Stihl FS 88 Instruction Manual - Page 38

Adjusting Carburetor FS88 { II t R L I ~~ /-1=1 I L-!@ IfF L.... ~ FS 108 I { II FS 88 r/ L I ~~ II rB~ 1~! ~l~ ~LA FS 108 I ,I ~H~L ~IJJ-R~- LD The carburetor has been adjusted for optimum performance under the barometric pressure and climatic conditions at the factory. Basic setting This setting is the starting point for fine tuning and can be used as the standard setting. • Check air filter and clean it if necessary. • Carefully screw the high speed adjusting screw (H) and low speed adjusting screw (L) down onto their seats (clockwise) and make the following adjustments: H Open 1 full turn L Open 1 full tum • Start the engine and adjust idling speed with the idle speed adjusting screw LA or LD: cutting tool must not rotate. This standard setting is the optimum setting of the high speed adjusting screw for normal operation at an altitude of about 300 m/1000 It above sea level. It ensures your machine will deliver maximum power, be fuel efficient and operate reliably. It may be necessary fine-tune the carburetor if operating conditions change, e.g. higher or lower altitudes, extreme changes in humidity and temperature or if you fit a different cutting tool: The fine tuning procedures described below ensure maximum performance new under t~e operating conditions. 37