OS ENGINE MAX-21RG-M MAX-21RG-MX Manual
Contents
1. dean max 21RG M amp max 21RG MX OWNER S INSTRUCTION MANUAL It is of vital importance before attempting to operate your engine to read the general SAFETY INSTRUCTIONS AND WARNINGS section on pages 2 5 of this booklet and to strictly adhere to the advice contained therein e Also please study the entire contents of this instruction manual so as to familiarize yourself with the controls and other features of the engine e Keep these instructions in a safe place so that you may readily refer to them whenever necessary e It is suggested that any instructions supplied with the vehicle radio control equipment etc are accessible for checking at the same time SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O S ENGINE 2 5 INTRODUCTION BASIC ENGINE PARTS 6 INSTALLATION 7 8 NOTES CONCERING THE RECOIL STARTER eee 8 9 ei Belt EE 9 10 TOOLS ACCESSORIES etc 10 11 CARBURETTOR CONTROLS 12 STARTING amp INITIAL RUNNING IN Breaking in 13 15 ADJUSTMENT 16 17 Ne CONTENTS amp PARTS LIST ACCESSORIES S CARE AND MAINTENANCE 18 19 CHECKING OF THE ENGINE oeeeeeeeeese 19 TROUBLE SHOOTING WHEN THE ENGINE FAILS TO START 20 21 ENGINE EXPLODED VIEW 22 CARBURETTOR EXPLODED VIEW 24 O S GENUINE PARTS amp EE 25 THREE VIEW DRAWING 26 27 28 MEMO SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O S ENGINE Remember that your engine is not a toy2. Once the correct carburettor settings have been established it should be unnecessary to alter them Such slight Needle Valve readjustments as may be required to compensate for variations in atmospheric conditions will not normally affect the other two controls Slight readjustments may be necessary for optimum performance if different types of fuel glowplugs or propellers are used CARBURETTOR CLEANLINESS Proper functioning of the carburettor depends on its small fuel orifices remaining clear The minute particles of foreign matter that are present in any fuel can partially obstruct these orifices and upset mixture strength so that engine performance becomes erratic and unreliable It is recommended that fuel is passed through a filter when the tank is filled and that a good in line filter is installed between the fuel tank and carburettor and furthermore that this filter is frequently cleaned to remove dirt and lint that accumulate on the filter screen Finally occasionally remove the needle valve holder from the carburettor as shown below and extract any remaining foreign matter that may have lodged in the location shown Remove this with an CNT Gx Dirt and fibrous matter mostly accumulate here CARE AND MAINTENANCE To ensure that you obtain long life and peak performance from your engine observe the following G As previously observed foreign matter in the fuel can cause problems There
3. 5 When cleaning the exterior of the engine use me thanol or kerosene Do not use gasoline or any solvent that might damage the silicone fuel tubing or any plastic parts of the boat hull When the engine is not in use remove the glow plug and rinse out the interior with kerosene not gasoline by rotating the crankshaft Shake out re sidue then inject light machine oil through the plug hole again rotating the shaft to distribute the pro tective oil to all working parts In the event of water having entered the cylinder crankcase etc refer to the procedures recom mended in the footnote to running in section 8 Avoid unnecessary disassembly of your engine CHECKING OF THE ENGINE After a long use the engine will not develop the standard performance due to wear of parts It is suggested to replace the parts such as ball bearings connecting rod cylinder amp piston assembly and crankcase as necessary after checking when the following symptoms are found ldling gets unstable and or the engine stops at idling Engine sound changes and the engine tends to overheat Power drops extremely TROUBLE SHOOTING WHEN THE ENGINE FAILS TO START Four key points For quick reliable starting the following four conditions are required Adequate glow at glowplug Correct mixture Good compression Sufficient electric starter rotating speed If the engine fails to start or does
4. taking care not to push the crankshaft to the cover plate end INSTALLATION OF THE EXHAUST HEADER PIPE Select the screw holes according to the model 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 2 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 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 NOTES CONCERNING THE RECOIL STARTER REMINDER Do not attempt to disassemble the recoil starter 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 rel
5. for 20 to 30 metres at full throttle Now return the model and close the needle valve 20 to 30 Repeat the run taking note of the improvement in speed Continue with further runs gradually closing the needle valve 20 to 30 at a time until no further increase in speed is obtained If the needle valve is closed beyond the optimum setting the model will slow down accompanied by visibly diminished exhaust smoke In this case immediately throttle down and return the model to shore Re open the needle valve approximately one half turn and repeat the runs until the optimum needle setting is found Aim to have the model achieving its highest performance after the engine has consumed about one liter of fuel Having found the optimum needle valve setting make a note of the number of turns necessary to quart this from the closed position With the engine run in and the optimum needle valve setting determined the mixture control valve should be checked as follows 7 Launch the boat and gradually open the throttle to its fullest extent If at this point the engine puffs out a good deal of smoke and does not accelerate smoothly and rapidly it is a sign that the idling mixture is too rich Therefore turn the mixture control screw clockwise 45 to 60 Repeat the run and recheck the result 8 If on the other hand the idling mixture is too lean the engine is likely to speed up momentarily then c
6. not keep running after being started check symptoms against the following chart and take necessary corrective action Note The most common causes of trouble are marked with three asterisks the less common problems with one or two asterisks Corrective action Symptom Factor Cause F x Sluggish rotation eee Recharge the electric starter battery mnane fails R Pull the recoil starter briskly xx Glowplug battery Recharge lead acid cell or replace dry battery Note An unused discharged or almost unused dry battery may sometimes be of insufficient La capacity if it is old stock NEA x Glowplug element Replace glowplug Check that applied voltage is not too high is burned out L_x Something wrong eee Check glowplug heating using other leads x with battery leads Engine flooded Insufficient fuel EDR CE Close needle valve fully and remove glowplug Apply starter to pump out excess fuel Re start engine EE Refer to p 9 Symptom Factor Cause Corrective action Engine fires intermittently but does not run Engine fires once or twice then fails to fire Engine starts but revol utions decrease and en gine eventually stops glowplug ai Sluggish rotation gt xx x Glowplug battery discharged Engine starts then revolutions increase and engine cuts out Eng
7. OLS ACCESSORIES etc The following items are necessary for operating the engine FUEL 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 For consistent performance and long engine life it is essential to use a good quality fuel containing NOT LESS THAN 18 lubricant 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 REMINDER Model engine fuel is poisonous Do not allow it to come into contact with the eyes or mouth Always store it in a clearly marked container and out of the reach of children Model engine fuel is also highly flammable Keep it away from open flame excessive heat sources of sparks or anything else which might ignite it Do not smoke or allow anyone else to smoke near to it PROPELLER Use well balanced propellers only As the ideal diameter pitch and shape vary according to the size weight and type of model final selection can be made after practical experiment As a starting point suggested propeller diameter is 40 44mm with a pitch dia ratio of 1 0 1 6 for Vee type hulls REMINDER Never touch or allow any object to come into contact with the rotating propeller and do not crouch over the engine when it is running BATTERY INTEGRATED GLOWPLUG HEATER Commerci
8. alve Fuel Inlet Rotor Guide Screw Throttle Lever MREALIGNMENT OF MIXTURE CONTROL VALVE In the course of making carburettor 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 setting can be reestablished as follows The basic factory setting is as shown in the main sketch i e with the shoulder portion A exactly at a tangent to the throt tle rotor hole To return the Mix ture Control Valve to its original position first screw in the Mix ture Control Valve while look ing into the rotor hole Ze Then gradually unscrew the Throttle Rotor Hole Mixture Control Valve until A is precisely tangential to the rotor hole i e so that A and D are superimposed as in the main sketch Mixture Control Valve Mixture Control Screw STARTING amp INITIAL RUNNING IN Breaking in When starting the engine put the hull on a stand etc out of the water For long life and high perfomance every engine needs to be run in or broken in With care running in of the engine can be carried out with it installed in the boat Be sure to use a muffler pressurized fuel system W In case of the 21RG M Set the needle valve Turn the needle clockwise slowly without forcing until it stops Then reopen the needle valve 2 1 2turns counter clockwise T
9. aly available handy glowplug heater in which the glowplug battery and battery leads are integrated ELECTRIC STARTER AND STARTER BATTERY Use a 12 volt electric starter with suitable battery for starting the engine 21RG M FUEL PUMP For filling the fuel tank a simple poly ethylene squeeze bottle with a suit able spout is required LONG SOCKET WRENCH Recommended for easy removal and replacement of the angled and recessed glowplug the O S Long Socket Wrench incorporates a special grip SILICONE FUEL LINE This is required for the connection between the fuel tank and engine also for the o water cooling system CARBURETTOR CONTROLS Two adjustable controls are provided on this carburettor The Needle Valve When set to produce maximum power at full throt tle this establishes the basic fuel air mixture strength This is then maintained by the carburet tor s automatic mixture control system to cover the engine s requirements at reduced throttle settings The Mixture Control Valve Mixture Control Screw For adjusting the mixture strength at part throttle and idling speeds to obtain steady idling and smooth acceleration to medium speeds The Mix ture Control Valve has been factory set for the ap proximate best result First run the engine as re ceived and re adjust the Mixture Control Valve only when necessary Mixture Control Valve Mixture Control Screw Needle V
10. but a highly efficient internal combustion machine whose power is capable of harming you or others if it is misused As owner you alone are responsible for the safe operation of your engine so act with discretion and care at all times If at some future date your O S engine is acquired by another person we would respectfully request that these instructions are also passed on to its new owner Mi 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 These cover events which These cover the many other might involve serious in possibilities generally less obvious extreme circumstances even sources of danger but which under fatal injury certain circumstances may also cause damage or injury N WARNINGS pated E e Never operate your engine in an en e e ihe rotatihd Brobellerand d N closed space Model engines like auto g Prop d mobile engines exhaust deadly carbon do not crouch over the engine 8 e K monoxide Run your engine only in an when it is running open area Model engine fuel is poison ous Do notallow itto come into Model engines generate contact with the eyes or mouth considerable heat Do not Always store it in a clearly touch any part of your engine marked container and out of the until it has cooled Contact reach of children with the muffle
11. d Screw MAX 21RG M MX ENGINE PARTS LIST No Code No Description D 2 3704 100 Water Cooled Head Assembly 2 3603 000 Cylinder amp Piston Assembly 2 3906 000 Piston Pin 2 3817 000 Piston Pin Retainer 2pcs 2 3605 000 Connecting Rod 2 5382 000 Carburetor Complete Type 20J 2 3981 700 Carburetor Retainer 4 1614 000 Crankshaft Ball Bearing Front 2 3601 000 Crankcase e 2 3430 000 Crankshaft Ball Bearing Rear 23602 000 Crankshaft For RG M A 2 3602 030 Crankshaft For RG MX e 23614 000 Gasket Set 23607 000 Cover Plate 2 3813 001 Screw Set For RG M ei 2 3602 050 Starting Shaft For RG MX 2 3601 800 Rear Adaptor For RG MX 7 3003 000 Recoil Starter Assembly No 5 For RG MX 1 7 3003 100 Recoil Starter Body No 5 For RG MX 2 7 3003 200 Oneway Clutch No 5 For RG MX 2 3813 001 Screw Set For RG MX 7 1608 001 Glowplug No 8 7 1802 030 Flywheel No 2E 7 2103 520 Exhaust Header Pipe The specifications are subject to alteration for improvement without notice CARBURETTOR EXPLODED VIEW amp PARTS LIST No Code No 2 4981 405 Description Throttle Lever Assembly 2 6381 501 Set screw 2 5381 203 Carburettor Rotor 2 6781 309 Mixture Control Valv
12. e 2 4881 824 O Ring 2pcs OIDA 2 6781 506 Rotor Spring alal 2 5382 100 Carburettor Body 2 5381 220 Rotor Guide Screw Type of screw C Cap Screw M Oval Fillister Head Screw F Flat Head Screw N Round Head Screw SG Gei Screw 2 2681 953 Fuel Inlet 2 7881 900 Needle Valve Assembly 2 4981 959 Needle 8 vn lr 2 4981 837 O Ring 2pcs 2 6381 501 Set screw Ele 2 7381 940 Needle Valve Holder Assembly a amp A 2 6711 305 Ratchet Spring 29015 019 Carburettor Rubber Gasket The specifications are subject to alteration for improve ment without notice O S GENUINE PARTS amp ACCESSORIES E GLOW PLUG JOINT 4mm 22442009 9 EC No 8 71608001 A5 SJ 71605100 E MARINE UNIVERSAL W SUPER JOINT E T 2030 TUNED SILENCER TUBE 21 72106030 72106300 A la FA FA E SUPER FILTER E CRANKSHAFT 72403050 CLAMP 1521 71530200 Ln E LONG SOCKET WRENCH WITH PLUG GRIP 71521000 E LOCK WASHER M3 10sets 55500002 E DUST CAP SET 3 73300305 For carburetor nipple 8 73300812 For T 2030 tuned silencer MAX 21RG M THREE VIEW DRAWING Dimensions mm SPECIFICATIONS 4 03 3 21 W Displacement 3 46cc 0 21 1cu in H Bore 16 6mm 0 654i
13. ease the operating handle Allow the cord to rewind smoothly while still holding the handle Pull the operating handle straight out when starting the engine so that the cord does not rub against the vehicle body or engine This will help prevent the cord from being damaged by abrasion or engine heat Try to avoid spilling fuel over the starter unit and its cord Some fuels have a detrimental effect on these parts The starter prevents the engine from being rotated in the wrong direction The unit will be damaged if you attempt to force the flywheel in the opposite direction i e clockwise when viewed from the crankshaft end NOTE Because in the interests of personal safety dismantling of the starter mechanism isstrongly discouraged the Recoil Starter is available for replacement only as a pre assembled unit However some related parts such as Starting Shaft and Rear Adaptor are obtainable separately See Parts List GLOWPLUG Since the compatibility of the glowplug and fuel can have a marked effect on performance and reliability it is suggested that the user selects the R C type plug found most suitable after practical experiments Generally for a fuel containing about 30 nitromethane a medium heat range glowplug will be suitable For higher nitro fuel a cold rated plug may be required whereas for lower nitro fuel a hot rated plug may be best However the O S No 8 glowplug may be employed i
14. fore rinse out the fuel tank with methanol or fuel before installing it Install a fuel filter to the fuel delivery tube between tank and carburettor Install a fuel filter to the outlet of your squeeze bottle or to the pump inlet if you use a manual or electric pump do not leave your fuel container open needlessly x O S Super Filter L is available as optional ex tra to deal with this problem To fit this filterto the outlet tube inside your refuelling container will pre vent the entry of foreign material into the fuel tank 2 Do not forget to clean the filters regularly to remove dirt and lint that accumulate on the filter screens Also clean the carburettor itself occasionally At the end of each operating session drain out any fuel that may remain in the fuel tank Afterwards energize the glowplug and try to restart the engine to burn off any fuel that may remain inside the en gine Repeat this procedure until the engine fails to fire Leaving fuel residues within the engine can result in difficult starting after a period of storage It may also cause corrosion To reduce such risks it is helpful to inject some corrosion inhibiting oil into the engine s air intake Rotate the engine many times to distribute the oil to all the working parts Drain the water remaining in the water cooling head and wash out with methanol then inject cor rosion inhibiting or moisture displacing oil
15. ght 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 C inoperative D BASIC ENGINE PARTS Glow Plug No 8 MAX 21RG MX Water Cooled Head Carburettor KS 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 Crankcase is Glow plu N Washer o INSTALLATION OF THE CARBURETOR As delivered the engine has its carburetor lightly fitted into its intake boss Secure it as follows 1 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 2 Rotate the retainer screw gently until it stops then tighten a further 90 120 Do not overtighten the screw as this will damage the carburetor body Rotate the retainer nut gently until it stops Tighten a further 90 120 INSTALLATION OF THE FLYWEEL Insert the taper collet on the crankshaft
16. ine stops when battery leads are disconnected after starting LG xx Insufficient fuel 3 Mixture too rich 5 x Fuel not reaching the engine Mismatch of glow plug and fuel 2 Incorrect heating of r ich Excess fuel Mixture too rich ghee Voltage too high or too low Re check and readjust referring to BEFORE STARTING FREE Continue o apply starter If necessary disconnect battery from glowplug and leave for a few minutes then re energize plug If engine stil uel ere Recharge ses Recharge Note An be of insu something does not start remove glowplug and pump out excess Then re start he electric starter battery lead acid cell or replace dry battery unused or almost unused dry battery may sometimes icient capacity if it is old stock Refer to p 9 Close needle valve half turn 180 and wait for several minutes hen re start Make sure that tank is filled with fuel Check that there is not wrong with fuel tubing kinked or split Check that carburettor is not clogged with dirt lt Close the needle valve a little tenes Change fuel or glowplug MAX 21RG M MX EXPLODED VIEW ii DH C M2 6X7 C M2 6X18 F Flat Head Screw N Round Head Screw S Set Screw Type of screw C Cap Screw M Oval Fillister Hea
17. n 8 E Stroke 16 0mm 0 630in E Practical R P M 3 000 35 000r p m M Power output 1 7ps 28 000r p m E Weight 317g 11 180z MAX 21RG MX THREE VIEW DRAWING Dimensions mm SPECIFICATIONS 4033 21 M Displacement 3 46cc 0 211cu in H Bore 16 6mm 0 654in E Stroke 16 0mm 0 630in la E Practical R P M 3 000 35 000r p m E W Power output 1 7ps 28 000r p m E Weight 389g 13 720z i 33 5 L bus 74 5 MEMO UTY PRECISI o Qual ON rs GS ENGINES mr co ro 6 15 3 Chome Imagawa Higashisumiyoshi ku Osaka 546 0003 Japan TEL 06 6702 0225 FAX 06 6704 2722 URL http www os engines co jp Copyright 2001 by O S Engines Mfg Co Ltd All rights reserved Printed in Japan 090100
18. ne and never place your finger over the carburettor in take when using the starter This may cause an hydraulic lock and bend the connecting rod H In case of the 21RG MX e Take the same procedure as the 21RG M to the point of Heat the glowplug by connecting the battery leads e Pull the starter handle briskly straight out several times to start the engine Starter Handle To stop the engine fully close the throttle to cut off air supply PRECAUTIONS When starting the engine the hull is off the water and the engine is run with no load and with even below half throttle engine r p m come high Prolonged running with this condition may result in the seizure of the connecting rod and crank pin Never run the engine with high r p m never open the throttle beyond the starting setting with no load i e the hull is off the water Warm up the engine by running it at around idling setting for a while after starting As with the engine of a full size boat High r p m operation without warming up will shorten engine life or damage it lLeaving the Needle Vale set at the starting setting of 2 1 2 turns open run the boat several times with the throttle fully open until at least three full tanks of fuel have been consumed It should be noted at this stage it may not be possible for the engine to idle reliably because f the over rich setting of the Needle Valve This completes the ini
19. ottle linkage so that the engine stops when the throttle stick and trim lever on the transmitter are fully retarded Alternatively the engine may be stopped by cutting off the fuel supply Never try to stop the engine physically Warning Immediately after a glowplug ignition engine has been run and is still warm conditions sometimes exist whereby it is just possible for the engine to abruptly restart if it is rotated over compression WITHOUT the glowplug battery being reconnected e H your engine is fitted with a recoil starter pull the operating handle straight out when starting the engine so that the cord does not rub against the hull or engine This will help prevent the cord from being damaged by abrasion or engine heat 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 Do not attempt to disassemble the recoil starter if fitted If you do so the very strong spring inside will be suddenly ejected This can be very dangerous 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 MxX in corporating a recoil starter system is also available Standard accessories Glow Plug No 8 e Exhaust Header Pipe e Flywheel No2E NOTE e With this engine the piston will feel ti
20. r silencer Model engine fuel is also highly cylinder head or exhaust flammable Keep it away from header pipe in particular open flame excessive heat may result in a serious burn sources of sparks or anything else which might ignite it Do not smoke or allow anyone else to smoke near to it e This 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 manufacturers recommenda tions using appropriate screws and lock nuts Fit an effective silencer muffler Frequent close exposure to a noisy exhaust especially in the case of the most powerful high speed engines may eventually impair your hearing and such noise is also likely to cause annoyance to others over a wide area For their safety keep all onlookers especially small children well back at least 20 feet or 6 meters when preparing your model for running e Take care that the glowplug clip or battery leads do not come into contact with the propeller or any other rotating parts Also check that the linkage to the throttle arm is secure e If your engine does not have a built in recoil starter use an electric starter The wearing of safety glasses is also strongly recommended e When handling the boat immediately prior to launching be especially cautious Keep the propeller and other rotating parts away from you e Adjust the thr
21. rrespective of the nitro content of the fuel The role of the glowplug With a glowplug engine ignition is initiated by the application of a 1 5 volt power source When the battery is disconnected the heat retained within the combustion chamber remains sufficient to keep the plug filament glowing thereby continuing to keep the engine running Ignition timing is automatic under reduced 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 Glowplug life Particularly in the case of very high performance engines glowplugs must be regarded as expendable items However plug life can be extended and engine performance maintained by careful use i e Install a plug suitable for the engine Use fuel containing a moderate percentage of nitromethane unless moreis essential for racing events Do not run the engine too lean and do not leave the battery connected while adjusting needle When to replace the glowplug Apart from when actually burned out a plug may need to be replaced because it no longer delivers its best performance such as when Filament surface has roughened and turned white Filament coil has become distorted Engine tends to cut out when idling Starting qualities deteriorate Foreign matter has adhered to filament or plug body has corroded TO
22. tial running in stage For the remaining period of running in refer to the adjustment procedures detailed later The boat will need to be run or about 10 tanks of fuel to complete the running in period Note If as a result of your boat being capsized the engine takes in water remove the glowplug invert the engine and eject water by carefully turning the flywheel first by hand and then with the electric starter Make every effort to ensure that no water remains in the engine before attempting to restart it or it may be damaged by an hydraulic lock To ensure that any traces of water which may also cause internal rusting if not dealt with are flushed out use an appropriate water displacing spray lubricant ADJUSTMENT WARNING Running the engine with the boat out of the water without load and without cooling water will seri ously damage it due to overheating Therefore always lower the boat into the water immediately after the engine has been started so as to pre vent over speeding and to allow cooling water to be forced up to the cylinder head Having carried out the initial running in breaking in proce dure as described before complete the running in as follows 1 D Open the throttle slightly from the idling position and start the engine following the procedure described previously Lower the boat into the water gradually open the throttle and run the boat straight ahead
23. urn needle valve clockwise to Close close for leaner mixture Turn needle valve counterclock Q wise to open for richer mixture e Turn the flywheel by hand to draw the fuel to the fuel inlet e Turn the flywheel two more revolutions to draw the fuel inside the engine NOTE IMPORTANT The quantity of fuel drawn into the engine by priming is an important factor in starting the engine successfully When the engine is being started for the first time turn the flywheel two revolutions after fuel reaches the fuel inlet as described above However when re starting the engine immediately after a run one revolution or even no priming at all may be required The engine s requirements will be quickly learned with experience Open the throttle very slightly Priming e Open the throttle fully and place your finger over the carburetor to choke intake K 1 5 2 0nm This is to avoid unnecessarily high revolutions when the en gine starts Heat the glowplug by connecting the battery leads Make sure that the direction of rotation of the electric starter is correct namely clockwise If necessary reverse leads on battery to provide clockwise rotation Hang the starter belt over the flywheel and starter and depress the starter switch for one or two seconds Repeat if necessary When the engine fires withdraw the starter immediately Warning Do not apply the starter to a flooded engi
24. ut out abruptly when the throttle is re opened In this case first turn the mixture control screw counter clockwise 90 to make sure that the mixture has become richer then make incremental adjustments each way until an acceptable balance between rich v lean settings is achieved Carry out these adjustments patiently under actual running conditions until the engine responds quickly and positively to throttle movements Use a small screwdriver to adjust the mixture control valve via its slotted screwhead in the center of the outer end of the throttle rotor 9 With the optimum mixture control valve position light smoke is visible during high speed running and engine r p m increase smoothly during acceleration 10 Remember that if the engine is operated with the fuel air mixture slightly too lean it will overheat and run unevenly or cut out As with all engines it is wise to set both valves a little on the rich side of the best rpm setting as a safety measure When the best balance of mixture adjustments has been determined and especially as the engine becomes fully run in it will probably be found that the idling speed has increased Readjust the throttle opening by means of the trim lever on the transmitter so that the lowest idling speed without risk of stalling the engine may be obtained WARNING For safety reasons it is advisable to stop the engine before carrying out adjustments to the Mixture Control Screw Note
Download Pdf Manuals
Related Search
OS ENGINE MAX 21RG M MAX 21RG MX Manual os max engine manuals os max 19 engine