I have a lawn mower with a Kohler XT7 engine.
The spark plug threads were never very sound and are now cross threaded for the last time.
I'd been able to trim the crossed threads out when this happened before, leaving most of the threads intact, but theres no fixing it now.
I've looked up the various thread repair kits with inserts, but the thick head and odd angle of the spark plug hole makes this look to be very difficult to do properly.
The odd angle of the plug and poor access to it is the main reason I kept getting it started wrong.
Is there any way to simply thread this head for a spark plug with a larger shank?
The present plug is a long shank 14 mm.
I'd be more than happy to pay some one to install a thread repair insert, but no shop I've contacted wants to do this. The mower is in fair shape otherwise but not in such great shape that I'd want to invest in a new cylinder head.
The alloy of the original head seems to be less than durable when it comes to the threads.