15.10. CARBURETTOR ADJUSTMENTS

- Make sure the ignition box is set on time and that de valves are properly adjusted.
- Make sure the engine has the right temperature. (driven for at least 10 minutes)
- Connect a revolution counter.
- Adjust the number of revolutions using the stop bolt of the first port (21). The number of revolutions must be between 800-850 revolutions per minute.
It sometimes happens that the stationary rpm cannot be fine-tuned. In this case please proceed as follows:
- Clean and check the carburettor as described above
- Check that the retraction spring of the choke is installed.
- Check that all screws are installed and properly tightened.
- Adjust the CO emission as described below.

3C.12 Adjusting the CO

Obviously this should be done using a CO meter, but if the entire system is disordered, you can do a rough safe setting of the CO percentage yourself.
- Entirely screw in the CO adjusting screw and do this with great care! The screw falls in its seat in a tapered way and can very easily be damaged.
- Then turn the screw back two turns (up).
- Adjust the rpm to approximately 1000 revolutions per minute; this is slightly higher than stationary.
- Turn the CO adjusting screw back even further until the rpm increases. This is approximately half a turn.
- If all is well, you made the correct adjustment. However, if the engine is still running turbulently, it might be of help to alter the adjustment of the CO screw some more.
- Then again set the stationary rpm using the stop screw for the first stage.