The document discusses the principles and functions of a carburetor. It explains that a carburetor mixes gasoline vapors with air for combustion in an engine. It regulates the ratio of air and fuel and controls the amount of the air-fuel mixture that enters the engine. The document then goes into detail about the different parts of a carburetor like the venturi, throttle valve, jets, chokes, and describes how they work together to supply the proper air-fuel ratio to the engine under varying operating conditions. It also covers the different types of carburetors and provides information on inspection and adjustment procedures.

1. KARBURATORKARBURATOR

2. PRINSIP KERJA KARBURATOR 1
Water
(c)
(a)
(b)
Air
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3. FUNGSI KARBURATOR 2
 MERUBAH BENSIN MENJADI PARTIKEL – PARTIKEL
BERCAMPUR DENGAN UDARA SEHINGGA MUDAH
DI SEMBURKAN
 MENGATUR PERBANDINGAN CAMPURAN UDARA DAN
BAHAN BAKAR
 MENGATUR JUMLAH CAMPURAN UDARA DAN BAHAN
BAKAR YANG MASUK KE MESIN
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4. VENTURI 3
Flow of air quickens and pressure drops
Fuel-air
mixture
Air
Atmosphere
Gasoline
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5. CAMPURAN UDARA DAN
BAHAN BAKAR 4
Fuel-air
mixture
Throttle valve
Cable
Air
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6. PERBANDINGAN UDARA – B.
BAKAR
VS BUKAAN THROTTLE VALVE
5
10 : 1
14 : 1
18 : 1 Theoretical mixture ratio
Mixtureratio
2
0
60 80 10040
Output mixture ratio
Degree to which throttle valve is open (%)
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7. PERBANDINGAN UDARA – B.
BAKAR
6
Air
Gasoline
22 g : 1 g
Lean boundary limit
Air
Gasoline
15 g : 1 g
Economical
mixture ratio
Air
Gasoline
13 g : 1 g
Maximum output
mixture ratio
Air
Gasoline
12,8 g : 1 g
Rich boundary limit
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8. JENIS KARBURATOR 7
1. BERDASARKAN ARAH ALIRAN
Horizontal draft type
Down draft type
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9. JENIS KARBURATOR 8
2. BERDASARKAN SISTEM TUAS KATUP
Opens
Closes
Throttle valve
Piston – type throttle valve
Opens
Closes
Throttle valve
Butterfly – type throttle valve
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10. JENIS KARBURATOR 9
3. BERDASARKAN JUMLAH SALURAN
Single barrels Double barrels
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11. KONSTRUKSI KARBURATOR 10
Air at idling low output
Fuel at idling low output
Fuel air mixture at idling low output
Air at medium and high speeds
Fuel at medium and high speeds
Fuel-air mixture at medium and high speeds
Jet needle
Throttle valve
Pilot outlet
Pilot air screw
Pilot jet
Main jet
Throttle stop screw
Throttle stop screw spring
Needle jet
Main air
Pilot air
Bleed air
Air jet
Needle valve
Float
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12. SISTEM CHOKE 11
Starter plunger
Secondary air
Air bleed hole
(primary air
Intake port)
Starter jet
Starter pipe
Fuel injection
port
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13. Air Fuel-air mixture
Fuel
Starter plunger needle
Starter plunger
Starter plunger holder
PTC heater
To flywhell magneto
Termowax
Spring
SISTEM CHOKE 12
Starter plunger needle
Starter plunger
Starter plunger
Starter plunger needle
Air
Fuel
CHOKE OTOMATIS
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14. PILOT SYSTEM 13
1. TIPE LUBANG TUNGGAL
Throttle valve
Pilot air screw
Pilot jet
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15. PILOT SYSTEM 14
2. TIPE LUBANG GANDA
Bypass
Pilot outlet
Pilot jet
( 1 )
Pilot jet
Pilot outlet
Bypass
( 2 )
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16. MAIN SYSTEM 15
Jet needle
Main air jet
Main jet
Needle jet
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17. MAIN SYSTEM
16
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18. MAIN SYSTEM
17
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19. TIPE MAIN JET 18
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20. POSISI KATUP GAS 19
Throttle
position
Active system
0 ~ 1/8 1/8 ~ 1/4
Pilot system Pilot system
Main system
1/4 ~ 3/4
Main system
3/4 ~ fully open
Main system
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21. TINGKAT KERJA KARBURATOR 20
Air screw & pilot jet
Throttle Valve Cut
Away
Jet Needle
Needle Jet
Main Jet
Air Jet
Primary Choke
Komp.
Karburator
Gas
Buka
Tutup
Penuh
Buka
Penuh1/8 1/4 1/2 3/4
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22. PEMERIKSAAN DAN PENYETELAN 21
Air gun
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23. PEMERIKSAAN DAN PENYETELAN
VM TYPE
22
Air screw
Throttle stop screw
Point at which speed begins to rise
Set air screw to halfway point
Point at which
Speed rises
Air screw
return amount
0
0 ½ 1½ 2½Rotationspeed
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24. PEMERIKSAAN DAN PENYETELAN
VM TYPE
23
Calipers
Lean
Rich Needle clip
1 st stage
2 st stage
3 st stage
4 st stage
5 st stage
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25. KARBURATOR GSX 250
24
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26. KARBURATOR FD 110 XCD
25
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