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O.S. engine MAX-12CV Series, Owner'S Instruction Manual

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O.S. engine MAX-12CV Series Owner'S Instruction Manual Download Page 7

INSTALLING THE GLOWPLUG

Carburetor 

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.

Fit washer to glowplug and 
insert carefully into cylinder-
head, making sure that it is 
not cross-threaded
before tightening firmly. 

BASIC ENGINE PARTS

The MAX-12CV and MAX-12CV-X are 
high-performance engines for 1/10 
class R/C racing cars. The MAX-12CV-X 
is equipped with a built-in recoil starter 
system which eliminates the need for a 
separate electric and starter battery.

Crankshaft

Glow plug

Washer

Drive Hub

Crankcase

Beam Mount

Starter Handle

Heatsink Head

Recoil Starter
Assembly No.5

MAX-

12CV-X

6

Summary of Contents for MAX-12CV Series

Page 1: ...ontained therein Also please study the entire contents of this instruction manual so as to familiarize yourself with the controls and other features of the engine Keep these instructions in a safe place so that you may readily refer to them whenever necessary It is suggested that any instructions supplied with the vehicle radio control equipment etc are accessible for checking at the same time ...

Page 2: ...S THREE VIEW DRAWING CONTENTS SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O S ENGINE INTRODUCTION BASIC ENGINE PARTS INSTALLATION AIR CLEANER TYPE102 NOTES CONCERNING THE RECOIL STARTER GLOWPLUG TOOLS ACCESSORIES etc CARBURETTOR CONTROLS PRESSURIZED FUEL SYSTEM STARTING THE ENGINE RUNNING IN Breaking in 2 5 6 7 8 8 9 9 10 10 11 11 12 14 15 27 16 16 17 17 18 19 20 23 24 25 26 12 13 13 1 ...

Page 3: ...equest that these instructions are also passed on to its new owner SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O S ENGINE The advice which follows applies basically to ALL MODEL ENGINES and is grouped under two headings according to the degree of damage or danger which might arise through misuse or neglect WARNINGS NOTES These cover events which might involve serious in extreme circumstances even ...

Page 4: ...es of sparks or anything else which might ignite it Do not smoke or allow anyone else to smoke near to it Never operate your engine in an en closed space Model engines like automobile engines exhaust deadly carbon monoxide Run your engine only in an open area Model engines generate considerable heat Do not touch any part of your engine until it has cooled Contact with the muffler silencer cylinder...

Page 5: ... of the most powerful highspeed engines may eventually impair your hearing and such noise is also likely to cause annoyance to others over a wide area The wearing of safety glasses is also strongly recommended Take care that the glowplug clip or battery leads do not come into contact with rotating parts Also check that the linkage to the throttle arm is secure For their safety keep all onlookers e...

Page 6: ...ompression WITHOUT the glowplug battery being reconnected Do not attempt to disassemble the recoil starter of the 15CV X If you do so the very strong spring inside will be suddenly ejected This can be very dangerous Do not extend the starter cord more than 45cm 18 Do not abruptly release the operating handle Allow the cord to rewind smoothly while still holding the handle Pull the operating handle...

Page 7: ... glowplug and insert carefully into cylinder head making sure that it is not cross threaded before tightening firmly BASIC ENGINE PARTS The MAX 12CV and MAX 12CV X are high performance engines for 1 10 class R C racing cars The MAX 12CV X is equipped with a built in recoil starter system which eliminates the need for a separate electric and starter battery Crankshaft Glow plug Washer Drive Hub Cra...

Page 8: ...ith a needle file so that screws enter vertically Chassis Chamfer inside edges of bearers NOTE Where spacers are supplied joined in pairs see sketch separate them as shown Either face may be placed downwards Avoid forcing the screws Secure with locknuts If the bottom of the recoil starter housing would otherwise touch the car chassis fit the engine mount spacers supplied between the engine s mount...

Page 9: ...ave been previously used on the outside of the air intake Press the air cleaner body firmly over the carburetor air intake Make sure that the outer rim of the air intake engages the internal annular groove in the air cleaner failure to do so may result in the air cleaner falling off See sketch right INSTALLATION OF THE CARBURETOR As delivered the engine has its carburetor lightly fit into the inta...

Page 10: ...ger and thumb to redistribute the oil REPLACEMENT OF ELEMENTS It is advisable to replace the upper filter element with a new one after not more than one hour of running time It is not necessary to discard the lower element as frequently but be sure to change it when it becomes soiled NOTES CONCERNING THE RECOIL STARTER 12CV X ONLY REMINDER Do not attempt to disassemble the recoil starter If you do...

Page 11: ...load allowing higher rpm the plug becomes hotter and appropriately fires the fuel air charge earlier conversely at reduced rpm the plug become cooler and ignition is retarded Since the compatibility of glowplug and fuel may have a marked effect on performance and reliability it may be worthwhile to choose the R C type plug found most suitable after tests Recommended O S plugs are A3 A5 and No8 Car...

Page 12: ...outputisincreased uptoacertainpoint as the nitromethane content of the fuelis increased As a starting point we recommend a fuel containing 10 20 nitromethane changing to a fuel containing more nitro only if necessary When the nitro content of the fuel isincreasedorthebrandoffuelischanged itisadvisable to initially run the engine with a richer needle valve setting so that the optimum setting for th...

Page 13: ...Screw Throttle Stop Screw Ball Link NOTE Readjustment may be necessary occa sionally to allow for changes in fuel for mulae gear ratio or clutch engagement point 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 idling speeds to obtain steady idling and smooth accelera...

Page 14: ...ontrol Valve Assembly Screw Throttle Stop Screw The somewhat violent changes of vehicle attitude that occur in off road running combined with the fact that in buggy type cars the fuel tank is often located some distance from the carburetor means that fuel head at the carburetor can vary and upset running Therefore it is recommended that a muffler pressurized fuel feed system be used Never run your...

Page 15: ...wplug battery lead to heat the plug filament and start the engine Re check the needle valve and throttle settings Turn the needle valve clockwise slowly and gently until it stops This is the fully closed position Do not use force to turn the needle valve beyond this point Open Close Needle Valve In case of the 10C caburettor In case of the 10E R caburettor Set the throttle stop screw so that the m...

Page 16: ... several times 3 0 º 3 0 º To stop the engine close the throttle to idling speed then shut it off completely with the trim lever on the transmitter To cut off the fuel supply pinch the fuel delivery tube to the carburetor If the engine should need to be disassembled e g for cleaning or minor parts replacement it is advisable to return the Needle Valve to the original rich starting setting and chec...

Page 17: ...aking note of the improvement in performance Continue with further runs gradually reducing the Needle Valve setting and aiming to achieve the highest straight line speed Remember however that if the Needle Valve is shut down too far the engine will overheat and accompanied by visibly diminished exhaust smoke the model will lose speed At this point throttle down immediately stop the vehicle and reo...

Page 18: ...rries the risk of seriously damaging the engine through over revving and overheating With the optimum mixture control position light smoke is visible during high speed running and the engine revolutions increase smoothly during acceleration Remember that if the engine is operated with the fuel air mixture slightly too lean it will overheat and run unevenly As with all engines it is advisable to se...

Page 19: ...ble 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 found by first rotating the Mixture Control Valve until its slotted head is flush with the carburetor body The valve is then screwed in exactly 2 5 turn to re establish its neutral position Mixture Control Valve Carburettor Body First r...

Page 20: ...nergize the glow plug and try to restart the engine to burn off any fuel that may remain inside the engine Repeat this procedure until the engine fails to fire Do this while the engine is still warm Then inject some after run oil into the engine and rotate the engine with an electric starter for 4 to 5 seconds to distribute the oil to all the working parts Note 5 Do not inject after run oil into t...

Page 21: ...MAX 12CV EXPLODED VIEW Type of screw C Cap Screw M Oval Fillister Head Screw F Flat Head Screw N Round Head Screw S Set Screw 1 2 3 4 5 6 7 8 9 0 q w e r t C M2 6x12 C M2 6x7 20 ...

Page 22: ...W 3 filter elements Screw Set Glow Plug A3 Gasket Set Crankshaft Crankshaft Ball Bearing Rear Crankcase RED Crankshaft Ball Bearing Front Carburettor Retainer Carburettor Complete Type 10C Connecting Rod Piston Pin Cylinder Piston Assembly Heatsink Head RED Description Code No Carburettor Complete Type 10E R Propeller Nut Drive Hub Cover Plate RED Heatsink Head GREY No 2 1404 310 2 1404 320 Heatsi...

Page 23: ...MAX 12CV X EXPLODED VIEW Type of screw C Cap Screw M Oval Fillister Head Screw F Flat Head Screw N Round Head Screw S Set Screw 1 2 3 4 5 6 7 8 9 0 q w e r t C M2 6x12 M M2 6x7 y u u 1 u 2 M M2 6x7 22 ...

Page 24: ...ankshaft Ball Bearing Rear Crankcase RED Crankshaft Ball Bearing Front Carburettor Retainer Carburettor Complete Type 10C Connecting Rod Piston Pin Cylinder Piston Assembly Heatsink Head RED Description Code No Carburettor Complete Type 10E R Propeller Nut Drive Hub Starting Shaft Heatsink Head GREY No 2 1404 310 2 1404 320 Heatsink Head BLUE 2 1404 330 Heatsink Head NATURAL 2 1404 000 12CV Machin...

Page 25: ...ll Link No 4 Dust Cover Metering Needle Assembly Slide Valve Slide Valve Guide Screw Carburetor Body O Ring 2pcs Needle Valve Assembly Throttle Stop Screw O Ring S 2pcs O Ring L 2pcs Mixture Control Valve Assembly Description Code No 5 4 3 2 1 9 7 6 8 0 1 1 1 2 3 1 C M3 5x8 2 2615 000 2 2781 800 4 6066 319 2 1285 600 2 1285 640 2 7881 820 2 1285 901 2 1285 220 2 1286 100 2 1286 200 2 1286 400 2 18...

Page 26: ...00 2 1283 210 2 2681 419 2 1481 420 2 1481 600 0 1 0 9 8 7 6 5 4 3 2 1 7 1 7 2 0 2 2 2615 000 No Carburetor Rubber Gasket Dust Cover Carburetor Body O Ring 2pcs Needle Valve Assembly Throttle Stop Screw Mixture Control Screw Description Code No Throttle Lever Fixing Nut 1 1 2 7881 820 Throttle Lever Carburetor Rotor Rotor Spring Nozzle Assembly O Ring Locknut O Ring 2pcs Fuel Inlet 5 4 3 2 1 9 7 6...

Page 27: ...For Tamiya TG10 For Tamiya TGX No 8 A3 A5 Super Air Cleaner 102S 101 102 Filter Elements 6pcs Super Joint Tube 15 T 1020 Tuned Silencer Crankshaft Clamp 1012 Long Socket Wrench With Plug Grip 10C Automatic Carburettor 21286000 12CV Machine Head 72001110 BLUE 72001100 RED φ3 73300305 φ7 73300712 φ10 73301012 Dust Cap Set For Carburettor Nipple For T 1020 Tuned Silencer For 10C 10E R Carburettor For...

Page 28: ...REE VIEW DRAWING Dimensions mm 2 11 cc 0 129cu in 14 0 mm 0 551in 13 7 mm 0 539in 3 000 30 000 r p m 0 56 bhp 29 000 r p m 211g 7 45oz 12CV 269g 9 50oz 12CV X 190g 6 70oz 12CV Hyper 248g 8 75oz 12CV X Hyper 25 39 40 40 41 33 5 17 6 90 6 74 6 27 5 25 70 7 90 2 38 38 M5x0 8 35 5 11 31 4 12CV 27 ...

Page 29: ...MEMO 28 ...

Page 30: ...eserved Printed in Japan 120104 TEL 06 6702 0225 FAX 06 6704 2722 6 15 3 Chome Imagawa Higashisumiyoshi ku Osaka 546 0003 Japan URL http www os engines co jp 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 ...

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