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Remove for the n-th time the pull start assembly. Confirm the engine will in fact rotate by hand. Turn the flywheel a full turn or more ensuring that the engine is free. You should expect to feel some resistance from the compression cycle.
Holding the hand crank assembly attempt to pull the pull-cord and observe that the hub rotates. When released the spring returns the cord and handle into the wound position.
If the cord will not pull or operate as expected then remove and reassemble the cord into the pulley making sure that the knot retaining the cord is small enough and does not interfere with the operation. U-tube has several videos showing how to assemble the cord to the hub.
The string assembly should reach a point far enough out when you pull the cord that it lets it spin free of the engine. What you are probably experiencing is the engine kick-back, where the engine is compressing the air/gas in the cylinder, and the pressure pushes the engine back. The crankshaft is connected to the pull cord assembly, so it's pulling out of your hand. You may not be pulling hard enough, or the cord assembly needs replacing.
i had a problem like this on an old mower, the cord had become tangled inside the unit, it limited the pull of the cable so it would now spin the engine enough to start. it is not too difficult to to pop the top off the unit and check for tangles or knots
I assume that you are speaking of a pull start mechanism.
I can not imagine how to put a put pull starter back on "wound tight".
Your pulling on the cord tightens a spring which pulls the cord back in.
They go back together with the cord fully wound onto the spool.
Usually, I only take these apart to replace the cord.
Wind the new cord onto the spool without handle.
Reassemble, then pull out on the cord a little when attaching the handle to the cord.
This is the only way to get tension onto the spring at the fully retracted position because the catch for the spring is on the machine and the spring itself is on the underside what you are assembling.
If you do not wish to shorten the cord or replace it, then remove the handle, assemble enough to catch the spring, wind one turn tighter then feed rope through hole and reattach handle. Easier said than done.
If your spring is broken, then you will be needing a new one.
sounds like the spring is broken itself.there should be a hook at one end and a loop at the other end.the hook usualy breaks off but the spring looks good.replace the spring with part number..4140 190 0600 ....that is the stihl part number.let me know if this helped you...if not give me a quick mail and i'll try to help some more......