I've learned something that might be of interest. Fall has arrived here and the temps are in the high 40s to about 60. With the 25/1 mix and new engine I found that a hotter spark plug, NGK B5XXX runs much better and warms up quicker. Part of the trouble I was having with the burbling and stumbling was that my rides were too short and the engine wasn't getting warmed up all the way. (And the mixture is still a little rich, but that's ok for now.)
I also put a Lightning CDI on it, mostly to get the advantages of a hotter coil. I tried a gap of .032 and it ran ok, but it starts better at .030.
NOW I can get it to break in. It's got to have some time at full operating temp to do its thing, boys.
For those interested in the things, the Lightning CDI hasn't increased my top speed (it isn't the spark that's holding this one back) but it does seem to pull harder off idle, run smoother and a lot less sputtering. I like it fine.
A bigger coil can't hurt anything, and the Lightning CDI comes with a nice one. I used my old spark wire with it (SBP supplied) since it never interfered with my Speedo and is the right length.
Anyway, a hotter plug can get her warmed up quicker when it's cool outside, and the bike runs much better.
We hit 26.7 today without even trying, and cruised all over at about 21.
It pulled up small hills with ease, I think it's going to be a good little engine.
One last thing- if you see little pits on the end cap of your spark plug, those are caused by not having your spark wire metal piece not fully down on the plug. Ask me how I know..