Introduction, Basic Engine Parts - O.S. engine max-21RG-M Owner's Instruction Manual

The O.S. "RG Series" is a high-performance
water-cooled marine engine for small radio-
controlled boats, especially sport type hulls.
A companion model, the MAX-21RG-MX in-
corporating a recoil starter system is also
available.
Standard accessories
Exhaust Header Pipe
Glow Plug No.8
Flywheel No2E
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.
• We do not recommend running your boat
on the sea, or in any other saltwater
environment. Under such conditions, it is
difficult to prevent the engine from
becoming corroded and, eventually,
inoperative.
BASIC ENGINE PARTS
Water Cooled Head
Carburettor
Type 20J
Cranshaft
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.
6
21RG-MX
MAX-
Glow Plug No.8
Starter Handle
Recoil Starter
Beam Mount
Assembly No.5
Crankcase
Glow plug
Washer