The question itself (poncho or parka) suggests an unfamiliarity with 1. motorbike riding, 2. rain, 3. ponchos. There is no way you could ride faster than a slow crawl in a flapping poncho, and no way the rain would stay out. The only question in my mind is how long it would take before the poncho caught in your wheels or chain and ended the experiment: One block? A couple of miles?
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