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Fuel System
Problem: Carburetor
C~:mdition
Remedy
(0·1/4 Opening)
A.
Too Rich
1. Plunger wi
ll
not seat
1.
Adjust
-
service
-
replace
choke cable
-
plunger assembly
2. Pilot air screw too far
in
2.
Adjust pi lot air screw
3.
Pilot air passage obstructed
-
3. Remove obstruction
-
replace
damaged
pilot
air screw
-
carburetor
4. Floatlinlet need le obstructed
-
4. Remove obstruction
-
rep lace
damaged
-
adjusted
incorrectly
inlet
needle
- floa
t
-
adjust
float tab
5. Pi lot jet loose
5. Tighten pilot
jet
B. Too Lean
1. Plunger rema
in
s seated
1. Adjust
-
service
-
choke
cable
-
plunger
as
sembly
2.
Pil
ot air screw too far
out-
2. Adjust
-
replace pilot air
damaged
screw
3. Thrott le valve sticks open
-
3. Service-
rep lace thrott le valve
-
damaged
-
worn
.
throttle
cable-
spring
4. Pi lot outlet obstructed
4. Remove obstruction
5.
Float/inlet needle obstructed
-
5. Remove
obstruction
-
replace
damaged
-
adjusted incorrectly
inl
et need
le-
float
-
adjust
float tab
Problem: Carburetor
Condition
Remedy
(1/4·3/4 Opening)
)
A. Too Rich
1.
Pilot air screw too far
in
1. Adjust pilot air screw
2.
Needle
jet
-
jet
needle
worn
-
2. Replace
-
adj
ust needle
jet
-
adjusted
incorrectly-
incorrect
rep lace
jet needle
3. Pi lot air passage obstructed
-
3. Remove obstruction
-
replace
damaged
pilot air
screw-
carburetor
4.
Pi
lot jet
loose
4.
Tighten pi lot
jet
5. Floatlinlet
needle
obstructed
-
5. Remove obstruction
-
replace
damaged
-
adjusted incorrect ly
inlet needle
-
float
-
adjust
float tab
6. Main
jet
loose
-
too large
6. Tighten
-
replace main
jet
7. Primary air passage obstructed
7.
Remove obstruction
B. Too
Lea
n
1. Pilot air screw too far out
-
1. Adjust
-
replace pi lot air screw
damaged
2.
Needle
jet
obstructed
2. Remove obstruction
3. Pilot
outlet-
main jet
3. Remove obstruction
obstructed
4. Float/inlet needle obstructed
-
4. Remove obstruction
-
replace
damaged
-
adjusted
incorrectly
inlet needle
-
flo
a
t
-
adjust
float tab
Problem: Carburetor (3/4
Condition
Remedy
-
WOT Opening)
A. Too Rich
1. Main
jet
loose
-
too large
1. Tighten
-
replace with smaller
main jet
2.
Floatlinlet needle obstructed
-
2. Remove obstruction
-
replace
damaged
-
adjusted incorrectly
inlet
needle- floa
t
-
adjust
float tab
3. Needle jet
-
jet
needle
worn
-
3. Replace
-
adjust needle
jet
-
adjusted
incorrectly
-
incorrect
replace jet
needle
178
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