im new to mopeds and I pulled an old franco Morini out of my mothers storage. its sat for at least 10 years that I know of and needs a lot of work. I was testing it to see if it was at least not locked up. the it pedals but stiffly, the clutch seems good but when I engage the lever on the handles the wheels go from spinning ok to locked up and wont move until i let go of the clutch. the piston moves also sluggishly. question is is this thing worth fixing or is the engine too far gone.