Troubleshooting; Engine Does Not Start Or Is Hard To Start - Honda VTR1000F Service Manual

21.
TROUBLESHOOTING
ENGINE DOES NOT START OR IS
HARD TO START
POOR PERFORMANCE AT HIGH SPEED 21-4
21-1
POOR HANDLING
21-4
ENGINE LACKS POWER 21-2
POOR PERFORMANCE AT LOW AND
IDLE SPEED 21-3
ENGINE DOES NOT START OR IS HARD TO START
Possible cause
1. Check fuel flow to carburetor - - - - - Not reaching carburetor
- - - t ..
~.
Clogged fuel line and strainer
I •
Clogged fuel valve vacuum tube
Reaching carburetor • Clogged fuel tank breather tube
~
2. Perform spark test - - - - - - - - - Weak or no spark
------< .. -.
Faulty spark plug
I •
Fouled spark plug
Good spark
.0
Loose or disconnected ignition sys-
tem wires
• Broken or shorted spark plug wire
• Faulty ignition pulse generator
• Faulty ignition coil
• Faulty engine stop switch
• Faulty ignition control module (lCM)
• Faulty converter unit
• Faulty ignition switch
3. Remove and inspect spark plugs - - - - Wet plug - - - - - - - - - ... Flooded carburetor
I •
Starting enrichment (SE) valve ON
Good condition position (open)
j
·
Throttle valve open
• Dirty air cleaner
4. Start by following normal procedure - - - Engine starts but stops
--~--.
Improper choke operation
I •
Incorrectly adjusted carburetor
Engine does not start • Leaking carburetor insulator
I
·
Improper ignition timing (Faulty ICM
or ignition pulse generator)
• Contaminated fuel
5. Test cylinder compression-n------ Low compression
------<--.
Valve stuck open
• Worn cylinder and piston rings
II
• Damaged cylinder head gasket
• Seized valve
• Improper valve timing
21-1