Stihl Fs 80 R Owners Manual
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40 English / USAFS 80, FS 80 R, FS 85, FS 85 R Rule of thumb Turn high speed screw (H) about 1/4 turn over for every 1000m (3.300 ft) change in altitude. Conditions for adjustment Adjust the high speed screw (H) only if you are using a mowing head, making sure the cutting lines are full length (as far as the limiter blade on the deflector). If you mount a metal cutting tool, use the standard setting. : Carry out standard setting without changing position of high speed screw (H). : Warm up engine for about 5 minutes if you are using a metal cutting tool or about 3 minutes if you are using a mowing head. : Open the throttle wide. At high altitude : Turn high speed screw (H) clock- wise (leaner) no further than stop until there is no noticeable increase in engine speed. At sea level : Turn high speed screw (H) counter- clockwise (richer) no further than stop until there is no noticeable increase in engine speed. It is possible that maximum engine speed may be reached with the standard setting in each case. Adjusting Idle Speed It is usually necessary to change the setting of the idle speed screw (LA) after every correction to the low speed screw (L). : Warm up the engine. Engine stops while idling : Turn idle speed screw (LA) slowly clockwise until the engine runs smoothly – the cutting tool must not rotate. Cutting tool rotates when engine is idling : Turn idle speed screw (LA) slowly counterclockwise until cutting tool stops rotating and then turn the screw about another 1/2 to 1 turn in the same direction. Erratic idling behavior, engine stops even though setting of LA screw is correct, poor acceleration Idle setting too lean: : Turn low speed screw (L) counterclockwise (about 1/4 turn) until the engine runs and accelerates smoothly. Erratic idling behavior Idle setting too rich: : Turn low speed screw (L) clockwise (about 1/4 turn) until the engine runs and accelerates smoothly.
41 FS 80, FS 80 R, FS 85, FS 85 R English / USA If the engine is low on power, check the spark arresting screen in the muffler. : Lift spark arresting screen and pull it out sideways. : Clean spark arresting screen if necessary. : If screen is damaged or coked up, fit a new one. : Refit the spark arresting screen. * see “Guide to Using this Manual” 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 result in trouble in operation.If engine is down on power, difficult to start or runs poorly at idling speed, first check the spark plug. : Remove spark plug – see Starting / Stopping the Engine. : Clean dirty spark plug. : Check electrode gap (A) and readjust if necessary – see Specifications. : Use only resistor type spark plugs of the approved range. Rectify problems which have caused fouling of spark plug: : Too much oil in fuel mix. : Dirty air filter. : Unfavorable running conditions, e.g. operating at part load. Fit a new spark plug after approx. 100 operating hours or earlier if the electrodes are badly eroded. Spark Arresting Screen* in Muffler 392BA035 KN Checking the Spark Plug 000BA002 KN
42 English / USAFS 80, FS 80 R, FS 85, FS 85 R To reduce the risk of fire and burn injury, use only spark plugs authorized by STIHL. Always press spark plug boot (2) snugly onto spark plug terminal (1) of the proper size. (Note: If terminal has detachable SAE adapter nut, it must be attached.) A loose connection between spark plug boot and ignition wire connector in the boot may create arcing that could ignite combustible fumes and cause a fire. : Check grease level regularly - about every 25 hours of operation. : Unscrew the filler plug (1). : If no grease can be seen on the inside of the filler plug, screw the tube (2) of STIHL gear lubricant for brushcutters - see “Special Accessories” - into the filler hole. : Squeeze up to 1/5 oz (5 g) grease into the gear housing. Do not completely fill the gear housing with grease. : Refit the filler plug and tighten it down firmly. Removing the Starter Cover :Take out the screws ( 1). : Lift the starter cover ( 2) away from the tank ( 3) and pull it out from under the shroud ( 4). 000BA036 TR 1 Lubricating the Gearbox 1 233BA010 KN 2 Replacing the Starter Rope and Rewind Spring 1 11 2 3 4 392BA013 KN
43 FS 80, FS 80 R, FS 85, FS 85 R English / USA Removing the Rope Rotor : Take out the screw ( 5). : Remove the rope rotor very carefully. The rewind spring is seated in the rope rotor and may pop out and uncoil if care is not taken. The pieces of broken spring may be under tension and fly apart unexpectedly when you remove the rope rotor. To help reduce the risk of injury, wear face protection and gloves. Replacing the Starter Rope :Use a screwdriver to pry the cap ( 6) out of the starter grip. : Remove remaining rope from the rotor and grip, making sure the ElastoStart sleeve is not pushed out of the grip. : Tie a simple overhand knot in the end of the new starter rope (see Specifications) and then thread the rope through the top of the grip and the rope bushing ( 7). : Refit the cap in the grip. : Pull the rope through the rotor and secure it with a simple overhand knot. : Go to Installing the rope rotor. Replacing a Broken Rewind Spring Two types of replacement spring are available from the factory: – A ready-to-fit rewind spring secured with a wire retainer. – A rope rotor with pre-installed rewind spring. Installing the ready-to-fit rewind spring : Lubricate the spring with a few drops of non-resinous oil – see Special Accessories – do not open the wire retainer! 5 392BA014 KN 6 7 392BA015 KN 392BA024 KN
44 English / USAFS 80, FS 80 R, FS 85, FS 85 R : Carefully remove the parts of the old spring from the starter cover and rope rotor. : Insert the new rewind spring in the rope rotor and, at the same time, engage the outer spring loop in the rotor’s recess – the wire retainer slips off in this process. If the spring pops out and uncoils, refit it in the counterclockwise direction, starting outside and working inwards. : Go to Installing the Rope Rotor. Installing rope rotor with rewind spring : Carefully unpack the new rope rotor with rewind spring. The spring may pop out if not handled with care – risk of injury. : Lubricate the spring with a few drops of non-resinous oil – see Special Accessories. : Go to Installing the Rope Rotor. Installing the Rope Rotor :Check dimension a for inner spring anchor loop and bend it slightly if necessary. : Coat rope rotor bearing bore with non-resinous oil – see Special Accessories. : Slide the rotor onto the starter post – turn it back and forth until the rewind spring anchor loop ( 8) engages. : Insert the screw ( 5) and tighten it down securely. : Go to Tensioning the Rewind Spring. Tensioning the Rewind Spring :Make a loop in the unwound starter rope and use it to turn the rope rotor six full revolutions counterclockwise. Hold the rotor steady – straighten the twisted rope – release the rotor – let go of rope slowly so that it winds onto the rotor. : Check spring tension: – The starter grip must be firmly seated in the rope guide bushing. If the grip droops to one side: Add one more turn on rope rotor to increase spring tension. – When the starter rope is fully extended it must be possible to rotate the rotor another half turn. If this is not the case, the spring is overtensioned and could break. Take one turn of rope off the rotor. : Go to Fitting the Starter Cover. a 389BA029 KN a = 2mm (0.08 in) 8 392BA025 KN 392BA044 KN
45 FS 80, FS 80 R, FS 85, FS 85 R English / USA Fitting the Starter Cover : Push the upper mounting boss ( 2) under the shroud ( 4) – line up the tank ( 3)and push the lower part of cover onto the tank. : Insert and tighten down the housing screws ( 1). For periods of about 3 months or longer : Drain and clean the fuel tank in a well ventilated area. : Dispose fuel properly in accordance with local environmental requirements. : Run engine until carburetor is dry – this helps prevent carburetor diaphragms sticking together. : Remove, clean and inspect the cutting tool. : Thoroughly clean the machine – pay special attention to the cylinder fins and air filter. : Store the machine in a dry, high or locked location – out of the reach of children and other unauthorized persons. : Use a file (special accessory) to sharpen cutting tools. In case of more serious wear or nicks: Resharpen with a grinder or have work done by STIHL dealer. : Resharpen frequently, take away as little material as possible – two or three strokes of the file are usually enough. To avoid out-of-balance : After resharpening about 5 times, have blade checked on STIHL balancer (special accessory) and rebalanced as necessary. 1 1 1 2 3 4 393BA045 KN Storing the Machine Sharpening Metal Cutting Tools
46 English / USAFS 80, FS 80 R, FS 85, FS 85 R : Resharpen the cutters (1) uniformly – do not alter the contour of the parent blade (2) in any way. See cutting tool packaging for additional sharpening instructions. 22 1 2 11 002BA042 KN
47 FS 80, FS 80 R, FS 85, FS 85 R English / USA 1) STIHL recommends that this work be done by a STIHL servicing dealer * Not in all versions, market-specific Maintenance Chart Please note that the following maintenance intervals apply for normal operating conditions. If your daily working time is longer than normal or cutting conditions are difficult (very dusty work area etc.), shorten the specified intervals accordingly. before starting work after finishing work or daily after each refueling stop weekly monthly every 12 months if problem if damaged as required Complete machine Visual inspection (condition, leaks) XX Clean X Control handle Check operation XX Air filter Clean XX Replace X Pick up body in fuel tank Check X Replace XXX Fuel tank Clean XX Carburetor Check idle adjustment – the cutting tool must not turn XX Readjust idle X Spark plug Readjust electrode gap X Replace after about 100 operating hours Cooling inlets Inspect X Clean X Spark arresting screen* in muffler Check XX Replace XX All accessible screws and nuts (not adjusting screws) Retighten X Anti-vibration element Check X Have replaced by servicing dealer 1)X
48 English / USAFS 80, FS 80 R, FS 85, FS 85 R Please note that the following maintenance intervals apply for normal operating conditions. If your daily working time is longer than normal or cutting conditions are difficult (very dusty work area etc.), shorten the specified intervals accordingly. before starting work after finishing work or daily after each refueling stop weekly monthly every 12 months if problem if damaged as required Cutting toolsInspect XX Replace X Check tightness of cutting tool XX Metal cutting tools Sharpen XX Gearbox lubrication Check X Replenish X Safety labels Replace X
49 FS 80, FS 80 R, FS 85, FS 85 R English / USA 1 Fuel pump 2 Choke lever 3 Carburetor adjusting screws 4 Starter grip 5 Fuel filler cap 6 Fuel tank 7 Muffler (with spark arresting screen*) 8 Throttle trigger 9 Slide control 10 Throttle trigger interlock 11 Bike handle 12 Handle support 13 Throttle cable retainer 14 Clamp (carrying ring for harness) 15 Spark plug boot 16 Air filter cover 17 Machine support 18 Barrier bar, not in all versions, market-specific 19 Loop handle 20 Drive tube # Serial number Parts and Controls Part 1 10 # 18 4 12 13 11 8 9 10 13 14 15 16 179 8 19 393BA043 KN 1 2 3 5 67 20 20 14