Ok , so ive decided I would like to upgrade my chinese 50cc 2 stroke engine. Its all stock as i bought it, and does Max. 27mph until the engine sounds like its had enough. Im mixing 16:1 for this last tank of gas before i go to 25:1. Ive ordered an NGK Platinum plug. I would like to also upgrade the Air Filter and Muffler but cant find any dealers online that sell any. Only thing i find is Pocket bike upgrades. Can I get some recommendations on those or any other easy upgrades that will increase Smoothness and speed to my ride? also, whats the max that i should expect to get once i remove my Stock plug and put the NGK one on? i ordered the NP6HS plug. 
