As soon as the final weld cooled on the main chassis tube and I tried to slip it over the engine, I realized I had a major problem. It wouldn't go, the interior space was too small for the engine.br/Some head-scratching and troubleshooting and I figure out that I had originated the error in my photograph of the motor: the tape measure in the shot wasn't perfectly perpendicular to the axis of the camera, and was foreshortened by about 3%. I confirmed this by measuring the distance between two bolt heads.br/So, I could either burn more time, and throw it away, or I could come up with a solution. Notching the frame was what I chose.br/A friend saw the bike with the motor (finally) sitting in the chassis, and he commented that it looked like the motor had melted it's way into the chassis.