Discussion for swapping a KDX motor in a MX frame...
- Posts: 19
- Joined: 12:10 am Nov 26 2019
- Country: New Zealand
My guess would be an early 83-85 KDX engine would fit. Maybe the 86-88 engine. I'd use Ebay crankcase/bottom end pics to get a better sense of it. Compare the 84 KX125 crankcases with 84 onwards KDXs. It's always going to take a bit of work - cutting new front mounts and head stays at the least. Main thing is that the back of the engines are the same layout. Good luck, it would be a cool build.