O.S. Engines 18TZ(S)-T - Manual (Page 30)

Poor response
Deteriorated glowplug Replace glowplug.
Incorrect carburetor settings
Readjust low r.p.m, range with metering
needle and mixture control valve.
Incorrect setting of transmitter Exponential function.
Incorrect linkage
Make sure that throttle servo does not interfere
servo linkage.
Poor r.p.m, drop
Too much throttle opening at idle.
Close metering needle to adequate position
to lower idle r.p.m.
Incorrect carburetor fitting
Too much closing of metering needle Open the metering needle a little.
Fit carburetor securely.
Check the transmitter setting.
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