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Question edited for a lot more clarity. It is a 'Stihl', not a 'still'. Please always state FULL 'make model (what it is)'.
Question moved to model category.
The standard way to test any HT Ignition coil is as follows.
Remove the spark plug and ground it to the cylinder head.
Disconnect the positive lead.
Ground a 12 volt battery - (minus) to the cylinder head.
Touch a positive wire to the positive on the coil and release.
The plug should spark when you REMOVE the positive power.
You seem to have done everything, you need to make sure you have a 0.3mm gap between the coil and the flywheel magnets, you also need to give the starter a good pull when checking for a spark, if all this fails then the new unit is bad, is it a genuine Stihl part? if its a cheap Chinese copy then it will not be a good quality item.
Coils are usually engine specific, the number of bolts does not determine whether or not it will work. If you really want your chainsaw to work correctly - buy the right part. It's a cheaper than a new one! Using the model number you supplied, I found them for under $50, which is about the value of an old 050 Stihl -wow, that's a heavy old saw. If you are still (Stihl ;^ )) not sure, call a Stihl repair facility. There may be an old timer mechanic who knows.
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