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Once the optimum needle-valve setting has been 
established (see "Needle-valve adjustment-
Summary") the procedure for starting is simplified as 
follows:
1) Open the needle-valve one half-turn (180˚) from 

the optimum setting.

2) Open the throttle fully, place your finger over the 

carburettor intake and rotate the propeller through 
two revolutions to prime the engine.

3) Set the throttle one-third open from the fully closed 

position, energize the glowplug and apply the 
starter. When the engine starts, re-open the 
throttle and re-adjust the needle-valve to the 
optimum setting.

19

  How to stop the engine

Close the throttle to reduce to the lowest possible r.p.m.

Close

With the transmitter throttle trim lever fully retarded, adjust the 
throttle servo linkage so that the throttle rotor is fully closed 
(i.e.engine stopped) when the stick is fully retarded.

Subsequent starting procedure

18

Note:  When re-starting the engine on the same 
day, provided that atmospheric conditions have 
not changed significantly, it may be practicable to 
re-start the engine on its optimum (running) 
setting. Also, if the engine is being re-started 
immediately after a run (i.e.hot), priming should 
not be necessary.

22

Summary of Contents for MAX-25LA

Page 1: ...ntained 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 plac...

Page 2: ...RUNNING IN Breaking in TROUBLE SHOOTING WHEN THE ENGINE FAILS TO START CARE AND MAINTENANCE OPTIONAL PARTS ACCESSORIES 10LA ENGINE EXPLODED VIEW PARTS LIST 15 25LA ENGINE EXPLODED VIEW PARTS LIST CAR...

Page 3: ...would respectfully request that these instructions are also passed on to its new owner SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O S ENGINE The advice which follows is grouped under two headings ac...

Page 4: ...head or exhaust header pipe in particular may result in a serious burn Never touch or allow any object to come into contact with the rotating propeller and do not crouch over the engine when it is run...

Page 5: ...earing Such noise is also likely to cause annoyance to others over a wide area Fit a top quality propeller of the diameter and pitch specified for the engine and aircraft Locate the propeller on the s...

Page 6: ...e wearing of safety glasses is also strongly recommended Discard any propeller which has become split cracked nicked or otherwise rendered unsafe Never attempt to repair such a propeller destroy it Do...

Page 7: ...sand The propeller may throw such material in your face and eyes and cause injury For their safety keep all onlookers especially small children well back at least 20 feet or 6 meters when preparing yo...

Page 8: ...ghly skilled craftsmen and technicians are combined to ensure a continuation of the levels of performance durability and reliability for which O S is world famous The midnight blue external finish may...

Page 9: ...Side view Top surfaces are in the same plane Re align the surfaces as necessary INCORRECT Top surfaces are not in the same plane Opposite beam Top surfaces are not in the same plane Engine does not r...

Page 10: ...rotated to any desired position in the following manner 1 Loosen the locknut and assembly screw 2 Set the exhaust outlet at the required position by rotating the rear part of the silencer 3 Re tighte...

Page 11: ...lt rechargeable lead acid cell accumulator 1 5 volt heavy duty dry battery or 2 volt rechargeable lead acid cell at least 5Ah If a 2 volt cell is employed use a resistance wire as shown to reduce appl...

Page 12: ...ent from the battery to the glowplug Basically two leads with clips are required but for greater convenience twin leads with special glowplug connectors as shown on the right are commercially availabl...

Page 13: ...s shown left Fuel Use a good quality commercial fuel or one of the blends shown in the table Fuel A is suitable for running in and ordinaryuse Fuel B isforusewhenmorepowerisrequired and for improved f...

Page 14: ...r practical experiment Trainer Sport LA Series 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 Running in Reminder...

Page 15: ...NE Preparations 1 Installing the glowplug Install washer on the glowplug and insert carefully into cylinder head making sure that it is not crossthreaded before tightening firmly Glow plug Washer 2 In...

Page 16: ...after compression is felt Compression is first felt around this posi tion when turning the propeller slowly Dribble a few drops of fuel around the glowplug and look for air bubbles If leakage is detec...

Page 17: ...d Place your finger over the carburettor to choke intake Turn the propeller two revolutions while watching fuel line 5 Opening and closing of the needle valve 6 Setting the needle valve Turn needle va...

Page 18: ...ng started for the first time turn the propeller 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...

Page 19: ...at it cannot move forward when the engine starts Be careful not to be hit by propeller Glowplug battery Place as far to the rear as possible Fully opened position Fully closed position Set at this Pos...

Page 20: ...to the cylinder and result in hydraulic lock that may damage the engine BEWARE of the rotating propeller 14 Engine starts If the engine does not start refer to the TROUBLE SHOOTING CHART on page 26 27...

Page 21: ...eard Key to the needle valve adjustment Turn 10 15 at a time Turn the needle valve 10 15 in the direction of arrow and wait momentarily for the change of r p m After the rpm of the engine is increased...

Page 22: ...es only Actual needle positions may differ from those shown On starting from cold with the needle valve set at the rich starting position Take note of this position of the needle valve This will produ...

Page 23: ...ts re open the throttle and re adjust the needle valve to the optimum setting 19 How to stop the engine Close the throttle to reduce to the lowest possible r p m Close With the transmitter throttle tr...

Page 24: ...surroundings 2 Now fly the model with the needle valve re set 20 30 degrees open from the optimum setting i e 40 60 from the highest rpm setting 3 Close the needle valve very slightly on successive f...

Page 25: ...e engine stop Apply full throttle Does the engine regain full power immediately OK Refer to the CARBURETTOR AIR BLEED ADJUSTMENT section on page 25 Re set the idling position at a little higher r p m...

Page 26: ...ain Stop the engine Stop the engine Note Stop engine by pinching fuel delivery tube Do not touch needle valve Open air bleed screw Half turn at a time Close air bleed screw Half turn at a time Pre Fli...

Page 27: ...cedure referring to 8 Priming Sluggish rotation Glowplug battery discharged Glowplug element is burned out Something wrong with battery leads Engine flooded due to excessive priming Insufficient primi...

Page 28: ...Repeat priming procedure referring to 8 Priming Close needle valve half turn 180 and wait for several minutes then re start Priming is not necessary Make sure that tank is filled with fuel Check that...

Page 29: ...gine at the conclusion of a flying session it may cause corrosion The best practice is to disconnect the fuel line from the carburettor while the engine is running Remaining fuel in the tank should al...

Page 30: ...LA 23024008 for 25LA EXHAUST ADAPTORS SPINNER NUT LONG PROPELLER NUT SET NON BUBBLE WEIGHT SUPER FILTER L SILENCER EXTENSION ADAPTORS GLOW PLUG LONG SOCKET WRENCH WITH PLUG GRIP 73101000 for 25LA 7240...

Page 31: ...Type of screw C Cap Screw M Oval Fillister Head Screw F Flat Head Screw N Round Head Screw S Set Screw EXPLODED VIEW MAX 10LA 1 2 3 3 1 4 5 6 7 8 9 0 1 2 q M M2 6X7 S 3X3 M M2 6X10 30...

Page 32: ...er Crankcase Crankshaft Cover Plate Needle O Ring Set Screw Head Gasket Screw Set Glow Plug A3 871 Silencer Pressure Fitting Assembly Screw Retaining Screw N M2 6X25 2pcs Description Code No 2 1004 00...

Page 33: ...C Cap Screw M Oval Fillister Head Screw F Flat Head Screw N Round Head Screw S Set Screw w q 0 5 4 3 1 2 5 1 5 2 3 5 4 2 1 N M3X12 25LA N M3 5X5 B M2 6X8 S 3X3 M M2 6X10 15LA 9 8 7 6 EXPLODED VIEW MAX...

Page 34: ...081970 22564000 22563000 22325020 22625404 1 2 3 4 5 1 5 2 6 7 8 9 0 1 2 3 4 5 q w Cylinder Head Cylinder Piston Assembly Piston Pin Connecting Rod Carburettor Complete 10G Carburettor Complete 20H Ca...

Page 35: ...83100 21783300 21015001 Throttle Lever Assembly Throttle Lever Fixing Screw Carburettor Rotor Air bleed Screw Carburettor Body Throttle Stop Screw Carburettor Gasket Carburettor Retaining Screw Descri...

Page 36: ...cal R P M Power output Weight 1 76 cc 0 107 cu in 13 44mm 0 529 in 12 4mm 0 488 in 2 500 18 000 r p m 0 27 bhp 17 000 r p m 112g 3 95 oz 10LA SPECIFICATIONS Dimensions mm 23 38 6 11 7 44 3 27 5 2 2 8...

Page 37: ...bhp 15 000 r p m 197g 6 94 oz 25LA SPECIFICATIONS Displacement Bore Stroke Practical R P M Power output Weight 2 49 cc 0 1517 cu in 15 2mm 0 598 in 13 7mm 0 539 in 2 500 18 000 r p m 0 41 bhp 17 000 r...

Page 38: ...Co Ltd All rights reserved Printed in Japan U N EQUALLED QUALITY PRECISION PERFORMAN C E ESTABLISHING THE STANDARDS OF EXCELLENC E 110101 TEL 06 6702 0225 FAX 06 6704 2722 6 15 3 Chome Imagawa Higash...

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