so i want to buy a big bore kit for my 2013 aerox but not sure how many miles (ish) it will last and how much faster i will go and if its worth spending lots of maoney at it. i am wondering if this one is worth it: https://www.ebay.co.uk/itm/70cc-Big...m=161974660182&_trksid=p2141725.c100338.m3726 my aerox currently has a 70 jet with stock 12mm carb and a http://www.pedparts.co.uk/product/474/standard-yamaha-aerox-exhaust derestricted exhaust.