Hello again. After 3 years or so, I'm back. I pulled my Diamondback MB out of the closet and started reassembling the beast. It feels good! Engine is a rare Tanaka 47R engine with matching expansion chamber, Scooterguy frame mount, 5:1 trans. Gearing is 10t/72t chainring sprocket, then 30t chainring sprocket to 11-34t Shimano rear cassette. Top speed before was 43mph. First gear climbed steep hills and ramps easily. I'm swapping the 30t to 24t for more rpms. I need to change cables and fuel hoses. I can't wait to ride again. It feels good to be back.