It's a 1975 Motobecane 50V
The engine starts and runs great on the stand, variator moving in and out the way it shoud.
Then I take it for a test ride. For a bit it goes pretty good. Less power than I would expect, but it goes. Then after about 5 minutes all power is gone. The engine still revs good, but no go. I did think the belt might be slipping so I sprayed it with belt dressing.
On the recent test ride I noticed that even though I can rev the engine when the ped is misbehaving, the variator isn't moving in and out. This makes me suspect that it's not turning as fast as the engine which could be because the clutch is slipping when it gets warm.
Anyone have any thoughts or suggestions before I tear it apart? (To fix, or out of frustration I'm not sure yet)