Stihl GS 461 Rock Boss174 Product Instruction Manual - Page 29

English Cleaning the Air Filter Engine Management Adjusting the Carburetor If there is a noticeable loss of engine power: N Dry wet air filter if necessary - do not expose to extreme heat N If the air filter is very dirty, clean the filter thoroughly Thorough filter cleaning N Wash the air filter in STIHL specialpurpose cleaner (special accessory) or a clean, nonflammable cleaning liquid (e. g., warm soapy water) - rinse the air filter from inside to out under a water flow - do not use high-pressure washers N Dry the air filter - do not expose to extreme heat, do not dry with compressed air N Do not oil the air filter N Reinstall air filter Always replace a damaged air filter. Exhaust emissions are controlled by the design of the fundamental engine parameters and components (e.g. carburation, ignition, timing and valve or port timing) without the addition of any major hardware. General Information The carburetor comes from the factory with a standard setting. This setting provides an optimum fuel-air mixture under most operating conditions. With this carburetor it is only possible to correct the adjusting screws within fine limits. The ignition module limits maximum engine speed. Therefore, maximum engine speed cannot be increased by turning the high speed screw (H) any further clockwise (leaner). Standard Setting N Shut off the engine. N Check the air filter and clean or replace if necessary. N Check the spark arresting screen (not in all models, country-specific) in the muffler and clean or replace if necessary. GS 461 27