Zhongshan won't start???

[alan566]

It just died ridding down the road. It's getting gas, I changed the spark plug and checked to see if it was firing and it has A very faint spark. With the battery fully charged the plug out and touching a head bolt I could barely see a spark. When trying to crank it it doesn't hit at all. I know the gas is good and the old plug was saturated with gas when I pulled it out.
So what would let it have a faint spark but not enough for it to run? I checked the spark at close to dark, I probably wouldn't be able to a spark at all in the day. In the past with the plug out and on the same head bolt you could see and the pop of the spark so I know the plug is grounded good.
Also The CDI looks fine, it's not swollen or anything. What should I look at next? The ran fine then all of a sudden it died. Thanks Alan