update on the jack shaft shifter bike. now that the weather is better i've put a few miles on it. the shimano 3 speed hub is holding up with no problems. it rides great and the extra gears make it a joy to ride. the motor is running better all the time, only problem i've had was after the engine got broke in it started running poorly once it got up to temp, after some head scratching tracked it down to the exhaust valve being to tight. readjusted the valves and it's back to running great. now that i'm confident the 3sp hubs will hold up were building another with a sram i motion hub. will post pics of it soon.