Carb throat popping at speed, New Problem!!! Options

[LetoAtreides]

Ok, so I know I've posted this before, but I still cant figure it out, and I need to know all of the possible circumstances under which this condition occurs.

One of the throads on my dual carbs is excessively lout at speed. It sounds like pop-pop-pop.

Any ideas?

[ArtechnikA]

Normally I am a very patient person but this has put me over the edge a bit. Someone else better at working through the basics, especially on a T-IV, wil have to take over here.

Leo -

At least part of your earlier popping and your current problem is the mixture trying to explode back through the intake because once you get a real timing light on that puppy you will (I hope) be horrified at what you discover.

Please don't drive it until you get this fixed.

What you are experiencing is called DETONATION for a reason. It is the sound of engine destruction in progress.

You can static-time it "close enough" to be safe with nothing more than a 12V light bulb on a couple feet of wire. A real timing light would be better.

There are A LOT of threads here about how to time an engine.

Max speed at idle isn't in any of them. I don't know where you came by that technique, but it's bogus (at best).