Bryan Bos ready to take this friction drive out for a summer spin.⁠ ⁠ Who else is running friction drives these days?⁠ ⁠ #4stroke #frictiondrive #motorizedbicycle #motorbike #motorizedbike #38cc #49cc #4strokes #motorizedbicycles #motorizedbikes #motorbikes #4strokepower #huasheng #bikeberry #flyinghorse #bbrtuning #megamotors