Motobecane Cady running rich

Soren Volder /
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Hello friends. I'm in the process of restoring my dad's old cady and I've actually got it running very well - right up until I put together the air filter box. When the box is assembled I lose about half the power and the spark plug gets soot very quickly. What could be wrong? It makes no difference if the screens are in the air filter box or not. It also looks like a bit of fuel is spraying out of the air intake.

When I leave the air filter box off It runs perfect and the plug is a nice light brown?

Will a clogged exhaust cause this? You know like a bad air flow thing?

The choke is not binding and pulling the choke almost kills the engine.

M1 engine

Thanks (edited)

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