Stihl HL 90 Product Instruction Manual - Page 15

English Adjusting the Throttle Cable Fuel 1 3 2 1 N Loosen the clamp screws (1). N Push the gearbox (2) onto the drive tube (3) - turn it back and forth at the same time until the end of the drive tube is no longer visible in the slot (arrow) - then push fully home as far as stop. N Line up the gearbox on the drive tube so that the machine support on the engine points down and the blades are horizontal. N Tighten down the clamp screws (1) firmly. 445BA003 KN A properly adjusted throttle cable is the precondition for correct operation in the starting throttle, idle and full throttle positions. Adjust the throttle cable only when the machine is completely and properly assembled. N Use a suitable tool to push the slide to the end of the slot (see illustration). 1 2 N Press down the trigger lockout (1) and squeeze the throttle trigger (2) (full throttle position) - this sets the throttle cable correctly. 002BA161 KN 002BA163 KN This engine is certified to operate on unleaded gasoline and the STIHL twostroke engine oil at a mix ratio of 50:1. Your engine requires a mixture of highquality gasoline and two-stroke air cooled engine oil. Use mid-grade unleaded gasoline with a minimum octane rating of 89 ((R+M)/2) and no more than 10% ethanol content. Fuel with a lower octane rating may increase engine temperatures. This, in turn, increases the risk of piston seizure and damage to the engine. The chemical composition of the fuel is also important. Some fuel additives not only detrimentally affect elastomers (carburetor diaphragms, oil seals, fuel lines, etc.), but magnesium castings and catalytic converters as well. This could cause running problems or even damage the engine. For this reason STIHL recommends that you use only high-quality unleaded gasoline! Gasoline with an ethanol content of more than 10% can cause running problems and major damage in engines and should not be used. The ethanol content in gasoline affects engine running speed - it may be necessary to readjust the carburetor if you use fuels with various ethanol contents. WARNING To reduce the risk of personal injury from loss of control and / or contact with the running cutting tool, do not use your HL 90 K 13