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stihl fs 66 - no spark?

trying to troubleshoot FS66 with no spark - need wiring diagram or what are trigger/coil voltages and test procedures?

Thanks
wes, July 2009
Its best to disconnect the cut out switch just to see that its not faulty, try a spare plug and make sure that its grounded on the engine metal. If still no spark then almost certainly you'll need a new coil, but you should see a resistance between the spark plug and cut out wires.

John, July 2009
link Click here to see other fixes for Stihl FS66.