Well, I took off the new Mikuni carb and replaced it with the original carb that I rebuilt a couple months ago. I kicked it till I was blue in the face! Nothing! Then I took out the outside spark plug and tested the spark, sparks beautifully! I then moved the spark plug wire to the outside spark plug and walla, it started right away! It ran for about 2-3 minutes very nicely so I backed it out of the garage to take a ride. I didn't give it enough throttle in first and it died. Never could get it started again! So, it's like the bike is moody! I don't understand how it can quit, and never pop again after running for a few minutes...

Bad spark plugs?
 

I test them, they spark beautifully! That's what's driving me nuts!