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FUEL SYSTEM
6C-63
cup seal fram the float bowl plastic insert for bowl
cleaning purposes. D O NOT ATTEMPT TO
R E M 0 VE PLASTIC ZNSER T.
7 . Remove fuel inlet nut, gasket, check valve filter
assembly and spring.
8. Remove throttle body by removing body to bowl
attaching screws (Fig. 6C-118).
Fig. 6C-1 18
Throttle Body
9. Remove throttle body to bowl insulator gasket (Fig.
6C- 1 19).
Throttle Body Disassembly
1. Remove pump rod from throttle lever.
2. Remove idle mixture limiter caps, screws and springs.
CLEANING AND INSPECTION
The carburetor parts should be cleaned in cold
immersion type cleaner.
C A UT I0 N: The solenoid, rubber parts, plastic
parts, diaphragms, pump plungers, should not be
put in immersion type cleaner as they will swell,
harden or distort. The bushing in the bowl will
withstand normal cleaning. Rinse thoroughly after
cleaning.
1. Thoroughly clean all metal parts and blow dry with
compressed air. Make sure all fuel passages and metering
parts are free of burrs and dirt.
2. Check, repair or replace the following parts if the
following problems were encountered.
A. Flooding
1. Inspect float needle seat for dirt, deep wear grooves,
scores and proper seating.
2. Inspect float, float arms and hinge pin for distortion,
binds and burrs. Check float for leaks and/or being loaded
(heavier than normal).
B. Hesitation
THROTILE BC
GASKCT
WELLS
Fig. 6C-1 1 9
Throttle Body Gasket
1. Inspect pump plunger for cracks, scores or excessive
cup wear. A used pump cup will shrink when dry. Soak in
fuel for 8 hrs. before testing if dried out.
2. Inspect pump duration and return spring for being
weak o r distorted.
3. Check for dirt in pump passages and jets, improper
seating of inlet o r discharge balls, and scores in pump well.
4. Check pump linkage for excessive w e a s repair o r
replace as necessary.
C. Hard Starting
-
Poor Cold Operation
1. Check choke valve and linkage for excessive wear,
binds o r distortion.
2. Inspect choke vacuum diaphragms for leaks.
3. Clean or replace carburetor filter.
4. Inspect inlet needle for sticking, dirt, etc.
5. Examine fast idle cam for wear or damage.
6. Also check items under "flooding".
D. Poor Performance
-
Poor Gas Mileage
1. Check power piston, and metering rods for dirt,
sticking, binding, damaged parts or excessive wear.
2. Clean all fuel and vacuum passages in castings.
E. Rough Idle
1. Inspect idle needle for ridges, burrs or being bent.
2. Inspect gasket mating surfaces on castings for damage
to sealing beads, nicks and other damage.
3. Clean all idle fuel passages.
4. Check throttle lever and valves for binds, nicks and
other damage.
CARBURETOR ASSEMBLY
Throttle Body
1. If removed, install idle mixture needles and springs
until seated. Back out the mixture needles three turns as a
preliminary idle adjustment. Final adjustment must be made
on the engine using the procedures described under idle
mixture adjustment.
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