Hey everyone I'm new to the forms as well as pocket bikes, but have some general mechanical know how. I purchased a pretty beat up X19 off craigslist for $125.00 seemed like it was a decent purchase because I got the motor turned over the first day working on it. The seller apparently was having major problems. Anyway I have some extra cash laying around and would really like to make this thing quick. I need help on what upgrades I should perform to the motor or if it would be more practical to purchase a higher cc. It's currently a 110cc I've found this 125cc big bore kit http://www.ebay.com/itm/171945681618 would this add significant speed/torque? btw I'm 6'1 200 pounds just for note. Im also planning on installing this carb http://www.ebay.com/itm/13163287115, an oil cooler, extended swing arm, full exhaust, aftermarket cdi, and spark coil. Id like my top speed around 65-70 and snappy acceleration. Any advice please feel free to post below.