I just started working on my ZA50. I am new to mopeds, definitely not a tuner. I wanted more top end, but wanted a setup for an everyday rider. I consulted Nate and Zack Bandit who were very helpful. I'm now in the process of putting on a 65cc metrakit with a 50cc high comp head, Delorto 15.15, and an Estoril pipe. Hopefully more people will post, I'd like to see what other folks are working with