Troubleshooting; Engine Does Not Start Or Is Hard To Start - Honda CH250 Elite 1986 Service Manual

19. TROUBLESHOOTING
ENGINE DOES NOT START OR
IS HARD TO START
ENGINE LACKS
POWER
POOR PERFORMANCE AT LOW
AND IDLE SPEEDS
POOR PERFORMANCE AT HIGH
SPEED
ENGINE NOISE
CLUTCH, DRIVE AND DRIVEN
PULLEYS 19-4
HANDLING
POOR SUSPENSION PERFORMANCE
POOR BRAKE PERFORMANCE
FUEL GAUGE
STARTER MOTOR
DIGITAL SPEEDOMETER
MALFUNCTIONS
19-5
19-5
19-5
19-6
19-7
ENGINE DOES NOT START OR IS HARD TO START
Probable cause
1. Check for fuel at the
carburetor by looSElnllng drain screw
FUEL TO CARBURETOR
2. spark tElst
SPARK JUMPS
1
3. Test cylinder cornpression
NORMAL COMPRESSION
1
4. Start by following normal
starting procedure
ENGINE
DOES FIRE
+
5. Remove the
NO FUEL TO - - - - - - - - - .. (1) No fuel in tank
CARBURETOR
(2)
Clogged fuel tube to
carburetor, vacuum tube
to intake pipe
(3)
Clogged .fuel valve
(4)
Clogged float valve
(5)
Clogged fuel tank cap
breather hole
(6)
Clogged fuel filter
(7)
Clogged fuel strainer
WEAK OR NO SPARK------l....... ll) Faulty spark plug
(2)
Fouled spark plug
(3)
Faulty COl unit
(4)
Faulty generator
(5)
Broken or shorted spark plug
(6)
Broken or shorted ignition coil
(7)
Faulty ignitionswitch
LOW
CO'Mf'RESSjIOl\I~------(1)
Valve clearance small
(2)
Improper valve and seat contact
(3)
Worn cylinder and piston rings
(4)
Valve stuck open
(5)
Seized valve
(6)
Improper valve timing
(7)
Leaking cylinder head gasket
ENGINE FIRES B U T - - - - - - - l....... (1) Faulty auto bystarter
SOON STOPS
(2)
Intake pipe leaking
(3)
Improper. ignition timing
(4)
Incorrectly adjusted pilot screw
WET PLUG
---------_1IIr
(1) Flooded carburetor
(2) Faulty auto bystarter
(3) Throttle valve open excessively
(4) Dirty air cleaner
19-1
Dl