Husqvarna Rider 13C Workshop Manual

Also see for 11 C: Operator's manual

Engine runs unevenly or lackspowerIgnition faultDefective spark plugIncorrect ignition settingDiode fault (V-twin engine)Replace the diodeHeavily worn or blockedIncorrect heating valueIncorrect contact gapIncorrect pre-ignition positionClean, adjust or replace theplugChange to a spark plug withthe right heating valueCheck and adjust the contactgapAdjust the pre-ignitionFuel faultToo little fuel in tankDirty fuel filterDirt in fuel pipePinched or leaking fuel pipeDefective carburettorBlocked air filterTank ventilator blockedFill the fuel tankChange the filterClean or replace the fuel pipeIncorrect settingBlocked needleClean or replace the filterClean or replace the fuel capCorrect the carburettor settingClean the carburettor withcompressed airIgnition faultSpark plug has wrong heatingvalueDefective pre-ignitionDiode fault (V-twin engine)Change to right spark plugCorrect ignition settingReplace the diodeWrong fuel used.Fuel too oldLow octane value after longperiod of storageReplace fuelOverloadingChange operating techniqueEngine overheating Defective carburettorInsufficient coolingIncorrect settingPartly or fully blocked needlesand diffuser jetsToo low or no oil in the engineBlocked cooling fins or airintakeCooling fan damagedCorrect the settingClean the carburettor withcompressed airFill with right quantity andquality of oilClean off dirt and leavesChange the fan and clean thefan coverENGINE STARTS BUT DOES NOT RUN SATISFACTORILYExhaust Dense Blue Blacksmoke:Engine damageCarry out compression testChoke onCheck choke wire andchoke valve