Stihl TS 410 Instruction Manual - Page 46

English Correcting the carburetor setting for use at high altitudes The setting may have to be marginally corrected if engine performance is unsatisfactory at high altitudes: N Make standard setting N Let the engine warm up N Turn the high speed adjusting screw (H) slightly clockwise (leaner) - max. up to the stop NOTICE After descending from a high altitude, restore the carburetor setting to the standard setting. If you make the setting too lean it will increase the risk of engine damage through lack of lubrication and overheating. Spark Arresting Screen in Muffler The muffler of your machine is fitted with a spark arresting screen. N If engine performance deteriorates, check the condition of the spark arresting screen in the muffler. Clean or replace the screen, as necessary. To reduce the risk of fire, never operate the machine without a properly maintained and undamaged spark arresting screen in place. WARNING Wait until the engine and the muffler have cooled completely before performing the following operations. 2 1 Spark Plug If there is a loss of engine power, the machine is difficult to start or runs poorly at idle, first check the spark plug. Install a new spark plug after approximately 100 operating hours or earlier if the electrodes are eroded/corroded. The wrong fuel mix (too much engine oil in the gasoline), a dirty air filter and unfavorable running conditions (mostly at part throttle etc.) affect the condition of the spark plug. These factors cause deposits to form on the insulator nose, which may degrade performance. Removing the spark plug N Turn off the engine - move the stop switch to STOP or 0 N Remove the screw (1) N Pull the spark arresting screen (2) upwards out of the muffler N Clean the dirty spark arresting screen N If the screen is damaged or heavily carbonized, install a new one N Re-install the spark arresting screen in the reverse order of steps 1 2 N Remove the screw (1) and remove the cap (2) - the screw (1) is secured in the cap (2) to prevent loss 370BA031 KN 1307BA030 KN 44 TS 410, TS 420