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If you read the story of the restoration, you'll find that it was in a crate from the day it was made until recently, and then restored using factory drawings for/by BMW themselves.

The project was handed over to various specialists and BMW workshops. Hans
Keckeisen was in charge of the bodywork, and specialist vintage Boxer engine expert Armin Frey worked on restoring the priceless motor. The bike was stripped down to see what was usable and what would have to be remade. The task in hand became slightly easier when the original design drawings were discovered in the BMW archives.

The engine was badly corroded and parts needed to be found from various sources. Some of the missing parts were reasonably easy to gather, as there was an amount of crossover from existing models, other unique parts were remade in Frey's workshop. The four-speed gearbox and final drive were pulled down and the electrical system was also completely rebuilt. This was not your back-yard restoration; the full financial and resources backing of BMW were called into play.