Hello fellow moped riders! I have just finished a full restoration/custom build on a 1973 Peugeot 103. The freshly built engine turns nicely with good compression, the rear wheel turns nicely, the pulley spins nicely and is well greased. However when I install the belt it becomes almost impossible to pedal. I must be missing something, any ideas? I have tried different spacing on the pulley to no avail. Everything is lined up correctly. Desperate as I at the end and want to ride! Any and all suggestions will be gratefully received.