O.S. Engines 21RG-X - Manual (Page 4)

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The MAX-21RG Series has been developed for
1/8 scale off-road 'buggy' and scale cars.It
provides a combination of performance and
value that brings it within the reach of a larger
group of R/C model vehicle enthusiasts, from
newcomers to experienced competitors. All
major parts of the MAX-21RG have been
redesigned. Its potential is very close to that of
the top-ranking MAX-21RZ motors, but it
remains easy to operate and is considerably
less expensive. The MAX-21RG has a
conventional crankshaft, while the MAX-
21RG(P) employs a special crankshaft with
integral pilot shaft. The MAX-21RG-X and
MAX-21RG(P)-X have the addition of a built-in
O.S. recoil starting system. The starter unit
eliminates the need for a separate electric
starter and battery.
NOTE: With this engine, the piston will feel tight at
the top of its stroke when the engine is cold. This
is normal. The piston and cylinder are designed to
achieve a perfect running clearance when they
reach their normal running temperatures.
BASIC ENGINE PARTS
Carburetor
Crankshaft
Crankcase
Beam Mount
Recoil Starter
Assembly No.5
Heatsink Head
Starter Handle
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ENGINE INSTALLATION
Make sure that the vehicle's engine mounting surfaces
are level and in the same plane. Poor installation may
cause distortion of the crankcase, bearings, etc.,
resulting in erratic running and loss of performance.
The recommended screws for securing the engine are
3mm or 4-40 steel Allen hexagon socket type.
If existing holes in the engine mount do not align
perfectly with engine mounting lugs, enlarge them
slightly with a needle-file so that screws align with the
mounting holes.
Chassis
Chamfer inside edges of bearers.
INSTALLING
THE GLOWPLUG
Install the washer on the
glowplug and insert carefully into
cylinder-head, making sure that it
is not cross-threaded before
tightening firmly.
Glow plug
Washer
D o n o t a l l o w b o t t o m
o f c r a n k c a s e t o t o u c h
c h a s s i s .