Ill tell ya,i went to the checker and they dont sell a helicoil.You have to buy the whole kit.Man have things changed since i was turning wrenches.[fulltime].Used the lathe again,idle screw for my other sons racing 2 stroke honda.somehow the throttle slide was sticking.Removed screw,the one that rides in groove on side carb, in slide,chucked in lathe,yup,out of round.Tapped with hammer 1/2 dozen times,little here,little there,nice and straight and throttle works perfect.Cost====FREE!.