Ok I went to my moped guy, Larry's house ..he's an old retired car mechanic that tunes up peds for fun. A really great guy and quite a character.
Before I went over I took my carb apart. The jet in my carb was a 60. We poked through a pile of stuff and found a 58. When I got home I put it in. The bike runs great and plug chops are tan. Top speed is ~34. And Chris I had taken the airbox apart and cleaned it and the metal mesh filter.
The main point that I was trying to get at is:
Will a moped theorhetically go faster with a larger jet and no airbox, than a ped with an airbox and a propererly jetted carb? In the first case the engine is getting the maximum amound of air and fuel, and in the second case it is getting the same ratio but less mixture. Is it the ratio that counts or the ratio and the amount?
Also when I swapped my jet from a 60 to a 58, I noticed something wierd. The jet in my carb was very small, about the size of a pencil tip. It threaded out with a screw. The jet I got at moped guys house was really big, and long. I had to remove the lower piece of the jet with a ground down socket wrench.
Whats the difference between a two and one piece bing carb jets?
Also does anyone think that enlarging the air port of the carb would allow me to put in a larger main jet or would this be a waste of time.
Thanks for reading all this. I tried to make sense but if you've got some questions let me know.