Dimensions (mm)
THREE VIEW DRAWING
ENGINE EXPLODED VIEW & PARTS LIST
Type of screw
C…Cap Screw
The specifications are subject to alteration for improvement without notice.
CARBURETOR EXPLODED VIEW & PARTS LIST
(55500002)
(71605100)
(71608001)
(71607100)
C
121402
Copyright 2013 by O.S. Engine Mfg. Co., Ltd. All rights reserved. Printed in CHINA.
http://www.os-engines.co.jp
6-15 3-Chome Imagawa Higashisumiyoshi-ku
Osaka 546-0003, Japan
TEL. (06) 6702-0225
FAX. (06) 6704-2722
O.S. GENUINE PARTS & ACCESSORIES
(72403050)
(71531000)
(L)
NON-BUBBLE WEIGHT
SUPER FILTER
M3
LOCK WASHER (10set)
GLOWPLUG
No.10 (Former A5)
No.8
No.7
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.
POWERBOOST PIPE 55
POWERBOOST PIPE 55
3246
CRANKSHAFT CLAMP
(71531010)
(S)
NON-BUBBLE WEIGHT
(71520100)
O.S. SPEED PLUG WRENCH
The specifications are subject to alteration for improvement without notice.
Type of screw
C…Cap Screw
The specifications are subject to alteration for improvement without notice.
(71530400)
(72144000)
(72147000)
3
4-1
4-2
4-3
4
5
6
7
8
9-1
9-2
9-3
9-4
9
11-1
11-2
11-3
11-4
10
3-1
12
C.M2.6x7
2
C.M3x8
1
1-1
11
8.93 cc / 0.55 cu.in.
23 mm / 0.91 in.
21.5 mm / 0.85 in.
2.1 ps / 2.07 hp / 17,000 r.p.m.
2,000-20,000 r.p.m.
408g / 14.40 oz.
79871055 M2.6x18
CAP SCREW SETS (10pcs./sets)
Code No.
Size
Pcs. used in an engine
Retainer Screw (1pc.)
1
1-1
2
3
4
5
6
7
8
9
10
11
12
12-1
13
14
15
16
17
18
25804000
25804160
25803100
27703400
25803200
25806000
25217000
25205000
25881000
23210007
46120000
26731002
25881700
45566310
25801000
25830000
25802000
25804170
25807001
25613000
71608001
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
No.
Description
Code No.
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
(72506100)
2.5mm x 1000mm
O.S. SPEED SILICONE FUEL LINE
C.M3x15
1
2
3
4
5
6
7
8
9
10
11
12
14
15
18
13 12-1
C.M2.6x18
C.M3x8
16
17
1-1
37.7
11.5
37
31
51.6
44
17.5
UNF1/4-28
18.3
51.6
25
72.6
54
52
36
38
47
1
1-1
2
3
3-1
4
4-1
4-2
4-3
5
6
7
8
9
9-1
9-2
9-3
9-4
10
11
11-1
11-2
11-3
11-4
12
29085140
22826131
25881200
25881220
79871020
29085510
27881810
27881800
27881820
45581820
25881100
27881330
27681340
29085900
29085910
24981837
29085940
26711305
29085950
27981900
27981910
24981837
27381940
26711305
29015019
No.
Description
Code No.
Displacement
Bore
Stroke
Output
Practical R.P.M.
Weight
(Engine)
SPECIFICATIONS
