Stihl BG 86 Product Instruction Manual - Page 22

English 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. 2 1 Engine Running Behavior If engine running behavior is unsatisfactory even though the air filter is clean and the carburetor is properly adjusted, the cause may be the muffler. N Have the muffler checked for contamination (carbonization). STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer. Rewind Starter To help prolong the wear life of the starter rope, observe the following points: N Pull the starter rope only in the direction specified. N Do not pull the rope over the edge of the guide bushing. N Do not pull out the rope more than specified. N Do not allow the starter grip to snap back, guide it back into the housing slowly - see chapter on "Starting / Stopping the Engine." Have a damaged starter rope replaced by your dealer before it breaks completely. STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer. 002BA071 KN To reduce the risk of fire and burn injury, use only spark plugs authorized by STIHL. Always press spark plug boot (2) snugly onto 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. 20 BG 56, BG 56 C, BG 66, BG 86, BG 86 C, SH 56, SH 56 C, SH 86, SH 86 C