I was going to pick up a 410 chain today just to see what kind of difference it would make, but when I looked at it in person, that thing was tiny. So I ordered a standard 415.
I took the moped for a ride today since the weather is so nice. After porting the exhaust port, I seem to have lost a bit of low end, although I did pick up 2mph on top end going downhill. I also dropped the jet from a 66 to a 64, since it was running rich. I still need to pick up a new needle and a few other little things to finish getting the carb from restricted 1hp to unrestricted 2hp mode.
Next paycheck I'm also going to get the 50cc treats cylinder/piston kit and a Hutchinson GP-1 rear tire, since they're some of the lightest ones. Undecided as to what size I'll run on the rear. I really like the look of the 2.75, I may just stick with a 2.50 for better performance though.