MLD™ Engines

• Avoid adjusting your high-speed (outside) needle on the carburetor during break-in process.
• Avoid full power for extended periods of time while breaking in your engine.
• Make sure that the engine has adequate cooling during break-in. Alternating between full and low throttle during break-in is recommended.
• Keep your engine slightly rich during this process reduces carbon deposit on your spark plug.
• Break-in your MLD-28cc by flying is acceptable as long as recommendations are observed.


MANUAL STARTING: (Important: wear a thick glove)

1. Install propeller on prop spacer for comfort while flipping through compression.
2. Always position the propeller so that the magnets are 20° clockwise from the magnet pick up.
3. Have someone help you hold the airplane while you start the engine.
4. Make sure the ignition is OFF, close the choke on the carburetor and open the throttle slightly from the idle position.
5. Rotate the propeller slowly about 10 to 20 times (more in winter) until fuel begins to be drawn into the carburetor. Another way to prime the engine is to rotate the prop clockwise from bottom dead center to top dead center (compression) and then counterclockwise back to bottom dead center repeatedly.
6. Switch the ignition to ON.
7. Flip the propeller clockwise several times briskly.
8. After you hear some initial firing sounds, move the choke lever to the OPEN position.
9. Set the throttle setting or screw to a high idle.
10. Flip the prop through compression rapidly. If this is done properly, the engine will start between the first and the eighth flip of the prop.
11. After starting, idle the engine for two to three minutes. Open and close the throttle slowly until your engine runs smoothly at idle and at full throttle. Acceleration should also be smooth.
12. If your engine does not start, repeat the procedure.

ENGINE ADJUSTMENTS

“L” needle: air/fuel mixture for low RPM situation. Open the needle 1-3/8 turns from the closed position (±1/4 of a turn in winter, adjust 1/8 turn at a time).
“H” needle: air/fuel mixture for high RPM situationm. Open the needle 2 turns from the closed position (±1/4 of a turn in winter, adjust 1/8 turn at a time).
IDLE Screw: controls carburetor valve, provide RPM setting. Once your engine operates properly at both high and low speed, and your low RPM is not as low as you wish, then and only then do you adjust your engine’s idle screw.

ELECTRIC STARTER STARTING

1. Make sure you use a good quality, lightweight aluminum spinner [PG-51 or START100].
2. Have someone help you hold the airplane while you start it.
3. Make sure the ignition is OFF, close the choke plate on the carburetor and open the throttle slightly from the idle position.
4. Use your electric starter to turn the engine over for several seconds.
5. Switch the ignition to ON and open the choke.
6. Set the throttle to high idle and use your electric starter to turn over the engine until it starts.
7. After starting, let the engine idle for two to three minutes. Open and close the throttle slowly until the engine runs smoothly at idle and at full throttle. Acceleration should also be smooth.
8. If your engine does not start, repeat the procedure.

• Always make high speed and low-speed adjustments with the ignition and the engine OFF.
• Adjust your idle, low and high settings independently to reduce confusion.
• Do not change your mixture settings needlessly. Normally, only the high speed mixture requires minor (1/4 turn max) adjustment due to temperature, elevation or humidity change.

Use quality 2-cycle model airplane engines at recommended oil to fuel ratio. We suggest break-in with 30:1 gasoline to oil ratio, and 45:1 to 50:1 thereafter. Synthetic 2-cycle oil can be also be used, and the ratio will vary according to oil mfg.