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2>.TROUBLESHOOllNG
ENGINE DOES NOT START OR
IS HARD TO START
ENGINE LACKS POWER
20-1
20·2
POOR PERFORMANCE AT HIGH
SPEED
POOR HANDLING
20-4
20·4
POOR PERFORMANCE AT LOW
AND IDLE SPEED
20-3
ENGINEDOESNOTSTARTORISHARDTOSTART
Possible cause
1. Check the fuel flow to carburetor
I
Reaching carburetor
t
---- Not reaching -----
carburetor
Clogged fuel line and strainer
Sticking float valve
Clogged fuel tank breather
2.
Perform
a spark test
I
Good spark
1
-------- Weak or no spark --
-
Faulty spark plug
Fouled spark plug
Faulty ignition control module
Broken or shorted spark plug wire
Faulty ignition switch
Faulty ignition pulse generator
Loose or disconnected ignition
system wires
3. Remove and inspect spark plug - ··························· Wet plug
I
Good
t
Choke valve ON position
Throttle valve open
Air cleaner dirty
4. Start by following normal procedure
I
Engine does not start
l
-- Engine starts but
stops
I m proper SE valve operation
Carburetor i n correctly adjusted
I n take pipe l e aking
I m proper ignition timing (Faulty
i g nition coil or i g nition pulse
generator)
Fuel contaminated
5. Test cylinder compression
Right side only
------ Low compression
Valve clearance too small
Valve stuck open
Worn cylinder and piston ring
Damaged cylinder head gasket
Seized valve
I m proper valve timing
20-1
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