Subaru-robin EX13 User Manual Page 60
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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12. CARBURETOR
12-1 SPECIFICATIONS
12-2 FUNCTIONS AND CONSTRUCTION
12-2-1 FLOAT SYSTEM
The float chamber is located below the carburetor body. Through the operation of the float and the needle
valve, the float chamber maintains a constant fuel level while the engine is working.
The fuel flows from the tank into the float chamber through the needle valve. When the fuel rises to a
specific level, the float rises. When the buoyancy of the float is balanced with the fuel pressure, the needle
valve shuts off the fuel passage, thereby maintaining the fuel at the predetermined level.
12-2-2 PILOT SYSTEM
The pilot system supplies fuel to the engine during idling and low-speed operation.
Fuel is initially metered by the main jet and then metered once again by the pilot jet. At the pilot jet, the fuel
is mixed with air metered by the pilot air jet and then the fuel/air mixture is fed to the engine through the pilot
outlet and the bypass. During idling, fuel is fed to the engine mainly through the pilot outlet.
12-2-3 MAIN SYSTEM
The main system feeds fuel to the engine at medium and high speed operation.
Fuel is metered by the main jet and flows into the main nozzle. Air metered by the main air jet is mixed with
fuel through the bleed holes of the main nozzle. The fuel/air mist is injected into the Venturi and mixed once
again with air from the air cleaner. This fuel/air mixture is now of optimum concentration and is fed into the
combustion chamber of the engine.
12-2-4 CHOKE SYSTEM
The choke system is for easier start of the engine in cold weather conditions.
When the engine is started with a closed choke, the negative pressure applied to the main nozzle increases.
This causes a larger amount of fuel to be drawn into the carburetor, which in turn makes it easier to start
the engine.
EX13 EX17 EX21 EX27
A/C Type STD DUAL STD DUAL STD DUAL STD DUAL
Main Jet 70.0 68.8 81.3 80.3 86.3 83.8 98.0 96.0
P
ilot Jet 40.0 40.0 40.0 40.0 41.3
←
40.0
←
P
ilot Screw Turning 1-3/4
←
1-1/4
←
1
←
1-1/2
←
- EX13,17,21,27 1
- SP170,SP210 1
- Robin America, Inc 2
- CONTENTS 3
- 1. SPECIFICATIONS 4
- 2. PERFORMANCE 5
- 2-4 PERFORMANCE CURVES 6
- 3. FEATURES 10
- Fig. 4-1 11
- Fig. 4-2 11
- Fig. 4-3 11
- Fig. 4-4 11
- 4-5 PISTON RINGS 12
- 4-7 VALVE ARRANGEMENT 12
- 4-8 CYLINDER HEAD 12
- 4-6 CAMSHAFT 12
- 4-13 IGNITION SYSTEM 13
- 4-11 LUBRICATION SYSTEM 13
- 4-10 COOLING SYSTEM 13
- 4-9 GOVERNOR SYSTEM 13
- 4-12 TIMING CHAIN 13
- Fig.4-12 14
- Fig.4-13 14
- Fig.4-14 14
- Fig.4-15 14
- Fig. 4-16 15
- Fig. 4-17 16
- Fig. 5-1 17
- Fig. 5-2 18
- Fig. 5-3 19
- Fig. 5-4 20
- FUEL PIPE 21
- Fig. 5-9 23
- Fig. 5-10 Fig. 5-11 23
- Fig. 5-8 24
- Fig.5-12 25
- Fig. 5-14a 26
- Fig. 5-13 26
- Fig. 5-14b 26
- Fig. 5-17 28
- Fig.5-19 28
- Fig.5-18b 28
- Fig.5-18a 28
- Fig.5-20 29
- Fig.5-21 29
- Fig.5-22 30
- Fig.5-23 31
- Fig.5-24 31
- Fig.5-25 31
- Fig.5-29 32
- Fig.5-30 32
- Fig.5-31 33
- Fig.5-33 33
- Fig.5-32 33
- Fig. 5-34 34
- Fig.5-35 34
- Fig.5-36 34
- Fig. 5-37 35
- Fig. 5-38a 35
- Fig.5-38b 35
- Model EX21 36
- Models EX13, 17 and 36
- 27 mounting positions 36
- Fig. 5-41a 37
- (11) MOUNTING THE TENSIONER 38
- Fig. 5-44 39
- Fig. 5-43 39
- TIMING MARK 39
- BALANCER GEAR 39
- CRANKSHAFT GEAR 39
- Intake valve side 40
- Exhaust valve side 40
- Electrode gap 0.6 mm - 0.7 mm 41
- Tightening torque 42
- 7.0 - 9.0 N・m 42
- (70 - 90 kgf・cm) 42
- (5.1 - 6.5 ft・lb.) 42
- Fig. 5-54 43
- Fig. 5-55 44
- Fig. 5-58 45
- Fig. 5-57 45
- Fig. 5-59a 46
- Fig. 5-59b 46
- Fig. 5-60 47
- Fig. 5-59c 47
- Fig. 5-62 48
- Fig. 5-61 48
- 6. ENGINE OIL 50
- 7. MAGNETO 51
- Fig. 7-1(a) 52
- Fig. 7-1(b) 52
- 7-4 IGNITION SYSTEM (EX27) 53
- Fig. 8-2 54
- Fig. 8-1 54
- Fig. 8-3 55
- Fig. 8-4 55
- ※ Oil sensor as option 55
- 9. ELECTRIC STARTER 56
- 9-3 COMPONENT PARTS 57
- (Models EX17 and EX21) 57
- (Model EX27) 57
- Fig.10-1 58
- Fig.10-2 58
- Fig.10-3 58
- Fig. 11-2 59
- Fig. 11-1 59
- 12. CARBURETOR 60
- Fig. 12-2 61
- Fig. 12-1 61
- Fig. 12-3 62
- Fig. 13-1 64
- Fig. 13-2 65
- Fig. 13-4 65
- Fig. 13-3 65
- Fig. 13-5 66
- Fig. 13-6 66
- Fig. 13-7 66
- Fig. 13-8 67
- Fig. 13-9 67
- Fig. 13-11 68
- Fig. 13-10 68
- 14. INSTALLATION 69
- 14-5-1 BELT DRIVE 70
- 14-5-2 FLEXIBLE COUPLING 70
- 15. TROUBLESHOOTING 71
- Poor output 72
- OverheatRough Idling 72
- LECTRIC STARTER 74
- KEY SWITCH 75
- RING GEAR 76
- PINION GEA 76
- 16. STANDARD REPAIR TABLES 77
- Unit: mm (in.) 78
- 16-2 TIGHTENING TORQUE 83
- 17. MAINTENANCE AND STORAGE 84
- 17-8 ENGINE STORAGE 85
- SERVICE INFORMATION 87
- 2. DESCRIPTION OF FUEL SYSTEM 91
- 3. DISASSEMBLY AND REASSEMBLY 92
- 4. WIRING DIAGRAM 97
- 5. THROTTLE BODY 98
- PULSING PRESSURE 99
- 6. INSTALLATION 101
- 7. TROUBLESHOOTING 102
- ENGINE WILL NOT START 105
- Engine does not start 105
- 8. MAINTENANCE AND STORAGE 106
- 9. ORGANIZE 108
- PRINTED IN THE USA 113
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