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Short answer, NO. I’ve put many spark plug HeliCoils into these engines without tearing them down. Any good repair shop should be able to do this for you.
 
$30 for a helicoil $ 40 for a solid insert ( Aust $ ) .
Any engine if I have clean access to the plug hole
I do them in around an hour .
 
ask for a time sert. Next time the head is off have the hole Tigged and retapped.
 
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