Magnum X swing arm adjustment

After reinstalling the C70 engine on the Magnum X. The chain started jumping off the sprocket. I tightened the chain but this didn't solve the issue. It turns out that although the 10mm swingarm axle was the right size for the swing arm where it mounted on the frame the hole is 12mm. That play in the swing arm was causing the chain to jump. I made up a metal sleeve and Boom no more chain jump!