Upgrades for stock engine 30cc.

[Blackout]

Hi all,


I have the stock engine, pretty sure it's the 30cc one.


I wanted to know what upgrades I can do on it to give it a little more power without having to buy a new engine, seeing as I'm considering getting it rebuilt because it's leaking and I just don't have the time to do it myself.


I already have the CPI tuned pipe.


Thanks.