Help with a Yamaha

Let me ask will it rev with choke on? if so
I would start with checking the rubber o rings that seal the intake to the head.

I actually tried this and it just caused it to die all the quicker. I will be done with checking all these suggestions in three or four hours as I am doing three other vehicles all at the same time. Hopefully one or a combination of some of these ideas will cure this, and I will post results.