Big_ross94

Hello I was wondering if anyone could help me I have a dt125r with an Athena 170 cylinder I recently had clutch rebuilt because it was slipping or so I thought well I got it back from the garage it rode ok but later on that day I was trying to pick up speed but all it did was scream a bit and back fire but at low revs it rides fine one thing is though my power valve is screwed in is it dirty carb broken power valve or bottom end gone