CARB OVERHAUL

Purpose of each component.

General info.

The fuel tap has 3 positions.

  1. "RES" means the carbs get access to all petrol in the tank including reserve.
  2. "OFF" means that no petrol gets thru the tap, switch off tap before
    diconnecting hose.
  3. "ON" means the carbs get access to the first 10 liters in the tank but
    not the last two liters.

Carb removal

Disassembly

Inspection

Assembly.

Carb installation.

Pilot screw adjustment (only if you wish to re-tune)
Idle drop procedure (USA only).


Note:



  1. Turn each piolt screw clockwise until it seats lightly and
    back it out to the specification in the table above.
    This is an initial setting prior to the final pilot screw adjustment.
    Caution
    Damage to the pilot screw seat will occur if the pilot screw is
    tightened against the seat.
  2. Warm up the engine to operating temperature.
    Stop and go riding for 10 minutes is sufficient.
  3. Attach a tachometer according to the manufacturer's
    instructions.
  4. Adjust the idle speed with the throttle stop screw.
  5. Turn each pilot screw 1/2 turn out from the initial setting.
  6. If the engine speed increases by 50 rpm or more, turn
    each pilot out by an additional 1/2 turn until engine
    speed drops by 50 rpm or less.
  7. Adjust the idle speed with the throttle stop screw.
  8. Turn the rear cylinder carburetor pilot screw in until the
    engine speed drops by 50 rpm.
  9. Turn the rear cylinder carburetor pilot screw 1 turn out
    from the position obtained in step 8.
  10. Adjust the idle speed with the throttle stop screw.
  11. Perform, steps 8, 9 and 10 for the front cylinder carburetor
    pilot screw.

Carburettor synchonization (balancing).

  1. Ensure that air box and filter are in place before synchronizing.
  2. fully warm up engine to operating temperture.
  3. Swith off engine and remove both intake manifold screws with their
    sealing washers.
  4. Attach a vacuum gauge to each port (M5 thread).
  5. Start engine and adjust idle speed to 1,200 rpm.
  6. Use the adjusters to stabilize the reading on vac gauges,
    allow a small amount of fluctuation on the reading.
  7. By putting a screw driver into the hole in the center of the air box
    turn the carb synchronization screw so that the vacuum reading is the
    same on each gauge.
  8. Tolerable vacuum difference is 40 mmHg or less.