stripped spark plug hole

[djnm]

Help junior mechanic son stripped the hole taking the plug out of 2002 ttr 125. is this repairable and how much?

 

[Bricks88]

HELI-Coil, Repair manual and Head gasket.The heli coil will replace the spark plug threads,The repair manual is for the timing chain and valve system and the head gasket is there because you need to take the cyl. head off.Little bits of metal dont go well with piston rings and cylander walls. JMHO