O.S. Engines 12XZ Speed Spec II - Manual (Page 7)

12
BASIC ENGINE PARTS
Outer Head
Crankcase
Mounting Lugs
Exhaust
Cover Plate
Carburetor
Type 12F(B)
Crankshaft
Crankshaft Ball Bearing (Front)
13
INSTALLATION OF THE STANDARD ACCESSORIES
Install the exhaust seal
ring supplied.
Exhaust
Seal Ring
Glowplug
Installing the glow plug.
Insert RP6 plug supplied
into heatsink-head care-
fully, making sure that it is
not cross-threaded before
tightening firmly.
(All the O.S. T-Type plugs
including the RP6 are not
supplied with a washer.)
About the Head Gasket
These engines are equipped with two head
gaskets of 0.1mm thick and 0.2mm thick. It
is suggested to adjust the total thickness
according to atmospheric temperature,
humidity and glowplug used.
At early stage of running-in, when a
glowplug tends to burn out early or when
high nitromethane content fuel is used, try
to run the engine with both gaskets or
removing the 0.1mm gasket.
When low nitromethane content fuel is
used, try to run the engine removing the
0. 2mm gasket.
INSTALLATION OF THE DUST CAP SET
If the engine is to be stored or out of use for a while,
install the included exhaust and carburetor dust caps
to prevent foreign matter from entering the engine.