Stihl MS 391 Product Instruction Manual - Page 57
Trademarks - farm boss
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damages to other engine components caused by the failure of a warranted part still under warranty. The following list specifically defines the emission-related warranted parts: - Air Filter - Carburetor - Fuel Pump - Choke (Cold Start Enrichment System) - Control Linkages - Intake Manifold - Magneto or Electronic Ignition System (Ignition Module) - Spark Plug - Catalytic Converter (if applicable) - Fuel Tank - Fuel Cap - Fuel Line - Fuel Line Fittings - Clamps - Fasteners Where to make a Claim for Warranty Service Bring the product to any authorized STIHL servicing dealer and present the signed warranty card. Maintenance Requirements mixture (see also instruction "Fuel"). Deviations from this recommendation regarding quality and mixing ratio of fuel and oil may require shorter maintenance intervals. Limitations This Emission Control Systems Warranty shall not cover any of the following: N repair or replacement required because of misuse, neglect or lack of required maintenance, N repairs improperly performed or replacements not conforming to STIHL Incorporated specifications that adversely affect performance and/or durability, and alterations or modifications not recommended or approved in writing by STIHL Incorporated, and N replacement of parts and other services and adjustments necessary for required maintenance at and after the first scheduled replacement point. Trademarks English STIHL Registered Trademarks STIHL® { K The color combination orange-grey (U.S. Registrations #2,821,860; #3,010,057, #3,010,058, #3,400,477; and #3,400,476) 4-MIX® AUTOCUT® EASYSTART® FARM BOSS® OILOMATIC® STIHL Cutquik® STIHL DUROMATIC® STIHL Quickstop® STIHL ROLLOMATIC® STIHL WOOD BOSS® TIMBERSPORTS® YARD BOSS® Some of STIHL's Common Law Trademarks The maintenance instructions in this manual are based on the application of the recommended 2-stroke fuel-oil MS 311, MS 391 55