Final Check; Start Up Procedure - Compact Radial Engines MZ201 Instruction And Maintenance Manual

The engine is now ready to be used as intended.
After having inspected all the bolts, there is one final and extremely important component to be checked: the
spark plug. The spark plug is a sufficiently reliable indication of the carburation.
Remove the spark plug and check the colour of the ceramic insulator at the electrode end. If it has turned a
mid-brown colour, the carburettor has been adjusted correctly. Conversely, if it has turned black or dark
brown, the fuel is too rich. If the ceramic is a light brown or sand colour, it means the fuel is too lean.
Adjust the carburettor accordingly (see ADJUSTING THE CARBURETTOR)
Remember that an excessively rich blend will not cause any immediate problems to the engine except that
carbon deposits will form prematurely.
Too weak or lean a blend, however, may cause irreversible damage to the cylinder and piston
Always use a spark plug with an adequate heat rating
Press the primer bulb 3 or 4 times to induce a small amount of fuel into the carburettor when the engine is
cold.
Check that the throttle is in the starting position (no intake or too much intake will hinder the starter motor
and cause problems in starting up the engine).
Ensure the contact is on "start" and that you are able to disconnect the circuit immediately, if necessary.
a) To start manually: pull the manual recoil starter handle slowly until it begins to offer resistance,
then pull hard.
b) To start electrically: following the instructions given above, press the start button until the
engine starts (press no more than 4 to 5 times, taking care not to overheat the starter motor).
After starting the engine, reduce the intake gradually and disengage the starter as soon as possible
(prolonged use of the starter may damage the motor).
If the engine does not start, check the fit of the spark plug caps and that the switch is on "start". If nothing
still happens, remove and inspect the spark plugs.
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If the spark plugs are damp, the engine is flooded. With the sparkplugs removed and ignition turned off
and throttle wide open crank the engine to discharge any excess fuel. Replace the spark plugs after
having dried it carefully and repeat the starting procedure.

FINAL CHECK

START UP PROCEDURE

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