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42

MAX -

91FX

RING

Dimensions(mm)

Displacement 
Bore 
Stroke 
Practical R.P.M.  
Power output 
Weight

14.95 cc (0.912 cu.in.)
27.7mm (1.091 in.)
24.8mm (0.976 in.)
2,000-16,000 r.p.m.
2.8 ps / 15,000 r.p.m.
550g (19.42 oz.)

SPECIFICATIONS

25

4-   4.2

52

81.5

103

21.5

42.6

61

43.5

24.7

66.5

29.5

103.6

UNF 5/16-24

C  

Copyright 2001 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan.

60090880     061106

TEL. (06) 6702-0225

FAX. (06) 6704-2722

6-15 3-Chome Imagawa Higashisumiyoshi-ku 
Osaka 546-0003, Japan                 

UN

EQ

UA

LLE

D Q

UALITY

PRECISION & PE

RFOR

M

AN

CE

ES

TAB

LISHIN

G THE STANDARDS OF EX

CEL

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NC

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URL : http://www.os-engines.co.jp

Summary of Contents for MAX-50SX

Page 1: ...at the same time 1 CONTENTS SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O S ENGINE FEATURES OF FX SERIES ENGINES BEFORE INSTALLING THE ENGINE BASIC ENGINE PARTS NEEDLE VALVE LOCATION INSTALLATION OF...

Page 2: ...onous 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 Never operate your engine in an en closed space Model e...

Page 3: ...not cut into the blade roots and weaken them Preferably use an electric starter The wearing of safety glasses is also strongly recommended Discard any propeller which has become split cracked nicked o...

Page 4: ...his range of engines is ideally suited to a variety of R C aircraft including trainer sports aerobatic and scale types A separate precision made needle valve unit is installed at the rear where manual...

Page 5: ...sembly from upper boss of cover plate Transfer banjo type fuel inlet including washers to needle valve holder and carefully screw complete assembly into upper boss vacated by fuel inlet assembly Tight...

Page 6: ...k is fully retarded Adjustment of the throttle rotor open ing at the idling position can then be made with the throttle trim lever on the transmitter Select throttle lever and servo horn hole position...

Page 7: ...y isdisconnected theheatretainedwithinthecombustion chamber remains sufficient to keep the plug filament glowing thereby continuing to keep the engine running Ignition timing is automatic under reduce...

Page 8: ...orate and may adversely affect running qualities Once a satisfactory fuel has been selected and used for a while it may be unwise to needlessly change the brand or type In any engine a change of fuel...

Page 9: ...al glowplug connectors as shown on the right are commercially available 17 12V Battery Starter 6 Fuel tank For installation in the model a 300cc 10 6oz for 50SX and 40 46FX a 350cc 12oz for 61FX a 450...

Page 10: ...imesknown as running in or breaking in This allows the working parts to mate together under load at operating temperature Therefore it is vitally important to complete the break in before allowing the...

Page 11: ...to arrive at the optimum setting Optimum needle setting 1 Optimum needle setting 2 21 20 45 Needle valve adjustment diagram This diagram is for reference purposes only Actual needle positions may diff...

Page 12: ...0 If the mixture is excessively rich engine rpm will become unstable opening the throttle will produce a great deal of smoke and rpm may drop suddenly or the engine may stop This condition may also be...

Page 13: ...sating carburetor readjustments Note 1 2 25 CARBURETOR CLEANLINESS ENGINE CARE AND MAINTENANCE At the end of each operating session drain out any fuel that may remain in the fuel tank Next energize th...

Page 14: ...8010 27708200 46120000 26731002 25201000 26730010 25202010 25214000 25207010 25207100 24081970 24981837 26381501 46181940 46181941 26711305 46181950 22881310 22681953 25613000 71608001 25425000 226819...

Page 15: ...81940 26711305 25613000 71608001 25425000 22681957 25425310 25425400 25604010 25603010 24806301 24817100 25305002 25681010 46215000 25081700 23210007 23209003 25608000 46120000 26731002 25601100 26730...

Page 16: ...29030001 27752000 27914000 27757000 27757100 22681953 27757010 46181950 27757030 22681980 24981837 26381501 27783940 21281800 26711305 27913000 71608001 26028000 22681953 26028100 26625210 Descriptio...

Page 17: ...st Washer Crankshaft Ball Bearing F Crankcase Crankshaft Ball Bearing R Crankshaft Gasket Set Cover Plate Needle Stay Needle Valve Unit Assembly Needle Assembly O Ring 2pcs Set Screw Ratchet Spring Ne...

Page 18: ...rburetor Retaining Screw The specifications are subject to alteration for improvement without notice 35 CARBURETOR 60C 61FX 1 1 1 2 3 4 5 6 7 8 N M3 5x6 1 2 9 2 1 1 1 1 1 2 2 2 1 3 4 5 6 7 8 9 2278140...

Page 19: ...ithout notice 37 No 8 71608001 A5 71605100 For 50SX 40 46FX 73101000 73101010 1 4 28 5 16 24 50SX 40 46FX 61FX 91FX 25425600 26625340 26625500 50SX 40 46FX 873 61FX E 4010 91FX E 4020 Length 35mm 61FX...

Page 20: ...GRIP T 4010 TUNED SILENCER 79870030 79870040 50SX 40 46FX 61FX 91FX M3 M4 Size Code No Type of Engine BLIND NUTS 10pcs Sets The specifications are subject to alteration for improvement without notice...

Page 21: ...5 cc 0 455 cu in 22 0mm 0 866 in 19 6mm 0 772 in 2 500 17 000 r p m 1 62 ps 16 000 r p m 375g 13 2 oz SPECIFICATIONS Dimensions mm THREE VIEW DRAWING 17 5 44 UNF1 4 28 60 5 19 5 70 88 35 51 36 3 41 MA...

Page 22: ...ICATIONS 25 4 4 2 52 81 5 103 21 5 42 6 61 43 5 24 7 66 5 29 5 103 6 UNF 5 16 24 C Copyright 2001 by O S Engines Mfg Co Ltd All rights reserved Printed in Japan 60090880 061106 TEL 06 6702 0225 FAX 06...

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