upgrades but unsure

[bmcafee]

I recently picked up a agility 50 and decided that i had some extra cash so i picked up a 81cc 50mm big bire cylender and head. I am wondering what size jet I will need with this larger volume and A canister air filter? I was thinking that the bigger cylender would create a bigger vacume and there for draw enough fuel but I am uncertain. any advise of experience would be much appreciated

[Shaka]

I would recommend a larger carb with an 81cc.  You will end up with a tuning nightmare if you try to use the stock carb.  An aftermarket exhaust will really help also.  I've seen overheating problems due to the stock exhaust not letting the hot exhaust out fast enough.