O.S. Engines 91FX-HGL - Manual (Page 7)

Because of this initial tightness, a
standard electric starter may have
difficulty in rotating the engine when
cold, before it has been adequately
run-in. In this case, use a high-torque
type starter.
DO NOT, however, confuse tightness
with the symptoms of hydraulic lock
caused by an excess of fuel within the
cylinder - often the result of over-
priming.
Attempting to force the engine to turn
over in this condition may cause
internal damage. Instead, remove the
glowplug, invert the engine and eject
surplus fuel from the combustion-
chamber.
Note:
The MAX-91FX-HGL RING is a high-
performance, high-quality engine that has
been specifically develpped for radio-
controlled bigger size helicopters.
This is ideal for scale models which
require more power and torque for heavier
weight.
This motor is produced by the world's
oldest and largest model engines design
and manufacturing company, a company
that has built more helicopter engines
than any other manufacturer worldwide.
INTRODUCTION
Note:
This engine is designed for quiet flights
- i.e. to run lower rpm. Set the model
mechanics so that engine may run
below 14,000rpm. Over-revving may
result in damaging the engine.
6