Service manual

SERVICE MANUAL - 1975 SCORPION BRUT
TROUBLE SHOOTING CHART
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TROUBLE PROBABLE CAUSE
REMEDY
FUEL RICH CONDITION
-Engine noise dull,
1.
Damage to or foreign 1.
Remove needle valve.
intermittent
obstacle under inlet
Inspect, clean or
- Spark plugs fouled.
needle valve or valve seat.
replace.
- Heavy exhaust gases
2.
Float arm bent to allow excess
2.
Adjust float arm. (See
-Malfunctioning gets
of fuel in float bowl.
ADJUSTMENTS, P. 2-11)
worse, when enrich-
ing valve is opened.
3. Air jet blocked. 3. Clean as necessary.
FUEL LEAN CONDITION
- Engine overheats.
1.
Ice or water in float bowl.
1. Drain and clean float bowl,
-Acceleration is poor.
main jet and needle jet.
2.
Dirt in jets or fuel passage.
2.
Disassemble carburetor and
- Spark plugs burn.
clean.
( '
-Engine RPM fluctu-
3. Carburetor connections leak
3.
Repair as necessary.
ates, power is low.
air.
-Condition improves,
4.
Needle jet blocked or
4.
Replace as necessary.
when enriching valve
damaged.
is opened.
5.
Impulse line leaking or
5. Repair as necessary.
pinched.
6.
Malfuncting fuel pump. 6.
Replace diaphragm or plastic
-Damaged diaphragm
-Intake check valve leaks.
valve disc(s) as necessary.
(See FIG. 2-1 0).
-Exhaust check valve leaks.
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