Cold 3-4 Headers

[Nwalker300]

My 1980 Honda cb750F will only stay running if stay on the throttle. It will stall fairly quick once I let off and I noticed headers 1-2 are hot but 3-4 are cold to the touch. I checked 3-4s coils and the boots were stuck open so I figured maybe they were the issue. I put different boots on and now it will idle longer with choke on but still stalls when chokes off and 3-4 headers are still cold. Any thoughts would be appreciated.

 

[cmg]

The first thing I would ck would see if you have fuel in the 3 and 4 bowls. If so, it may be as simple as ur pilot jets are clogged.

 

[Nwalker300]

I have Murray carbs and they are brand new. they are supposed to be synced. I will double check the bowls