I'm Dave and I have multiple bikes I ride from stretched beach cruisers to a customer trike that I'm getting ready to add a 6.5 HP motor. I have a Facebook page "motorized custom bicycles"
When I was 15 years old I bought a large motorless homemade mini bike. I put a 10 HP cement mixer engine on it and it would easily go 65mph, only did that a few times. It was real fast and it was geared high at 15mph the engine was just over idle speed. I'm not trying to encourage anyone with this story. Almost rode it off the unfinished Verrazano Bridge the rebar was yet to be paved.
When I was 15 years old I bought a large motorless homemade mini bike. I put a 10 HP cement mixer engine on it and it would easily go 65mph, only did that a few times. It was real fast and it was geared high at 15mph the engine was just over idle speed. I'm not trying to encourage anyone with this story. Almost rode it off the unfinished Verrazano Bridge the rebar was yet to be paved.