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The Stihl FS45 has a particular way of getting started as do all the stihl products. We sell Stihl equipment in our store and service and repair them also. The normal starting procedure is to: Be sure the switch is turned to the ON position which is the negitive sign (-). The (O) is the off position. Press the primer bulb 3 times. Move the choke lever to on. Pull the starter cord three times only. If the engine fires, turn the choke to the off position and pull till it starts. If the engine did not try to start during the first three pulls with the choke on, you must turn the choke off and pull till it starts. Remember:Pulling more than three times with the choke switch on will flood the carburator on every stihl product thats on the market. However, if the units still refuses to start, being its new and still under warrenty, return it to the repair shop that services Stihl products and they will repair it according to warrenty. All parts and labor should be honored at no cost to you. Please provide your receipt and serial number located on a silver tag located on the unit or the mechanic will get it off the unit when he works on it. Either way, it will most likely have to have a new carburator put on it. I hope this helps. Please comment back if this was helpful. Thanks; George
You answered your own question. The source of the wobble may also be a worn bearing or bushing supporting the shaft the pulley is mounted on. Be certain that you are installing the belt over the proper path of pulley's I know that My personal Mower WEEDEATER 42" can have the belt installed wrong it works but will fall off in heavy grass.
its a 40:1 ratio. remember to never tap the tap-n-go too hard or it will bend the shaft, and make the head hot to the touch, and eventually will melt the inside. And always keep fuel stabilizer in the gas, because if you dont, especially in winter and fall, it will clog the carb so you have to keep pumping the throttle to keep it running and you have to run it on half choke all the time