Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Hi, my name is***** will be assisting you.
You are correct in that the piston/cylinder damage would not keep you from getting spark to the plug but it would keep you from getting the machine started.
If you are not getting any spark to the plug the first thing that I would do is unplug the small ground wire that goes to the ignition coil itself and then recheck for spark at the plug. If you get spark then you know that the ignition coil is still good and the problem is in the wiring. If you still have no spark with that wire unplugged then the ignition coil is bad and will need to be replaced. It should still be under the Stihl ignition warranty and you should be able to have the Stihl dealer replace it at no cost to you.
If you are getting spark but it still won't start then I would do a compression check to make certain that you have at least 90 PSI compression on the machine. If less than 90 PSI then it will not start and run or if it does it will be very difficult to get started.
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