O.S. engine MAX-91SZ-Hring Owner's Instruction Manual page 5

Note on heating the glow plug
The heatsink head on the engine is
treated with Alumite which does not
conduct current. Therefore, when
heating a glow plug, connect one
lead to the glow plug and the other
to the head of cover plate retaining
screw.
INTRODUCTION
This is a high performance engine
expressly designed
competition. The engine uses the
same mounting hole spacing as the
O.S. 61SX-H RING WC making them
interchangeable. However, higher gear
ratio is required for the MAX-91SZ-H
RING which generates
power at lower rpm than the 61 size
engines. New design 60M-C carburetor
has three adjustable controls which
enables independent adjustment at
idling, hovering and high speed.
Note:
As delivered, the carburetor is not
installed on the engine.
Example
8
Standard accessories
for F3C
Carburetor Complete 60M-C
Carburetor Rubber Gasket
Carburetor Retainer Assembly
maximum
Head Gasket
Glow Plug No.8
Woodruff Key
Needle Adjusting Screw (M2.6x5 2pcs.)
Instruction manual
9
(M2.6x18)
0.2mm 0.1mm