Reply To: Most common cause for compression loss on a gt125r? Forums 🚥 PiT STOP 🔧 Hyosung Technical Help Most common cause for compression loss on a gt125r? Reply To: Most common cause for compression loss on a gt125r? Oct 22, 2024 at 11:35 PM #15293 JimMember Topics: 11Replies: 129 Check valve clearances first!