Engine Troubleshooting - Husqvarna NUDA 900 R 2012 Workshop Manual

NUDA 900 2012/2013 - NUDA 900 R 2012/2013
ENGINE
Trouble
Starter motor does not operate or does not
turn engine over
Engine turns over but does not start engine
or starts hard
Manuale d'officina Ed. 11-2011
TROUBLESHOOTING
Possible causes
Ignition switch not in ON position
Engine-stop-switch on OFF position
Discharged battery, loose or corroded
connections
Ignition circuit in short-circuit
Starter motor defect
Spark plugs loose
Spark plugs not according to specifications
or defective
Spark plugs fouled or wet
Battery nearly discharged, starting rpm
too low
Fuel supply inadequate
Valve clearance below specification
Valve timing incorrect
Ignition coil or ignition cable defective
Ignition unit defective, ignition timing in-
correct
Cylinder gasket defective
Valves and valve guides worn or imperfect
valve seat
Piston rings and/or cylinder bore worn
Engine oil too heavy (winter operation)
C.2
Remedy
Switch ignition switch to position ON
Switch to position ON
Check/replace battery and check connec-
tions, check charging system
Check ignition circuit
Replace starter motor
Tighten spark plugs
Replace spark plug
Clean or exchange
Check/replace battery and check con-
nections, check if battery is charged by
generator
Check fuel tank if empty
Check / replace fuel filter, fuel supply pi-
pes, fuel pump, fuel pressure sensor and
injectors
Adjust valve clearance according to spe-
cification
Adjust position of camshaft gears
Check / replace
Check / replace crank position trigger and
ECU
Exchange cylinder head gasket
Exchange valves, rework valve seats or
exchange cylinder head
Exchange piston rings and/or cylinder
Exchange engine oil