Your backpack STIHL petrol blower is all the more efficient when full performance is guaranteed. To maintain the reliability of your leaf blower, you should undertake proactive and regular maintenance on it. Simple maintenance tasks can usually be performed quickly using the components of Service Kit, and will help to extend the life of your power tool. STIHL Service Kit for BR 500, BR 550, BR 600 and BR 700 includes the following components for standard maintenance tasks: Paper air filter, Spark plug and Fuel filter.