Starting Failure/Hard Starting; Fuel System; Electrical System; Compression System - Yamaha YFM700RV 2009 Service Manual

EBS00537
NOTE:
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The following troubleshooting does not cover all the possible causes of trouble. It should be helpful,
however, as a guide to troubleshooting. Refer to the relative procedure in this manual for check,
adjustment and replacement of parts.

STARTING FAILURE/HARD STARTING

FUEL SYSTEM

Fuel tank
• Empty fuel tank
• Clogged fuel strainer
• Clogged fuel tank breather hose
• Deteriorated or contaminated fuel

ELECTRICAL SYSTEM

Spark plug
• Improper plug gap
• Worn electrodes
• Wire between terminals broken
• Improper heat range
• Faulty spark plug cap
Ignition coil
• Broken or shorted primary/secondary
• Faulty spark plug lead
• Broken body
Ignition system
• Faulty ECU
• Faulty crankshaft position sensor

COMPRESSION SYSTEM

Cylinder and cylinder head
• Loose spark plug
• Loose cylinder head or cylinder
• Broken cylinder head gasket
• Broken cylinder gasket
• Worn, damaged or seized cylinder
Valves, camshaft and crankshaft
• Improperly sealed valve
• Improperly contacted valve and valve seat
• Improper valve timing
• Broken valve spring
• Seized camshaft
• Seized crankshaft
STARTING FAILURE/HARD STARTING
TROUBLESHOOTING
Air filter
• Clogged air filter element
Switches and wiring
• Faulty main switch
• Faulty engine stop switch
• Broken or shorted wiring
• Faulty neutral switch
• Faulty start switch
• Faulty clutch switch
• Loose connections
Starter motor
• Faulty starter motor
• Faulty starter relay
• Faulty relay unit
• Faulty starter clutch
Battery
• Faulty battery
Piston and piston rings
• Improperly installed piston ring
• Worn, fatigued or broken piston ring
• Seized piston ring
• Seized or damaged piston
Crankcase and crankshaft
• Improperly seated crankcase
• Seized crankshaft
Valve train
• Improperly adjusted valve clearance
• Improperly adjusted valve timing
9 - 1
TRBL
SHTG