Keihin One-Barrel Carburetor Components
N
K
M
L
J
I
P
H
G
E
F
D
B
C
A
R
W
O
V
U
T
S
S
Q
A
Carburetor Upper
Body (Choke)
B Self-relieving Choke
C
Body Gasket (Formed
Rubber)
D Slow Speed Jet
E Inlet Needle Valve F Clip
G Float Pin H Float Assembly
I
Carburetor Lower
Body (Throttle)
J Main Jet
K
Idle Fuel Adjusting
Needle
L Solenoid Seat
M Fuel Shut-off Solenoid N
Idle Speed Adjusting
Screw
O
Jet (Accelerator Pump
Carburetor only)
P
Accelerator Pump
Cover
Q Diaphragm R Diaphragm Spring
S O-Ring T Rubber Boot
U Bushing V Return Spring
W Accelerator Pump
Engines in this series are equipped with Keihin xed
main jet carburetors. CH18-740 engines use a one-
barrel carburetor. Most applications use a fuel shut-off
solenoid installed in place of fuel bowl retaining screw,
and also contain an accelerator pump. All carburetors
feature a self-relieving choke. CH750 engines use
a Keihin two-barrel carburetor on a matching intake
manifold.
Troubleshooting Checklist
When engine starts hard, runs roughly or stalls at low
idle speed, check following areas before adjusting or
disassembling carburetor.
1. Make sure fuel tank is lled with clean, fresh
gasoline.
2. Make sure fuel tank cap vent is not blocked and that
it is operating properly.
3. Make sure fuel is reaching carburetor. This includes
checking fuel shut-off valve, fuel tank lter screen,
in-line fuel lter, fuel lines and fuel pump for
restrictions or faulty components as necessary.
4. Make sure air cleaner base and carburetor are
securely fastened to engine using gaskets in good
condition.
5. Make sure air cleaner element (including precleaner
if equipped) is clean and all air cleaner components
are fastened securely.
6. Make sure ignition system, governor system,
exhaust system, and throttle and choke controls are
operating properly.
Fuel System
2524 690 06 Rev. J KohlerEngines.com
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