Re: Dual brake lever + cable pull disc brakes?
If your front fork does not have a place to mount a caliper you'll have to fabricate one and weld it, actually two of them, to the fork.
You can also check here > Custom Motorized Bicycles / Bicycle Engine Kits / Los Angeles| VeniceMotorBikes.com
for an adapter kit.
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Over Youth and Skill & "Charlie Don't Ride"