Hi, I have two Motobecane 50v's I guess 1978, that I am rebuilding. I am unable to turn over the engine (the wingnut thing is in the correct position). I have taken the engines off the frames and when I turn the inside part of the clutch/variator (the part you pull off with the clutch puller) it doesn't turn the outside part (so it won't turn over the engine).
MY QUESTION IS: should the clutch be able to freewheel like that? I thought it should grab so that you can turn over the engine using the pedals. Also I noticed that the engine can pivot on the top engine mount, does this have anything to do with it? Does there need to be tension on the engine from the pulley in order for the clutch to engage? Also can anyone describe how the clutch on those is supposed to work? (i.e. should it slip at the start when you're idling then engage?).
I have read all the manuals I can find and also tried mopedriders.com but can't find a description of the operation.
Thanks for your answers and for the great site.