I myself would not go the route of using a helicoil on a spark plug. I have seen to many of them get pulled out with the plug. Reason being the sealing ring on the bottom of spark plug when tightened down will catch the edge of helicoil and back it out with the plug. I would use a threaded spark plug insert with red loctite and for safety measures prick punch the bottom of the insert and head. Just my 
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149,682,1641,1711 with a 12hp in it 1 8" brinly plow 1 10" brinly plow 451 snow blower,H-48 International snow thrower 42" york rake with fold down grader blade.
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