O.S. Engines FS-91 II FI - Manual (Page 18)

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(1) Always be sure to close the throttle stick to idle position before applying the starter and starting
battery. (Do not attempt to start the engine manually since this is potentially dangerous.) After
the engine has started, gradually move the throttle stick on the transmitter to the full high
position. Then gradually move the throttle stick to the full slow position and disconnect the
starting battery. Again move the throttle stick to the full high position and check the engine
speed.
NOTE: Avoid moring throttle stick to higher than intermediate slow position, after
injection trim adjustment is completed.
Adjust the injection trim volume with the injection trim adjustment dial (spare channel dial) so
that engine speed stabilizes at around 8,900-9,200 rpm (this may vary slightly depending on
the propeller used). If LED lights green, mixture can be adjusted richer, and it LED lights red,
mixture can be adjusted leaner. The contents of the adjustment are instantanously stored in
memory. Move the stick to the slow position. At this time, return the injection trim adjustment
dial (spare channel dial) to the center (0) position.
Put the throttle stick in the center position. After a short time (5-10 seconds), check the engine
speed. Adjust the injection trim volume with the injection trim adjustment dial (spare channel
dial) so that engine speed stabilizes in the vicinity of 6,500-7,000 rpm (this may vary depending
on the propeller used). The contents of the adjustment are instantaneously stored in memory. (2)
Put the throttle stick in the full slow position. Return the injection trim adjustment dial (spare
channel dial) to the center (0) position. Adjust the throttle trim so that engine speed at full slow
stabilizes in the vicinity of 2,000-2,100 rpm. (3)
Reconfirm whether engine speed reliably responds to throttle operation at all speeds, and
whether the throttle stick responds from slow operation to quick operation. Adjustments are
satisfactory if engine speed remains stable. (4)
Note:
Injection trim adjustment uses the same adjustment dial for both intermediate slow and
high. (The use of an incremental system allows the same dial to be used for both.) If
adjustment is still not adequate when the dial is turned all the way to the right or left during
adjustment, temporarily move the throttle stick to the full slow position and move the dial to
the center (0) position. This also allows adjustment of the air-fuel mixture. The injection
trim volume at intermediate slow and full high do not change even if the adjustment trim
dial is moved with the throttle stick in the full slow position.
In the case of a new engine, start adjustment of injection trim volume on the rich side (LED
lights green) and then readjust after making 3 or 5 flights.
This engine employs pressurized fuel feed system, applying high pressure to the fuel tank from
the crankcase. When starting first time or starting after long, storage or starting in winter when
the temperature is less than 10
0 C, it makes a start easy to apply an electric starter for about 5 to
10 seconds without connecting the plug battery.