THE FINAL FINE TUNE-UP

Upon return from the above ‘warm-up’ drive, keep the engine running and proceed as follows:

1) Check and reset the Dwell/Ign Timing/Idle rpm to the recommended values, as required, making sure that the Ign timing is reset only after ensuring that the idle rpm is not > 900, preceded by ‘Dwell’ correction. For the latter, obviously the engine will have to be switched off.

2) With the three parameters thus in place, open or close the Carb mixture screw slowly to get the highest idle rpm. Sometimes this may go even beyond 1000, depending upon its initial position. Say, it peaks at 1000rpm;

3) Reduce the same by throttle control screw to 900rpm. Again +/- the mixture screw to the peak idle rpm position. This time, say it’s 950.

4) Throttle it down to 900 again and repeat the cycle, till the idle rpm peaks at 950. From this point on, gently screw-in ONLY the Mixture Screw to bring it down to 900rpm. Observe for Stability AND Engine vibration. If either is unacceptable, loosen the mixture screw for satisfactory idling anywhere between 900 to 950rpm.

5) If fitted with an A/C, OE or Retro, switch it on with blower at max and adjust the Fast Idle Control Device/FICD screw to yield an rpm of 1050. Switch it off to see it reverts to normal idle of 900-950. Repeat two three times to ensure stability. WHILE ADJUSTING IDLE RPM, ALL ELECTRICAL LOADS MUST BE OFF. IF THE RADIATOR FAN COMES ON, PAUSE TILL IT GOES OFF BEFORE PROCEEDING FURTHER.