Stihl MS 311 Product Instruction Manual - Page 39

0001BA007 KN 0001BA008 KN Installing the air filter 1 2 N Insert the lugs (1) into the recesses (2) N Tilt the air filter toward the filter housing and close the clip N Refit the shroud and tighten the screws Engine Management English Adjusting the Carburetor 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. If the setting is too lean there is a risk of engine damage due to insufficient lubrication and overheating. Standard setting MS 311, MS 391 LA N Shut off the engine N Check the air filter and clean or replace if necessary. N Check the spark arresting screen (country-specific) in the muffler and clean or replace if necessary. 37