Reply To: Gv650 coolant drain bolt size. Forums 🚥 PiT STOP 🔧 Hyosung Technical Help Gv650 coolant drain bolt size. Reply To: Gv650 coolant drain bolt size. Aug 19, 2021 at 3:42 PM #6118 EdMember Topics: 1Replies: 9 Ok,i worked out its a m8 bolt size with a thread pitch of 1.5.
