O.S. Engines FS-91 II FI - Manual (Page 17)

17
10-15%
15-20%
F-4020
2,000-2,100r.p.m.
6,500-7,000r.p.m.
8,900-9,200r.p.m.
General reference for engine speed Case of a 13 x 9, 2-blade propeller
Full slow engine speed
Intermediate slow engine speed
Full high engine speed
Note:
The engine speed will not be the same depending on propeller variations, engine
mounting method, linkage method between the throttle servo and air valve, and
differences in the fuel used.
If the engine speed is quite different from those shown above, it may mean that the setting
for the throttle servo and air valve linkage is incorrect or the fuel injection trim volume has
changed considerably. Check these items by returning to the procedure for readjustment.
When engine speed is abnormally high, always make sure to stop the engine and inspect
the problem since this can cause damage to the engine.
In cases when there are considerable temperature changes during the course of a day
such as in the spring and autumn, the fuel injection volume may not be able to keep with
engine performance to a certain extent. If this happens, readjust the injection trim
adjustment dial (spare channel dial) before further use.
Note:
ENGINE STARTING
Fuel
Silencer
nitromethane
oil
(RPM shown are with the standard setting.)
Basic setting It is suggested to start with this setting.