crankshaft for Piaggio Zip SP


hey guys it's been a while since i posted, i am here looking for advice as to what crankshaft is the best for Piaggio Zip SP under 100 euros.

i am helping my brother upgrade his Zip SP to a 70cc midrace setup, so far we have a Stage6 70cc Sport Pro kit, we're trying to build a cheap, reliable but fast setup for both street & some track use.

do you have any recommendations for the exhaust pipe as well, just go with the Stage6 Pro Replica or run a Yasuni R or City16? remember we are on a budget here. thanks to those that can give valuable advice.

i'm a minarelli tuner so i'm not quite familiar with piaggio scooters, this will be the first piaggio scooter i will be tuning.
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