what is a vilbrequin,its a moped part i think and its spelt in french?

Answer 1

There's two possible meaning to this word in french, as a tool it could be translate a manual drill (in the old days). In mechanic, it the crankshaft: the part that give (when it in rotating fonction), movement to the piston of an engine.

Answer 2

Un vilbrequin is a tool with one rod being turned by an elbowed handle used to drill or to make holes.(Chignole)
Also in mecanic for cars, it is used for a rotating movement.... Amitiés.

Answer 3

It is the crank or crankshaft, the part that is in the crank case