O.S. Engines 21XZ-R - Manual (Page 7)

12
Outer Head
Crankcase
Mounting Lugs
Exhaust
Cover Plate
Carburetor Type 21M
Crankshaft
BASIC ENGINE PARTS
Crankshaft Ball Bearing (Front)
13
Install the exhaust seal
ring supplied.
Exhaust
Seal Ring
Glowplug
Installing the glow plug.
Insert RP7 plug supplied
into heat-sinkhead care-
fully, making sure that it is
not cross-threaded before
tightening firmly.
(All the O.S. T-Type plugs
including the RP7 are not
supplied with a washer.)
INSTALLATION OF THE STANDARD ACCESSORIES
About the Head Gasket
The engine is installed with a 0.1mm thick and
a 0.2mm thick gasket for 25% nitro fuel when it
leaves the factory. Also, a 0.2mm thick gasket
is supplied with the engine as standard. Adjust
the total thickness according to atmospheric
temperature, humidity and glowplug used.
8.5mm
Installing the
carburetor reducer
Supplied with the engine.
Standard with the carburetor when it leaves the
factory.
9mm
Insert the taper collet on the crankshaft, taking
care not to push the crankshaft back so that it
contacts the coverplate face.
INSTALLATION OF THE TAPER COLLET
Taper Collet
Cover Plate
Replace the reducer ac-
cording to the coursecon-
ditions.