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Cobra · Two-stroke single, premix, chain drive

CX65

Library entry covers 2009-2025

17 factory 51 guideline

Published source

Cobra CX65 Owner's Manual 2021, Maintenance schedule pp.11-12 (cobramoto.com MCC62021cx65.pdf)

Factory owner's handbook. Covers Cobra CX65 owner's manual, 2021 edition (refers to 2015-on engine cases); earlier editions not compared.

68 items for a 2020 model, grouped by interval the way a factory chart is laid out.

How this bike is built (what the schedule is based on)
Engine cycle
Two-stroke
Engine lubrication
Two-stroke premix (oil in fuel)
Oil filtration
None (no filter)
Valve gear
None (two-stroke porting)
Ignition
Electronic (CDI / transistor / ECU)
Charging
Alternator / stator with rectifier
Battery
Wet cell (flooded lead-acid, needs topping up)
Fuel system
Single carburetor
Cooling
Liquid cooled
Primary drive
Gear or chain inside engine, shares engine oil
Gearbox oil
Separate gearbox oil
Clutch control
Hand lever, hydraulic
Final drive
Chain
Front suspension
Telescopic fork
Rear suspension
Swingarm, twin shocks
Front brake
Disc, hydraulic
Rear brake
Disc, hydraulic
Wheels
Spoked, tubed
Sidecar
No sidecar
Maintenance schedule

2020 Cobra CX65

On the road: every 150 mi

1 item
  • Check two-stroke oil tank / carry premix oil
    Pre-ride / on the road
    Guideline

    Running a two-stroke out of oil seizes it. Injection bikes: check the tank. Premix: carry oil and a measure.

On the road: every 300 mi

3 items
  • Check lights, horn, brake light switches
    Pre-ride / on the road
    Guideline
  • Check tire pressures
    Pre-ride / on the road
    Guideline
  • Lubricate drive chain
    Pre-ride / on the road
    Guideline

    Lube warm, ideally at the end of the riding day so it soaks in overnight. Sooner after rain.

On the road: every 500 mi

1 item
  • Check coolant level
    Pre-ride / on the road
    Guideline

On the road: every 600 mi

1 item
  • Check chain slack and rear wheel alignment
    Pre-ride / on the road
    Guideline

Every 1,000 mi or 6 months

1 item
  • Inspect tire tread, sidewalls and date codes
    Wheels and tires
    Guideline

Every 2,000 mi or 12 months

1 item
  • Replace spark plugs (two-stroke)
    Engine
    Guideline

Every 3,000 mi or 12 months

11 items
  • Check throttle cable(s) free play and return
    Fuel and air
    Guideline
  • Clean fuel tap filter / sediment bowl
    Fuel and air
    Guideline
  • Clean drive chain thoroughly (remove and soak, re-lube)
    Final drive
    Guideline

    Non O-ring chains on old machines: remove, clean, soak in hot chain grease or lube, refit with the master link clip closed end leading.

  • Inspect chain and sprockets for wear (measure stretch)
    Final drive
    Guideline
  • Check steering head bearing adjustment
    Front end
    Guideline
  • Inspect fork seals, stanchions and fork boots
    Front end
    Guideline
  • Check footrests, pegs, rear brake and gear lever pivots
    Rear suspension and frame
    Guideline
  • Grease and check center / side stand and springs
    Rear suspension and frame
    Guideline
  • Check brake pads and discs
    Brakes
    Guideline
  • Check spoke tension and wheel true
    Wheels and tires
    Guideline
  • Check wheel bearings for play
    Wheels and tires
    Guideline

Every 3,000 mi or 2 years

1 item
  • Decarbonize exhaust ports, pipes and baffles
    Engine
    Guideline

    Two-strokes coke up the exhaust port and muffler baffles; power falls off gradually.

Every 4,000 mi or 12 months

1 item
  • Inspect, clean and gap spark plugs
    Engine
    Guideline

Every 6,000 mi or 12 months

8 items
  • Inspect coolant hoses and clamps
    Engine
    Guideline
  • Clean / inspect air filter
    Fuel and air
    Guideline

    Mesh or oiled foam: clean and re-oil. Paper: blow out or replace. Some very early machines have no filter at all.

  • Clean carburetor float bowl(s), check float level and jets
    Fuel and air
    Guideline

    Ethanol fuel varnishes old carbs quickly in storage.

  • Check charging voltage and regulator / cut-out
    Ignition and electrics
    Guideline
  • Check swingarm bushes for play
    Rear suspension and frame
    Guideline
  • Inspect rear shocks for leaks and damping
    Rear suspension and frame
    Guideline
  • Lubricate control cables and lever pivots
    Controls and cables
    Guideline
  • Lubricate speedometer / tachometer cables, check drive
    Controls and cables
    Guideline

    A dry speedo cable whips the needle and eventually kills the instrument.

Every 10,000 mi or 2 years

2 items
  • Compression test (or leak-down)
    Engine
    Guideline
  • Change gearbox oil
    Primary and gearbox
    Guideline

Every 12,000 mi or 2 years

2 items
  • Replace air filter element
    Fuel and air
    Guideline
  • Grease swingarm pivot
    Rear suspension and frame
    Guideline

Every 15,000 mi or 3 years

1 item
  • Change fork oil
    Front end
    Guideline

    Some early telescopic forks are grease filled or use very small oil quantities. Check your manual.

Every 16,000 mi or 4 years

1 item
  • Replace spark plugs
    Engine
    Guideline

Every 18,000 mi

1 item
  • Replace chain and sprockets (wear based)
    Final drive
    Guideline

Every 20,000 mi or 4 years

2 items
  • Repack / replace steering head bearings
    Front end
    Guideline

    Many old machines use loose balls in cups and cones. Taper roller conversions are common.

  • Repack / replace wheel bearings
    Wheels and tires
    Guideline

    Cup-and-cone and taper roller hubs need periodic repacking and adjustment.

Every 25,000 mi or 6 years

1 item
  • Replace swingarm bushes / bearings
    Rear suspension and frame
    Guideline

Every 30,000 mi or 6 years

1 item
  • Rebuild forks: seals, bushes, springs
    Front end
    Guideline

Every 2 h

2 items
  • Transmission oil (replace)
    Primary and gearbox
    Factory

    Factory: Maintenance schedule (p.11-12): every 2 hours of operation; Spectro Golden SAE 80 gear lube, 18 oz.

  • Spoke tension (check)
    Wheels and tires
    Factory

    Factory: Maintenance schedule (p.11-12): every 2 hours of operation.

Every 10 h

2 items
  • Fork oil (replace)
    Front end
    Factory

    Factory: Maintenance schedule (p.11-12): every 10 hours of operation; 5 wt Spectro fork oil (p.17).

  • Shock oil (replace)
    Rear suspension and frame
    Factory

    Factory: Maintenance schedule (p.11-12): every 10 hours of operation, by a certified Cobra mechanic.

Every 15 h

3 items
  • Piston rings (replace)
    Engine
    Factory

    Factory: Maintenance schedule (p.11-12): every 15 hours; inspect the piston for wear and cracks.

  • Power valve (clean)
    Engine
    Factory

    Factory: Maintenance schedule (p.11-12): every 15 hours; no adjustment necessary.

  • Power valve cable (inspect)
    Controls and cables
    Factory

    Factory: Maintenance schedule (p.11-12): every 15 hours.

Every 6 months

1 item
  • Clean battery terminals, check charge and strap
    Ignition and electrics
    Guideline

Every 2 years

5 items
  • Replace coolant
    Engine
    Guideline
  • Inspect wiring, bullet connectors and ground points
    Ignition and electrics
    Guideline
  • Replace hydraulic clutch fluid
    Primary and gearbox
    Guideline
  • Inspect frame, welds and lugs for cracks
    Rear suspension and frame
    Guideline
  • Replace brake fluid
    Brakes
    Guideline

Every 4 years

3 items
  • Replace fuel lines
    Fuel and air
    Guideline

    Old rubber and modern ethanol fuel do not mix well.

  • Inspect brake hoses; replace old rubber
    Brakes
    Guideline
  • Rebuild calipers and master cylinders (seals)
    Brakes
    Guideline

Every 6 years

2 items
  • Replace inner tubes and rim tape with tires
    Wheels and tires
    Guideline
  • Replace tires on age (regardless of tread)
    Wheels and tires
    Guideline

No interval set

10 items
  • Nuts and bolts (check torque)
    Engine
    Factory

    Factory: Maintenance schedule (p.11-12): prior to each ride, check all nuts and bolts and re-torque if necessary.

  • Air filter (check, clean, re-oil)
    Fuel and air
    Factory

    Factory: Maintenance schedule (p.11-12): prior to each ride, check the air filter; clean and re-oil as necessary.

  • Ignition stator and rotor (check)
    Ignition and electrics
    Factory

    Factory: Maintenance schedule (p.11-12): prior to each ride, make sure they are clean and dry.

  • Drive chain (check tension, lubricate)
    Final drive
    Factory

    Factory: Maintenance schedule (p.11-12): prior to each ride, check tension and lubrication; adjust and lubricate as necessary.

  • Fork air pressure (bleed)
    Front end
    Factory

    Factory: Maintenance schedule (p.11-12): prior to each ride, equalize the pressure in the forks with atmosphere (fork chart p.17: bleed excess air each ride).

  • Frame (check for cracks)
    Rear suspension and frame
    Factory

    Factory: Maintenance schedule (p.11-12): prior to each ride, check for cracks in the metal or paint that may show the frame has been overstressed.

  • Brakes (check)
    Brakes
    Factory

    Factory: Maintenance schedule (p.11-12): prior to each ride, check brake operation and pad thickness.

  • Spokes, rims and hubs (check)
    Wheels and tires
    Factory

    Factory: Maintenance schedule (p.11-12): prior to each ride, check spoke tightness and look for cracks around rims, spokes and hubs.

  • Tire pressure (check)
    Wheels and tires
    Factory

    Factory: Maintenance schedule (p.11-12): prior to each ride, check and adjust tire pressures.

  • Throttle cable (check)
    Controls and cables
    Factory

    Factory: Maintenance schedule (p.11-12): prior to each ride, make sure the throttle snaps shut; check for frayed strands inside the throttle housing and replace if necessary.

Guideline lines: Intervals here are general guidelines for the machine's era and layout, compiled for this app. They are not factory manual figures. Check your workshop manual, and edit any interval in the bike's Schedule tab.

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Other 2020 Cobra models

All 2020 Cobra
2009-2025
CX50
Factory