Cush drive on a trail bike?

Do modern single cylinder trail-bikes have cush drives? The reason I ask is that I have a slow-burner of a project to turn a scrofulous 350 Bullet I bought off e-bay into a green lane bike. The options for the back wheel are to either rebuild the rear wheel with an 18" alloy rim, or buy a complete rear wheel off a more modern (but still drum-braked) trail bike and make it fit. This may be a cheaper, lighter option, but would loose the cush drive from the hub. I'm not sure how useful it would be in off-road conditions to have a cush, hence my question. Any ideas?

Cheers, Jon

the CCMs dont but my Xt has???

My BMW XChallenge does, but my Honda XR's didn't

cush drive

My KTM 690 does. the 400 does not.

any help

My 610 Husky does, my 450 Berg doesn't.

I detect a pattern here.................