I recently purchased a 1977 Motobecane 50V, and I am working to get it running by spring. Currently, it will not start at all. I am a newbie to moped repair, so please bear with me if I have failed to understand something fundamental.
The first thing I have tested for is the spark by following Fred's Guide. There is no spark. The one thing I have noticed is when I turn the pedals, the belt rotates the variator smoothly. However, the magneto only occasionally "catches" and turns. I usually have to pedal a little bit faster to get the magneto to turn, and it will only turn about once for every 4 or 5 rotations of the pedals. By listening carefully, I also believe that the piston is only moving when the magneto turns, but I could be wrong about this. Should the magneto be rotating at the same rate as the variator and pedals?
If this is even possible, it feels like the magento is somehow loose, such that it only occasionally "catches" and turns. Can anyone point me in a direction I could explore?
Thanks in advance for any advice!