As the motor spins up they are flung away by centrifugal force. To grab the starter two little arms are sprung against the plastic of the starter spool, which has a series of wedges on to engage them in one direction only. It acts as a flywheel, it acts as a fan to cool the engine, with scoops on it to pump air, it contains a magnet that passes a coil to fire the sparkplug and it connects to the starter cord. In this saw the driveshaft extends out of both sides of the motor, on one side driving the chain, on the other a thing called a flywheel is bolted. In my case a whole lot of pieces of aluminium fell out, so I needed a second part. Check that the spade connecter from the spark plug to the magneto is still attached, it fell off when I opened the case and this will really annoy you if you miss it. It is fixed with a nut on the back, so I used a pair of pliers to hold this, but it was still stupidly hard to get off. The fuel and bar oil caps need to be off to get the side off and there is a screw under the handle that is a complete pig to get out. Unplug the spark plug and then work on the side. First take the top panel off (2 Torks at the back, lift and slide back). The starter can be purchased as a single block with the starter cord and handle, this is relatively simple to switch out, although there is a trick.
#Magic trick chainsaw fail full#
Opening the side revealed that the motor had grabbed the starter under full power and wound the spring of the starter backwards until the spring and string broke. Closer investigation revealed all of my body parts still attached to me but the starter cord was broken and there was a crack in the casing on the starter side. I borrowed a Ryobi 40 cc chainsaw RCS 4040A and all was going well until there was a bang and the motor stopped.
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