAD BOLT ECMOIG01 STATOR & FLYWHEEL HCBC0401 M4X18 SOCKET HEAD CAP SCREW ECMOIG16 SPACER – FLYWHEEL HCWF0801 8MM FLAT WASHER HCNS0801 8MM NUT FCMU0033 IGNITION CUT-OFF SWITCH ASSEMBLY...

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

    Parts – Engine – Bottom End & Transmission Figure 16 REF NO PART NO DESCRIPTION ECMOBE01 CASES – COMPLETE SET ECMOBE02 OUTPUT BEARING ECMOBE03 OUTPUT BEARING – SNAP RING ECMOBE04 PRECISION BEARING ECMOBE05 CRANK SEAL ECMU0016 CRANK BEARING ECMOBE07 CRANKSHAFT COMPLETE ECMOBE08 FLYWHEEL KEY ECMU0077 WRIST PIN BEARING HCBC0660 6X60 CAP SCREW...
  • Page 26 Parts – Engine – Clutch Figure 17 Clutch components REF NO PART NO DESCRIPTION ECMOCL01 GEAR – DRIVE ECMOCL03 CLUTCH START NUT – LH THREAD ECMOCL04 WASHER – CLUTCH NUT BACK UP ECMOCL30 CLUTCH COMPLETE ECMOCL06 SPACER – CLUTCH TO HUB ECMOCL07 BUSHING –...
  • Page 27 Parts – Engine – Ignition Side Figure 18 REF NO PART NO DESCRIPTION ECMOWP01 WATER PUMP SHAFT ECMOWP02 RETAINER CLIP – WATER PUMP BEARING ECMOWP03 BEARING WATER PUMP ECMOWP04 SPACER – WATER PUMP BEARING ECMOWP05 CRANK PULLEY ECMOWP06 WATER PUMP BELT ECMPWP07 CLAMP FOR OIL TUBE HCBC0501 5X12 CAP SCREW...
  • Page 28 Parts – Engine – Kick Starter Figure 19 REF NO PART NO DESCRIPTION ECMOKS01 CLUTCH COVER ECMOKS02 CRUSH WASHER – WATER DRAIN PLUG ECMOKS03 WATER DRAIN PLUG – 6X8 ZCMU0001 OIL FILL PLUG GASKET ECMU0037 OIL FILL PLUG ECMOKS06 RETAINER CLIP – THRUST WASHER HCBC0625 6X25 CAP SCREW ECMPKS09 KICK START LEVER HCBC0603 6X30 CAP SCREW...
  • Page 29 Parts – Engine – Top End Figure 20 REF NO PART NO DESCRIPTION ECMOTE01 CYLINDER - CHROME ECMOTE02 PISTON KIT - SINGLE RING HCBC0603 6X30 CAP SCREW HCNF0601 FLANGED NUT 6MM ECMOTE05 CYLINDER HEAD ZCMOTE06 CYLINDER HEAD O-RING ECMU0026 6MM DOWEL ECMOTE09 CYLINDER HEAD STUD BOLT 6MM ZCMOTE10...

  • Page 30: Parts - Exhaust System

    Parts – Exhaust System Figure 21 Exhaust System REF # PART # DESCRIPTION XCPW2004 CX50 OI EXHAUST PIPE ZCMOTE11 O-RING – EXHAUST (2 REQ’D) XCMU0005 SPRING – EXHAUST SHORT XCMU0028 PIPE / SILENCER SEAL MCMUGR03 MOUNTING GROMMET (2 REQ’D) TCKG0001 SPACER HCBF0625 M6X25 FLANGE HEAD BOLT...

  • Page 31: Parts - Forks And Triple Clamps

    Parts – Forks and Triple Clamps Figure 22 Front Forks and Triple Clamp REF # PART # DESCRIPTION KCMZ0029 OUTER FORK LEG – RIGHT (NON BRAKE) SIDE KCMZ0031 OUTER FORK LEG ASSY – RIGHT WITH SEAL & SWIPER NOT SHOWN KAPW005R FORK LEG COMPLETE –...
  • Page 32 Parts – Forks – Assembly Figure 23 REF # PART # DESCRIPTION KCMZ0004 FORK PLUG – BLACK KCMZ0007 SNAP RING FOR FORK CAP KCMZ0008 INNER FORK CAP - WHITE KCMZ0009 O-RING UNDER FORK CAP KCMZ0011 PRELOAD SLEEVE KCMZ0012 FORK SPRING KCMZ0013 SWIPER KCMZ0014...

  • Page 33: Parts - Frame - Mounting Hardware I

    Parts – Frame – Mounting Hardware I Figure 24 Frame – Engine, Tank, and Pipe Mounts, Brake Snake REF # PART # DESCRIPTION FAMU0004 FRAME 2004 CM50 HCBH1403 SWINGARM BOLT HCNL1402 SWINGARM LOCK NUT (M14X1) HCBH0880 M8X80 SOCKET HEAD CAP SCREW HCNL0801 8MM LOCKNUT MCMUGR06...
  • Page 34 Parts – Frame – Mounting Hardware II Figure 25 Frame – Seat, Fender, Right Side Panel, Brake Pedal, Silencer & Shock Mounts REF # PART # DESCRIPTION FAMU0004 FRAME 2004 CM50 HCBB0635 M6X35 BUTTON HEAD CAP SCREW HCHA0003 6MM CLIPNUT HCBF0620 M6X20 FLANGE HEAD BOLT HCNF0602...
  • Page 35 Parts - Frame – Mounting Hardware III Figure 26 Frame – Radiator, Footpeg, Chain Roller, and Airbox Mounts REF # PART # DESCRIPTION FAMU0004 FRAME 2004 CM50 ECHA0003 MOUNTING BRACKET – RADIATOR BOTTOM HCBC0607 M6X50 SOCKET HEAD CAP SCREW HCNL0601 6MM LOCK NUT MCKGGR00 GROMMET –...

  • Page 36: Parts - Front Brakes

    Parts – Front Brakes Figure 27 Front Brakes REF # PART # DESCRIPTION WCPW0103 BRAKE HUB – FRONT BCMU0113 BRAKE ARM – FRONT BCMU0005 CABLE CLAMP, WASHER & NUT BCMU0006 CABLE ADJUSTOR BCMU0110 BRAKE SHOE (PAIR) BCMU0010 SPRING – BRAKE RETURN BCMU0011 PUSH NUT –...

  • Page 37: Parts - Front Wheel

    Parts – Front Wheel Figure 28 Front Wheel REF # PART # DESCRIPTION WAPW0001 FRONT WHEEL COMPLETE WCPW0001 RIM WITH BEARINGS SHOWN WCMU0018 FRONT TIRE WCMUTU10 TUBE 10” WCMU0014 FRONT AXLE HCWF1202 WASHER – AXLE WCPW0005 FRONT WHEEL SPACER WCMU0020 BEARING –...

  • Page 38: Parts - Oil Reservoir

    Parts – Oil Reservoir Figure 29 Oil Reservoir REF # PART # DESCRIPTION TCPW0101 OIL RESERVOIR WITH FITTING TCPW0005 FITTING – OIL RESERVOIR MCMUCL06 CLAMP - HOSE TCPW0002 CAP – OIL RESERVOIR TCPW0004 HOSE – OIL INJECTION ZCPW0001 O’RING – FITTING SEAL...

  • Page 39: Parts - Plastic Bodywork & Seat

    Parts – Plastic Bodywork & Seat Figure 30 Plastic and Seat REF # PART # DESCRIPTION NOT SHOWN TCMU2007 GRAPHIC KIT TCHA0107 FRONT FENDER NOT SHOWN HCBF0616 FENDER BOLT, M6X16 FLANGE HEAD (4 REQ’D) TCMU0005 NUMBER PLATE - FRONT NOT SHOWN HCBF0635 M6X35 FLANGE HEAD BOLT –...

  • Page 40: Parts - Rear Brake

    Parts – Rear Brake Figure 31 Rear Brake System REF # PART # DESCRIPTION BAMU0000 BRAKE PEDAL BCMU0008 CABLE – BRAKE SNAKE BCMU0009 CRIMP – BRAKE SNAKE HCBB0803 M8X40 BUTTON HEAD SCREW HCNL0801 8MM LOCK NUT HCBH0602 M6X25 HEX HEAD BOLT (BRAKE STOP ADJUST) HCNS0601 6MM NUT BCCM0105...

  • Page 41: Parts - Rear Wheel

    Parts – Rear Wheel Figure 32 Rear Wheel REF # PART # DESCRIPTION WAPW0002 WHEEL COMPLETE – REAR WCPW0002 RIM WITH BEARINGS SHOWN WCMU0018 TIRE – REAR WCMUTU10 TUBE – 10” PCMU0100 CHAIN –100 LINKS 420 PCMU0001 MASTER LINK – 420 CHAIN WCMU0016 REAR AXLE HCPA0002...

  • Page 42: Parts - Shock

    Parts – Shock Figure 33 REAR SHOCK REF# PART # DESCRIPTION SAPW2007 SHOCK ABSORBER SCMUOH05 SPRING – STANDARD (285 lb/in) yellow SCMUOH04 SPRING – LIGHT (275 lb/in) red SCMUOH06 SPRING – HEAVY (295 lb/in) white HCBF1040 M10X40 FLANGE HEAD BOLT...

  • Page 43: Parts - Swingarm Assembly

    Parts – Swingarm Assembly Figure 34 Swingarm REF # PART # DESCRIPTION GACM2004 SWINGARM ASSEMBLY (CONTAINS ITEMS 1 - 13) GAMU0004 SWINGARM GCMU0001 SWINGARM BUSHING (SINGLE PIECE) GCMU0009 SPACER - PIVOT TUBE GCMU0017 CHAIN GUARD HCFH0516 M5X16 FLAT HEAD SCREW HCWF0501 5MM FLAT WASHER HCNL0501...

  • Page 44: Service

    Engine Factory trained technicians with precision gauging and proper assembly fixtures carefully assemble all Cobra engines to specific clearances. If you feel you have the skills, and the appropriate tools, to perform the following service tasks please follow the instructions closely. The part numbers are listed throughout to help you when ordering parts from your local Cobra dealer.

  • Page 45: Reeds

    It is easy to prematurely damage the clutch and other engine components with improper clutch adjustment. If you are unsure of how to adjust the clutch, by even the slightest, contact the Cobra Technical Support Group before making adjustments. Clutch shoe wear: •...
  • Page 46 Figure 35 The presence of light indicates that the reeds should be replaced, or possibly turned over.

  • Page 47: Carburetor

    Carburetor REF F PART # PART # DESCRIPTION DESCRIPTION RCOI0001 SLIDE - 40 - STOCK RCOI0030 SLIDE - 30 RCOI0050 SLIDE - 50 RCOI0002 NEEDLE FOR SLIDE RCOI0003 ATOMIZER RCOI0004 MAIN JET-82 STOCK RCOI00## ADDITIONAL MAIN JETS, 74 - 94 EXAMPLE RCOI0094 FOR 94 MAIN RCOI0005 PILOT JET-42 STOCK...
  • Page 48 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 49 screw. This screw will also richen and lean your engine more on the bottom and mid-range. In warmer conditions, turn the screw in. In colder conditions, turn the screw out. Be sure to keep the carburetor very clean and make sure you don't have water or dirt in the carburetor bowl.

  • Page 50: Exhaust

    Exhaust The pipe is a crucial element to a motorcycle. Any kinks, dents, or damage done to the pipe will result in a major performance loss. NOTE: Be sure to take the pipe off, and any carbon that may be built up. Carbon build up is created from exhaust.

  • Page 51: Tuning

    Tuning 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 52 Lower the bike if the rider has difficulties touching the ground. Rear shock The rear shock on your Cobra is adjustable to your riders weight and riding style by changing the spring rate (stiffness) of the spring and / or by changing the damping valves.
  • Page 53 Figure 40 Front Forks Cobra offers stiffer and softer fork springs depending on the weight of your rider. See the Parts Shock section or the Optional component section at the beginning of the manual for these other components. The front forks are designed with the damping components in separate fork legs.

  • Page 54: 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 • Not enough top end speed • No snap • Over heat clutch • Premature failure of engine seals, bearings, & electronics •...

  • Page 55: Carburetion

    Ratio Write © Cobra R&D 2004 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 56 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 59 shows its range of adjustment and in particular what adjustable component affects what...
  • Page 57 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 58: Troubleshooting

    Troubleshooting 1) Engine not behaving properly a) Carburetor top is installed backwards (happens a lot) b) The carburetor slide indexing pin is missing c) Wrong spark plug installed (8339 Champion to be used on ’04 or later & no mods) d) Needle clip is on top of plastic not below e) Air leak –...
  • Page 59 Spark plug fouled ii) Wrong spark plug installed (8339 Champion to be used on ’04 or later & no mods) iii) Spark plug cap off iv) Engine Shut-off ‘kill’ switch is shorted v) Bad electrical ground vi) Stator winding damaged d) Exhaust is plugged 6) Overheating a) Bad stator...
  • Page 60 Petcock ........9 Shock.........41 Gearing ......... 53 Swingarm........42 General Tips ......... 10 Top end ........28 Hardware Parts List Plastic........38 Front Forks ........52 Ignition .......... 23 Petcock ...........9 Jetting Plastic & Seat Parts.......38 How To........47 Pullers ...........49 Stock ........... 5 Rear Brake Troubleshooting......

Table of Contents