O.S. Engines 61RX-H WC - Manual (Page 7)

Because of 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-61SX-H RING "WC" is an up-rated
version of the MAX-61SX-H RING helicopter
engine. It is aimed at FAI World
Championship(hence the suffix 'WC') Class
F3C competition. Performance has been
increased and the Type 60B carburetor has
been modified for easier adjustment. High
quality and high performance have been
confirmed in exhaustive flight testing and
in F3C contest results. The 61SX-H has a
traditional sideexhaust layout, whereas the
61RX-H features a rear exhaust for users
who prefer such a configuration. In all other
respects, the two models are of identical
design.
INTRODUCTION
6