Honda Activa SCV110, Service Manual Digest

Page: 63 / 230

5-2
FUEL SYSTEM
TORQUE VALUES
Carburetor mounting bolts 12 N·m (1.2 kgf·m, 9 lbf·ft)
TOOL
Float level gauge 070MJ – 001-I110
TROUBLESHOOTING
Engine won’t start
• No fuel in fuel tank
• No fuel to carburetor
— Fuel stainer clogged
— Fuel tube clogged
— Fuel valve vacuum tube clogged
— Float valve stuck
— Float level misadjusted
— Fuel tank cap breather hole clogged
• Too much fuel getting into the carburettor
— Air cleaner clogged
— Flooded carburetor
— Float valve wornout
— Deposition on float valve seat
— Fuel tank cap breather hole block
— Intake air leak
• Fuel cock stuck
• Bad fuel quality
• Fuel jet clogged
• Fuel contaminated/deteriorated
• By-starter valve faulty
• Ignition system faulty (section 15)
Engine stalls, hard to start, rough idling
• Fuel mixture too lean/rich
• Fuel contaminated/deteriorated
• Intake air leak
• Idle speed misadjusted
• Air screw misadjusted
• Float level misadjusted
• Carburetor clogged
• Compression too low
• Ignition system faulty (section 16)
• Flooded carburetor
• Improper carburetor tunning
• Bad quality of fuel
• Fuel tank cap breather hole block
• Air filter chocked
• Fuel line restricted
Backfiring or misfiring during acceleration
• Fuel mixture too lean
• Ignition system faulty (section 16)
• Lean mixture in slow circuit
• Faulty PAIR control valve
• Faulty PAIR check valve
• Clogged hose of the PAIR system
Lean mixture
• Fuel jets clogged
• Float valve faulty
• Float level too low
• Fuel tank cap breather hole clogged
• Fuel strainer clogged
• Fuel tube restricted
• Intake air leak
• Throttle valve faulty
• Carburettor tunning
Rich mixture
• Float valve faulty
• Choke valve in close position
• Float level too high
• Air passage clogged
• Air jets clogged
• Air cleaner contaminated
• Choke valve faulty
• Ignition timing improper