Husqvarna Rider ProFlex 18 Workshop Manual page 91

Ignition fault
Engine runs unevenly or lacks
power
Fuel fault
Wrong fuel used.
Fuel too old
Low octane value after long
period of storage
Replace fuel
Exhaust Dense Blue Black
Choke on
smoke:
Check choke wire and
Engine damage
choke valve
Carry out compression test
Overloading
Change operating technique
Ignition fault
Engine overheating Defective carburettor
Insufficient cooling
Heavily worn or blocked
Defective spark plug
Incorrect heating value
Incorrect contact gap
Incorrect ignition setting
Incorrect pre-ignition position
Diode fault (V-twin engine)
Replace the diode
Too little fuel in tank Fill the fuel tank
Dirty fuel filter Change the filter
Dirt in fuel pipe
Clean or replace the fuel pipe
Pinched or leaking fuel pipe
Incorrect setting
Defective carburettor
Blocked needle
Blocked air filter
Clean or replace the filter
Tank ventilator blocked Clean or replace the fuel cap
Spark plug has wrong heating
Change to right spark plug
value
Correct ignition setting
Defective pre-ignition
Diode fault (V-twin engine) Replace the diode
Incorrect setting Correct the setting
Clean the carburettor with
Partly or fully blocked needles
compressed air
and diffuser jets
Fill with right quantity and
Too low or no oil in the engine
quality of oil
Blocked cooling fins or air
Clean off dirt and leaves
intake
Change the fan and clean the
Cooling fan damaged
fan cover
Clean, adjust or replace the
plug
Change to a spark plug with
the right heating value
Check and adjust the contact
gap
Adjust the pre-ignition
Correct the carburettor setting
Clean the carburettor with
compressed air