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O.S. engine MAX-18CV-RMX, Owner'S Instruction Manual

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O.S. engine MAX-18CV-RMX Owner'S Instruction Manual Download Page 7

12

CARBURETOR CONTROLS (11J)

The Needle-Valve:

The Mixture Control Screw:

The Throttle Stop Screw:

Three adjustable controls are provided on this 
carburetor. 

For adjusting the mixture strength when the throttle 
is fully open.

For adjusting the mixture strength at part-
throttle and idle speed, to obtain steady idling 
and smooth acceleration to mid speeds.

NOTE:
Readjustment may 
be necessary, occa-
sionally to allow for 
changes in fuel, gear 
ratio or clutch en-
gagement point.

Needle Valve

Mixture Control Screw

Throttle 
Stop Screw

For setting the minimum idle speed:

INSTALLATION OF THE CARBURETOR

As delivered, the engine has its carburetor 
lightly installed into the intake boss. Secure it 
as follows.

Loosen the retainer screw, rotate the 
carburetor to its correct position and make 
sure that it is pressed well down into the 
intake boss, compressing the rubber gasket, 
before retightening screw.

Rotate the retainer screw gently until it 
stops, then tighten a further 60-90˚.
Do not overtighten the screw as this will 
damage the carburetor body.

1.

2.

Rotate the retainer nut
gently until it stops.

Tighten a further 60-90˚

13

INSTALLATION 

Make sure that the engine mounting beams 
in the hull are parallel, with their top 
surfaces in the same plane. If they are not, 
the engine will not rest firmly as the engine 
mounting faces (undersides of the mounting 
lugs) are precision machined to be flat and 
in the same plane. Poor installation may not 
only cause vibration, erratic running and 
loss of performance, but may also damage 
the engine itself by deforming the 
crankcase, cylinder, etc. 

The mounting beams and adjacent hull 
structure should be as rigid as possible so 
that the engine may develop its full 
performance. Use 3mm steel screws, such 
as Allen socket-head type, with locknuts, for 
bolting the engine to the mounting beams.

1.

2.

3. If the holes in the mounting beams do not 

align exactly with the engine's mounting 
lugs, enlarge them slightly with a needle file 
so that the mounting screws pass through 
the holes smoothly without being forced.

Chamfer inside edges of bearers.

Summary of Contents for MAX-18CV-RMX

Page 1: ... supplied with the vehicle radio control equipment etc are accessible for checking at the same time 1 CONTENTS SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O S ENGINE ENGINE CONSTRUCTION NOTES WHEN APPLYING AN ELECTRIC STARTER INSTRUCTIONS TOOLS ACCESSORIES etc BASIC ENGINE PARTS CARBURETOR CONTROLS 11J INSTALLATION NOTES CONCERNING THE RECOIL STARTER GLOWPLUG STARTING THE ENGINE RUNNING IN Breakin...

Page 2: ... other possibilities generally less obvious sources of danger but which under certain circumstances may also cause damage or injury 3 WARNINGS Model engine fuel is poison ous Donotallowittocomeinto contact with the eyes or mouth Always store it in a clearly markedcontainerandoutofthe reach of children Model engine fuel is also highly flammable Keep it away from open flame excessive heat sources of...

Page 3: ...always check the tightness of all the screws and nuts especial ly those of joint and movable parts such as throttle arm Missing retightening the loose screws and nuts often causes the parts breakage that is capable of harming you 5 Adjust the throttle linkage so that the engine stops when the throttle stick and trim lever on the transmitter are fully retarded Alternatively the engine may be stoppe...

Page 4: ... is cold When the engine is hot 7 NOTES WHEN APPLYING AN ELECTRIC STARTER Do not over prime This could cause a hydraulic lock and damage the engine on application of the electric starter If over primed remove glowplug close needle valve and apply starter to pump out surplus fuel Cover the head with a rag to prevent pumped out fuel getting into your eyes We do not recommend running your boat on the...

Page 5: ...g to a fuel containing more nitro if necessary When the brand of fuel is changed or the nitro content increased it is advisable to repeat the running in procedure referred to in the RUNNING IN paragraphs Please note that with high nitro fuels although power may be increased for competition purposes glowplug elements do not last as long and engine life will be shortened Items necessary for starting...

Page 6: ... adjustments No 1 No 2 etc LONG SOCKET WRENCH WITH PLUG GRIP Recommended for easy removal and replacement of the angled and recessed glowplug the O S Long Socket Wrench incorporates a special grip NOTE SOCKET DRIVER Never use a propeller that has even a slight damage Necessary for starting the engine It is suggested to keep a starter rope as a reserve STARTER BELT It is required to tighten and loo...

Page 7: ...t stops then tighten a further 60 90 Do not overtighten the screw as this will damage the carburetor body 1 2 Rotate the retainer nut gently until it stops Tighten a further 60 90 13 INSTALLATION Make sure that the engine mounting beams in the hull are parallel with their top surfaces in the same plane If they are not the engine will not rest firmly as the engine mounting faces undersides of the m...

Page 8: ...ent with different plug types An O S No 8 glowplug is supplied with the engine Another Recommended O S plug is A5 Carefully install plug finger tight before final tighten ing with the correct size plug wrench Glowplug life Particularly in the case of very high performance engines glowplugs must be regarded as expendable items Install a plug suitable for the engine Use fuel containing a moderate pe...

Page 9: ...following procedure is suitable for these engines when the fuel containing up to 30 nitromethane are used Fill the tank completely with fuel Temporarily remove the glowplug to check that it glows bright red when energized Glow Plug Igniter Pliers Element glows when energized Replace the plug when the element does not glow or is burnt out 17 Turn the needle valve clockwise slowly until it stops Thi...

Page 10: ...he hull on the water If the engine stalls open the throttle fractionally but try to keep the engine running as rich as possible if it stops because of being excessively over rich close the Needle Valve 30 and try again Run the hull on the water until one tank of fuel has been consumed then close the Needle Valve 30 and run the hull for another full tank of fuel Repeat this procedure until 5 more t...

Page 11: ... exhaust smoke the model will lose speed At this point throttle down immediately stop the hull and reopen the Needle Valve 30 With the engine running close the throttle and allow it to idle for about five seconds then reopen the throttle fully If at this point the engine puffs out an excessive amount of smoke and the hull does not accelerate smoothly and rapidly it is probable that the idle mixtur...

Page 12: ...nally beyond the nominal break in period a slight readjustment toward a leaner needle setting may be required to maintain performance 23 REALIGNMENT OF MIXTURE CONTROL VALVE In the course of making carburetor adjustments it is just possible that the Mixture Control Valve may be inadvertently screwed in or out too far and thereby moved beyond its effective adjustment range Its basic position can be...

Page 13: ...ay also cause corrosion To reduce such risks it is helpful to inject some corrosion in hibiting oil into the engine s air intake Rotate the engine many times to distribute the oil to all the working parts 3 25 Drain the water remaining in the water cool ing head and wash out with methanol then inject corrosion inhibiting or moisture dis placing oil When cleaning the exterior of the engine use meth...

Page 14: ...if necessary Incorrect servo linkage Connect correctly after setting servo at neutral Reverse rotating direction of electric starter Mare sure it rotates counter clockwise seen from crankshaft side Recoil starter slips Inject cleaner spray into starter cord crevis on the body 27 Symptom Cause Corrective action Engine fires intermittently but does not run Insufficient fuel in the tank Fill the tank...

Page 15: ...nnected Replace seal ring Check the connections and secure them Fuel tubing from tank is split or broken Replace the tubing 29 Symptom Cause Corrective action Symptom Cause Corrective action Poor response Deteriorated glowplug Replace glowplug Incorrect carburetor settings Readjust low r p m range with metering needle and mixture control valve Incorrect setting of transmitter Exponential function ...

Page 16: ... 21823000 21816000 21817000 21815000 21884000 21818000 20810007 21408000 21833000 21811000 21832000 21812000 21807100 21213030 71608001 Description Code No No 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Water Cooled Head Assembly Gasket Set Cylinder Piston Assembly Piston Pin Piston Pin Retainer 2pcs Connecting Rod Carburetor Complete Type 11J Carburetor Retainer Assembly Propeller Nut Drive Hub Cranks...

Page 17: ...10007 21408000 21833000 21811000 21832000 21812100 21812200 21801800 21213020 73003000 73003100 73003200 71608001 Description Code No No Water Cooled Head Assembly Gasket Set Cylinder Piston Assembly Piston Pin Piston Pin Retainer 2pcs Connecting Rod Carburetor Complete Type 11J Carburetor Retainer Assembly Propeller Nut Drive Hub Crankshaft Ball Bearing Front Crankcase Crankshaft Ball Bearing Rea...

Page 18: ... Needle Valve Assembly O Ring 2pcs No 14 Universal Nipple Assembly Throttle Stop Screw Carburetor Body Rotor Spring Carburetor Rotor Dust Cover Throttle Lever Throttle Lever Fixing Nut Mixture Control Screw O Ring 2pcs Carburetor Rubber Gasket 21285901 27881820 21881950 22681310 21884100 22481506 21884200 21283210 22681419 21481420 21484600 27881820 22615000 1 1 1 1 2 2 3 4 5 6 7 8 9 9 1 10 ...

Page 19: ...ER JOINT TUBE 15 3 16 For Carburetor Nipple For Carburetor CAP SCREW SET M2 6x7 10pcs set M2 6x18 5 pcs set 3 pcs set The specifications are subject to alteration for improvement without notice 37 M5x0 8 11 31 4 39 25 15 41 69 25 27 5 50 5 18CV RM W 11J THREE VIEW DRAWING SPECIFICATIONS Displacement Bore Stroke Practical R P M Power output Weight Dimensions mm 3 0 cc 0 183 cu in 16 0mm 0 629 in 15...

Page 20: ...NS Displacement Bore Stroke Practical R P M Power output Weight Dimensions mm C Copyright 2005 by O S Engines Mfg Co Ltd All rights reserved Printed in Japan TEL 06 6702 0225 FAX 06 6704 2722 6 15 3 Chome Imagawa Higashisumiyoshi ku Osaka 546 0003 Japan U N E Q U A LLED QUALITY PRECISION PERFOR M A N C E E S T A BLISHING THE STANDARDS OF EXCELLE N C E URL http www os engines co jp 60091580 020500 ...

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