RE: rcv-91cd stripped exhaust threads
I had the same issue on a Saito 125 . I sent it to Clarence Lee and it was repaired and returned in a week for $28.50 . He installs a fitting in the exhaust port which is threaded to accept your header pipe. He may charge a teardown fee if you don't send him the head only. I would call for particulars. Good luck!
Chris
C.F.Lee Mfg.Co.
10112 Woodward Ave.
Sunland, CA 91040
(818)352-3766