Troubleshooting; Engine Does Not Start Or Is Hard To Start - Honda Activa SCV110 Service Manual Digest

ENGINE DOES NOT START OR IS
HARD TO START
ENGINE LACKS POWER

ENGINE DOES NOT START OR IS HARD TO START

1. Check the fuel flow to carburetor
Reaching carburetor
2. Remove and inspect spark plug
Dry plug
3. Perform spark test
Good spark
4. Test cylinder compression
Normal compression
5. Start by following normal procedure

20. TROUBLESHOOTING

POOR PERFORMANCE AT LOW AND
IDLE SPEEDS
20-1
POOR PERFORMANCE AT HIGH
20-2
SPEED
POOR HANDLING
Not reaching
carburetor
Wet plug
Weak or no spark
Low compression
Engine fires but
soon stops
Possible cause
• No fuel in fuel tank
• Clogged fuel tube/bent fuel tube
• Clogged fuel stainer
• Vaccum tube bent or disconnected
• Throttle valve excessively open
• Rich fuel mixture (section 5)
• Ignition system problem (section 16)
• Valve clearance too small
• Improper valve and seat contact
• Worn cylinder, piston and piston rings
• Valve stuck open
• Improper valve timing
• Leaking cylinder head gasket
• Loose spark plug
• Air leaking past intake pipe
• Misadjusted idle speed
• Improper ignition timing
• Improper valve clearance
• Clogged carburetor
• Fuel contaminated
• Clogged air filter
• Fuel tank cap breather hole block
20-3
20-4
20-4
20
20-1