O.S. Engines 21VG-PX - Manual (Page 17)

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Cause Corrective action
Cause Corrective action
Poor response
Deteriorated glowplug Replace glowplug.
Incorrect carburetor settings
Readjust low r.p.m. range with metering
needle or mixture control screw.
Incorrect setting of transmitter Exponential function. Check the transmitter setting.
Poor r.p.m. drop
Throttle position open too far.
Close the mixure control screw to adequate
position to lower idle r.p.m.
Carburetor not fully seated Install carburetor securely.
Incorrect linkage
Make sure the throttle servo linkage does not
bind and is connected correctly.
Metering needle closed too far. Open the metering needle a little.
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CARE AND MAINTENANCE
Do not forget to clean the filters regularly to remove
dirt and lint that accumulate on the filter screens.
Also, clean the carburetor itself occasionally.
At the end of each operating session, drain out any
fuel that may remain in the fuel tank.
Afterwards,energize the glow-plug and try to restart
the engine, to burn off any fuel that may remain
inside the engine. Repeat this procedure until the
engine fails to fire. Do this while the engine is still
warm.
Care and maintenance after the running is very
important. Be sure to carry out the following
procedures.