Motobecane Top Speed problems

David Dear /
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I have a 78 Motobecane 50V, and it won't get over 15mph. The carb is spotless.

Also, if I give it a tiny bit of choke by barely depressing the lever, I can sometimes get a little extra speed (up to 19-20mph) out of it. Since the choke restricts airflow, that make me think its running too lean, but other than what I've already done.

Is it possible the throttle cable isn't adjusted right and I'm never getting wide open?

Below is the list of things I've done to it. Any ideas on what else to check?

- Replaced petcock and fuel line

- New spark plug

- Cleaned exhaust port on engine

Thanks

Dave

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