I just got a 2002.5 5E Bullit and I'm getting some crank scrape on the drive side. The cranks are RF NorthShore 170mm Microdrives. JRA it's no problem, but when I really push it the drive side scrapes the lower tube of the swing arm. So far I haven't touched it mechanically. I've worked with plenty of other BB's, but not this one. Is the chain line adjustable? I haven't checked the BB length, but there's plenty of room on the non drive side. Any suggestions?