Stihl 044 Instruction Manual - Page 28

Tensioning the Saw Chain Checking Chain Tension Fuel 1 Retensioning during cutting work: • Turn off the engine and then slacken the nuts. • Hold the bar nose up and use screwdriver to turn tensioning screw (1) clockwise until chain fits snugly against the underside of the bar while still holding bar nose up, tighten down the nuts firmly. • Go to section "Checking Chain Tension". 133BA024 KN 143BA007 KN Turn off the engine - •• Wear work gloves. Chain must fit snugly against the underside of the bar and, with the chain brake disengaged, it must still be possible to pull the chain along the bar by hand. • If necessary, retension the chain. A new chain has to be retensioned more often than one that has been in use for some time. • Check chain tension frequently see section "During Operation". This engine is certified to operate on unleaded gasoline and oil with the mix ratio 50:1. Your two-stroke engine requires a mixture of brand-name gasoline and quality two-stroke engine oil with the classification TC. Use regular branded unleaded gasoline with a minimum octane rating of 90 ROZ (U.S.A./Canada: pump octane min. 89!). If the octane number of the regular grade gasoline in your area is lower, use premium unleaded fuel. Fuel with a lower octane rating may result in preignition (causing "pinging") which is accompanied by an increase in engine temperature. 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 as well. This could cause running problems or even damage the engine. For this reason it is essential that you use only branded fuels! Use only STIHL two-stroke engine oil or equivalent branded two-stroke aircooled engine oils with the classification TC for mixing. 26 044