TROUBLESHOOTING
ENGINE IS HARD TO START OR SOON STOPS
POSSIBLE CAUSE
1. Drain and check fuel flow to carbure-
tor
I
REACHING CARBURETOR
2.
Try to start with choke ON
I
DOES NOT START
3.
cJeck spark plug
I
NO PROBLEM
NOT REACHING CARBURETOR------t...•
Clogged fuel line or fuel filter/
strainer
•
Clogged fuel tank breather hole
•
Loose or disconnected fuel pump
and relay wire
Faulty fuel pump relay
Faulty fuel pump
Faulty float
Clogged carburetor body
ENGINE STARTS-----------i ...• Clogged carburetor jets
WET P L U G - - - - - - - - - - -...-·
Dirty air cleaner
Loose spark plug
Mixture too rich
Carburetor flooded
Choke valve stuck open
Dirty air cleaner element
Cylinder flooded
Improper spark plug
WEAK OR NO SPARK-------.·
Refer to page 16-2
(ONE CYLINDER)
LOW COMPRESSION---------i . ..•
Improper valve and seat contact
Damaged cylinder head gasket
Valve stuck open
Worn cylinder and piston rings
4.
Spark test both cylinders
I
NO PROBLEM
5.
J,
"Ii"d" <omp,,,,;o" ,,;",
compression gauge
I
NO PROBLEM
6.
cJeck valve train
NO G O O D - - - - - - - - - - - - - . ·
Valve clearance too small
I
•
Improper valve timing
COMPRESSION NORMAL
Worn camshaft
I
Loose valve adjuster and lock nut
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - . .
Improper ignition timing
(Faulty pulse rotor or generator with
ferrous burrs)
• Clogged carburetor passage or jets
20-2