I thought I'd share how things went with the Motobecane, so here's how things went:
I found another Motobecane with an intact engine that sat since 1988 - so did a transplant. Other work:
- Swapped clutch inner rotor
- Converted to external condenser
- New petcock
- New carburetor (Dellorto SHA, instead of original Gurtner)
- New rear wheel bearings
- New drive chain
- New rear brake plate
- New control cables
- Hand grips
- Bar end mirrors.
- New tires
- Sandblasted and repainted sidecovers
- Cogged drive belt
- Rebuilt horn/headlamp switch
- Swapped headlight bucket & speedo
- NOS chrome gas cap
- NOS 70s Saddlebags
- NOS replacement headlamp
Flat out, it'll do around ~37mph on a good day, tucked in. I still need to get some new fork boots too...