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When the engine is not to be used for some months
(for example, as between flying seasons), a worthwhile
precaution is to remove it from the airframe and, after
washing off the exterior with alcohol (not gasoline nor
kerosene), remove carefully the carburetor with intake
pipe, glow plug and all silicone tubing and put them
safely aside. Then, immerse the engine in a container
of alcohol. Rotate the crankshaft while the engine is
immersed. If foreign matter is visible in the alcohol,
rinse the engine again in clean alcohol. Finally, shake
off and dry the alcohol, and inject some after-run oil in
the glowplug hole and rotate the crankshaft several
times by hand. Reinstall the carburetor with intake pipe
and glowplug on the engine and keep it in a dry place
after putting in a vinyl bag.
O.S. GENUINE PARTS & ACCESSORIES
GLOWPLUG
No.7
(71607100)
No.8
(71608001)
No.10 (Former A5)
(71605100)
POWERBOOST PIPE 55
(72147000)
POWERBOOST PIPE 55
(72144000)
CRANKSHAFT CLAMP
3246
(71530400)
NON-BUBBLE WEIGHT
(71531000)
NON-BUBBLE WEIGHT
(S)
(71531010)
( L )
SUPER FILTER
(72403050)
LOCK WASHER (10set)
(55500002)
M3
O.S. SPEED SILICONE FUEL LINE
(72506100)
2.5mm x 1000mm
O.S. SPEED PLUG WRENCH
(71520100)
The specifications are subject to alteration for improvement without notice.
ENGINE EXPLODED VIEW & PARTS LIST
C.M3x15
1
1-1
2
3
5
4
6
7
8
C.M2.6x18
14
11
10
9
12-1
13
12
CARBURETOR EXPLODED VIEW & PARTS LIST
C.M3x8
1-1
1
3
2
3-1
5
C.M2.6x7
10
6
4-3
7
8
4-2
11-4
11-2
11-3
11-1
12
11
4
THREE VIEW DRAWING
Dimensions (mm)
SPECIFICATIONS
Displacement
8.93 cc / 0.55 cu.in.
Bore
23 mm / 0.91 in.
Stroke
21.5 mm / 0.85 in.
Output
2.1 ps / 2.07 hp / 17,000 r.p.m.
Practical R.P.M.
2,000-20,000 r.p.m.
Weight
(Engine)
408g / 14.40 oz.
38
47
36
52
No.
1
25804000
25804160
1-1
2
25803100
Type of screw
27703400
C...Cap Screw
3
4
25803200
25806000
5
6
25217000
25205000
7
8
25881000
23210007
9
18
10
46120000
26731002
11
12
25881700
45566310
12-1
13
25801000
25830000
14
15
25802000
16
25804170
17
25807001
18
25613000
15
71608001
The specifications are subject to alteration for improvement without notice.
CAP SCREW SETS ( 10pcs./sets )
C.M3x8
Code No.
79871055 M2.6x18
17
16
No.
Code No.
1
29085140
1-1
22826131
Type of screw
2
25881200
C...Cap Screw
3
25881220
3-1
79871020
4
29085510
4-1
27881810
4-2
27881800
4-3
27881820
5
45581820
6
25881100
9
7
27881330
8
27681340
9-1
9-3
9
29085900
9-1
29085910
9-4
9-2
24981837
9-2
9-3
29085940
9-4
26711305
10
29085950
11
27981900
4-1
11-1
27981910
11-2
24981837
11-3
27381940
11-4
26711305
12
29015019
The specifications are subject to alteration for improvement without notice.
31
UNF1/4-28
51.6
C
Copyright 2013 by O.S. Engine Mfg. Co., Ltd. All rights reserved. Printed in CHINA.
Code No.
Description
Heatsink Head
Head Gasket (0.2mm)
Cylinder Liner
Piston Ring
Piston
Piston Pin
Piston Pin Retainer (2pcs.)
Connecting Rod
Carburetor Complete 40L
Propeller Nut
Thrust Washer
Crankshaft Ball Bearing (Front)
Carburetor Retainer Assembly
"O" Ring
Crankcase
Crankshaft Ball Bearing (Rear)
Crankshaft
Cover Gasket
Cover Plate
Screw Set
Glow Plug No.8
Size
Pcs. used in an engine
Retainer Screw (1pc.)
Description
Throttle Lever Assembly
Throttle Lever Retaining Screw (2pcs.)
Carburetor Rotor
Rotor Guide Washer
Rotor Guide Washer Retaining Screw
Mixture Control Valve Assembly
"O"Ring (L) (2pcs.)
"O"Ring (S) (2pcs.)
"O"Ring (2pcs.)
Rotor Guide Screw
Carburetor Body
Mixture Control Screw
Mixture Control Valve Stopper
Needle Valve Assembly (Main Needle)
Needle Assembly
"O"Ring (2pcs.)
Needle Valve Holder Assembly
Ratchet Spring
Fuel Inlet
Needle Valve Assembly
Needle Assembly
"O"Ring (2pcs.)
Needle Valve Holder Assembly
Ratchet Spring
Carburetor Rubber Gasket
17.5
51.6
54
37
25
6-15 3-Chome Imagawa Higashisumiyoshi-ku
Osaka 546-0003, Japan TEL. (06) 6702-0225
FAX. (06) 6704-2722
http://www.os-engines.co.jp
121402
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