Re: what did you do to your motorized bicycle today?
I have a drill set with a pen type drill handle, the solder and drill method is what I do also. The one thing I have learned is everyone of these engines are different, what works on one may not on the next. On my 48cc with the cns2 I'm at a 66 drill size, that's where the plug color got right. On other bikes I've tuned the stock jet (71 I believe) was OK. These things are very simple, that's why they drive us crazy!
Your results may not be the same,Greg