Uwe Ehinger describes himself as a ?motorcycle archaeologist,? and the description is apt. He knows where to find the most obscure parts, and he knows which parts are worth finding.
His motorcycles are always imbued with history, using vintage components in unusual yet appropriate ways. This flathead is the perfect example: it?s an odd amalgam of pre-War Harley bits, but somehow it makes sense.

Uwe runs the Ehinger Kraftrad studio with his partner, the designer Katrin Oeding. They?re based in Hamburg, Germany, but focus on machinery from Milwaukee.
This bike is a personal project for Uwe, who has always wanted to build a dirt track bike for himself. The core of the machine is a 1937 ULH big twin, which means it?s a high-compression version of the regular side-valve flathead.
This particular 80ci (1340cc) unit has earlier VLH-spec cylinders sandwiched between the cases and heads, though?a tweak that reveals Uwe?s attention to detail.
?The V cylinders were only built for one year, 1936,? Uwe explains. ?Their casting is better than the U cylinders. But the lower part of the U engine is better than the the VL engine, due to the oil supply/pump.?

Uwe has used the interchangeability of the parts to build the best possible engine, but he hasn?t stopped there. He?s added a more noticeable modification?an Aisin AMR 300 supercharger. It sits right behind the rear cylinder, filling out the triangle of the hardtail frame nicely.
These roots-type units are commonly found on ti...