Os-engines 21XM Manuel d'utilisateur

It is of vital importance, before attempting to operate your engine, to read the general 'SAFETY INSTRUCTIONS AND WARNINGS' section on page

Before starting the engine for the first run of the day, remove the glowplug and check the engine by rotating the flywheel by hand. It should rotate s

STARTINGSet the needle-valve. Turn the needle clockwise slowly, without forcing, until it stops. Then, reopen the needle-valve 2-1/2turns countercloc

RUNNING-IN (''Breaking-in'')For long life and high-performance, every engine needs to be properly 'run-in' or 'brok

ADJUSTMENTOpen the throttle slightly from the idling position and start the engine, following the procedure described previously.Lower the boat into t

CARBURETTOR CLEANLINESSProper functioning of the carburettor depends on its small fuel orifices remaining clear. The minute particles of foreign matte

✽ O.S. 'Super-Filters' (large and small) are available, as op-tional extras,to deal with this problem. One of these filters, fit-ted to the

423SymptomFactorCauseCorrective actionRecharge the electric starter battery.Recharge lead-acid cell or replace dry battery. (Note: An unused, or almos

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7 1802 1002 7721 7004 1614 0002 3851 0002 3981 7007 1532 0002 5382 0002 3805 0002 3817 0002 3906 0002 3803 0102 3841 0002 4025 9232 3913 0002 3875 000

2 4981 4052 6381 5012 5381 2032 6781 3092 4881 8242 6781 5062 5382 1002 5381 220No.11-1233-1456Throttle Lever Assembly Set-screwCarburettor RotorMix

CONTENTS2~3456789101112~13141516171819SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINEFITTING THE GLOWPLUG, INSTALLATION OF THE CARBURETTORBASI

Displacement Bore Stroke Practical R.P.M. Power output Weight3.46 c.c. ( 0.211 cu.in.)16.6 mm ( 0.654 in.)16.0 mm ( 0.630 in.)3,000~25,000 r.p.m.1.3

MEMO20

C Copyright 2000 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan.UNEQUALLEDQUALITYPRECISION&PERFORMANCEESTABLISHINGTHESTANDAR

Remember that your engine is not a " toy ", but a highly efficient internal-combustion machine whose power is capable of harming you, or oth

NOTESThis engine was designed for model boats. Do not attempt to use it for any other purpose.Mount the engine in your model securely, following the m

FITTING THE GLOWPLUGThe O.S. MAX-21XM is a high-performance water-cooled outboard marine engine for small and medium-size radio-controlled outboard bo

BASIC ENGINE PARTSCarburettor(OS TYPE 20J)Needle-ValveWater-Cooled Cylinder HeadE-2050 SilencerWater Inlet TubeExhaust OutletsCooling Water PickupCarb

PIPINGConnect the water inlet tube (L=170mm) and oil transfer pipe (L=65mm) securely as shown on page 5. In the event of either tube becoming damaged,

FUELUse only top quality commercial model two-stroke engine fuel. For consistent performance and long engine life, it is essential to use fuel contain

PROPELLERThe MAX-21XM's special carbon-fibre propeller has a diameter of 42mm and a P/D ratio of 1.2. If any other propeller is substituted, make