Well, this is what I did this spring. I previously had an Avon 250, which btw is probably same size as Metz 260 so you probably have room with the conventional 240 mod. But, to gain more clearance, this is a list of mods I did.
Downside is now I have no room for belt guard. But not really a big issue.
- Offset front pulley
- 240 comp bowl machined down 3/8" wider then 180 comp bowl
- New Comp bowl spacer 3/8" wider then current
- new Left spacer 3/8" narrower then current spacer
- I ground a little off inside of my swingarm for a little more room for pulley (not necessary but it was tight)