^ i had my moto cross mechanic buddy helicoil my k-star intake bolt holes
no problems, have been running this kit reliably at home and at rallies.
Its really not that hard to do yourself either but the helicoil kits can be a bit pricey.
tapping for a bigger bolt would be cheaper
either way you have to drill and tap. helicoils just bring the thread and bolt size back to the original size...
when tapping make sure to go slow, straight, and super clean. there are plenty of you tube videos out there that demonstrate both techniques
heli coils kits can be purchased at mcmaster carr. sometimes auto parts stores have them in limited sizes (usually they are referred to thread repair kits)