I'm going with a band brake on the jackshaft.
bought the cheapest 5/8" centrifugal clutch on ebay, was $15 shipped to my door. Took it apart and gutted it. I will weld the center hub to the outer drum. Then take a band brake and attached it to the jackshaft mount. I think this is going to work well, and is dirt cheap and easy to implement. Actually it's so easy to implement, could have *two* of them on the jackshaft, with a brake handle on each side of the bars!
bought the cheapest 5/8" centrifugal clutch on ebay, was $15 shipped to my door. Took it apart and gutted it. I will weld the center hub to the outer drum. Then take a band brake and attached it to the jackshaft mount. I think this is going to work well, and is dirt cheap and easy to implement. Actually it's so easy to implement, could have *two* of them on the jackshaft, with a brake handle on each side of the bars!