Stihl 018 Instruction Manual - Page 43

Checking Spark Plug Starter Rope A Wrong fuel mix (too much engine oil in the gasoline), a dirty air filter and unfavorable running conditions (mostly at part throttle etc.) affect the condition of the spark plug. These factors cause deposits to form on the insulator nose which may result in trouble in operation. If engine is down on power, difficult to start or runs poorly at idling speed, first check the spark plug. • Remove spark plug see chapter "Starting": Clean dirty spark plug. •• Check electrode gap it should be 0.5mm/0.02" (A) readjust if necessary. • Use only resistor type spark plugs of the approved range. Rectify problems which have caused fouling of spark plug: Incorrect carburetor setting, too much oil in fuel mix, dirty air filter, unfavorable running conditions, e.g. operating at part load. 017, 018 000BA039 KN 000BA036 TR 1 • Fit a new spark plug after approx. 100 operating hours or earlier if the electrodes are badly eroded. !Warning! To reduce the risk of fire and burn injury, use only spark plugs authorized by STIHL (see "Specifications"). Always press spark plug boot (2) snugly onto spark plug terminal (1) of the proper size. (Note: If terminal has detachable SAE adapter nut, it must be attached.) A loose connection between spark plug terminal and ignition wire connector in the boot may create arcing that could ignite combustible fumes and cause a fire. The starter rope is subject to normal wear and tear. To prolong its service life, please observe the following points: • Do not pull out the rope more than 70 cm (about 28 in) it might otherwise break. • Do not let the starter grip snap back - guide it slowly and vertically into the housing so that the starter rope can rewind properly. Do not hold it sideways so that it rubs against the guide bush. Always replace a damaged starter rope in good time or have it replaced by your STIHL dealer. Replacing Starter Rope/Rewind Spring Remove the shroud. •• Unscrew the oil tank filler cap and drain the tank. • Unscrew the fuel tank filler cap and drain the tank. • Always keep chain oil and fuel mix in approved safety-type canisters. • Remove the screws from the fan housing and hand guard. Lift away the fan housing. •• Tension the starter rope or rewind spring or replace as necessary. 41