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Have an HT101 pole saw, nearly new condition, that just would not start after running quite smoothly. Stihl dealer took apart & found a broken piston ring; about 1/8 of ring end missing but with no trace of the missing part and no damage to the sleeve or piston. Bought new rings & reassembled per their guidance relative to crankshaft to cam gear alignment. Saw still will not start. Check of spark plug indicates spark is strong. Removal of exhaust and cranking shows gas fumes exhausting ok and an occasional 'pop' indicating combustion but not sustained. Talking with a Stihl rep, he indicated that the coil, if the ID number is below 515, which it is, may be problematic. Any sugggestions as to further checks. It still seems that either the spark timing is off, meaning that reassembly was done incorrectly or the coil is defective. Thanks; John at

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  • bczerkie May 11, 2010

    Is it still down? 2 months but no update. In reply to new coil not bad, new stuff does go bad all the time. My HT 101 coil died on first job, was replaced and now is fine. Did you see the broke ring. are you saying 1/8 ring gone or 1/8" of ring gone? You will have a gap, called ring end clearance. shape of ehd should tell if broken or not and gap. Did tech. set coil gap or did you? Let me know where you are on repair. and all work should be free for that as has great warrenty on electronics. Bill Czerkie



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Its not likly to be the coil on a relativly new machine it sounds as though the technigtion put something together wrong

Posted on Sep 29, 2009


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