Step III-
If the engine accelerates correctly, according to the above test, set it at idle speed and accelerate
to full speed. Repeat twice more. If the engine functions correctly, go to Step IV. If it cuts out, open the low
speed needle by 5–10 minutes more.
If the engine does not respond to acceleration fast enough, keep closing the low speed needle until the engine
starts to cut out in response to throttle opening. At that point reopen the low speed needle by 5–10 minutes.
Step IV-
If the engine reacts correctly set it at full speed. If revolutions do not drop, the engine has been
adjusted successfully. If revolutions seem to drop, open the high speed needle by about 5–10 minutes.
Caution!
The engine must be stopped while you adjust the carburetor in order to prevent injury by the propeller.
Starting and running a new engine:
Having started the engine, leave it running for about 5 minutes at a higher idle speed. Then run it for about 20
minutes, while changing revolutions from idle to 1/2–3/4 of the range and shortly holding each position—gradually
prolong the holding periods. After 10 minutes of operation open the throttle to maximum for a period of about one
minute. At this point stop the engine and let it cool down. Then restart it and check the adjustment. If everything
is all right, you can make your first flight. During first few flights do not overload the engine and do not let it run at
high revolutions for long periods of time (very important during hot weather). Use up all the fuel that was mixed with
the oil that is included with your engine. From then on, fuel and oil should be mixed in the proportion 40:1
5
Trouble-Shooting Guide
If the engine does not start
- check and use a new spark plug if needed. (Check
the spark: put the plug into the cable end and by
turning the engine you´ll see the necessary spark.
Note: The plug must touch a metal part of the engine.)
- check fuel lines.
- check for proper mechanical function by turning
the engine over.
- check that the carburetor is correctly installed.
- remove the carburetor cover from the feed side;
check the filter and blow off carburetor with
compressed air (
Caution:
When using compressed
air, use eye protection.
); when re-assembling be
careful to maintain the proper order of the components.
- check the vacuum feed line.
Mechanical Faults
If the engine can not be turned over easily
- a likely cause is the piston in the cylinder is seized:
loosen and unscrew the cylinder bolts.
- carefully remove the cylinder.
- visually examine the piston and crankcase to find
the likely cause of the engine’s mechanical problem.
Note: Mechanical repairs must always be completed
by a professional service department.