Stihl FS 350 Instruction Manual - Page 36
Engine Running Behavior
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English / USA Engine Running Behavior If engine is down on power, difficult to start or runs poorly at idling speed, first check the spark plug. : Remove spark plug - see "Starting / Stopping the Engine". : Clean dirty spark plug. : Check electrode gap (A) and readjust if necessary - see "Specifications". : Use only resistor type spark plugs of the approved range. Rectify problems which have caused fouling of spark plug: : Too much oil in fuel mix. : Dirty air filter. : Unfavorable running conditions, e.g. operating at part load. Fit a new spark plug after approx. 100 operating hours or earlier if the electrodes are badly eroded. 000BA036 TR If engine running behavior is unsatisfactory even though the air filter is clean and the carburetor and throttle cable are properly adjusted, the cause may be in the muffler. Have your STIHL dealer inspect the muffler for carbonization. STIHL recommends that maintenance and repair work be carried out only by authorized STIHL dealers. 1 To reduce the risk of fire and burn injury, use only spark plugs authorized by STIHL. 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 boot and ignition wire connector in the boot may create arcing that could ignite combustible fumes and cause a fire. FS 300, FS 350, FS 400, FS 450, FS 480 35