Technical Adjustment of Fuel, ignition and my struggles

I've been working on a 121 ci little banger mill.
I've been working with 2 2bbl Dellorto 40 DHLA on IR manifolds.

I've had some trouble with jetting and the basic behavior of them.

I got this wonderfull little tool bot either it dosent work, or I can't make it work.

Its a little dwell angle, Rpm and volt meter. Does any one know how to hook it up?

I can put the two terminals on the batteri, and measure 12.8 volt.
But other then that I cant get a reading.

I try I'd mounting it between terminal one and the coil terminal 1 (-). No respons.
It shouldn't be that hard.

On a different matter. How do I know if I get the right amount of Fuel?
I'm running a CO of 2 pro cent. Is there a good number to shoot for or am I over complicating things. Should I treat it like a lawn mower.
In til it goes lean, out til it becomes rich, and in the middle it's perfect.

Does any of you play much around with CO value? We have to because of inverement and fuel prices that's true the roof.

 

I also had some issues with my English.
Is stumbling the same as starving for fuel and is bogs/bogging when it get an excess amount of Fuel and can't burn it? And what's surging?

The exhaust temp is an way to indicate if it's running lean, but what is hot for exhaust gas and what good?

I've been surfing the World Wide Web for info on my carbs, but what I find is very complicated. And takes two readings to understand. But most of it I get eventually.

Does anybody have the des Hamilton Dellorto/Weber book? Is it any good?

 

Have you checked your Multi Meter for batteries? (here in the U.S.A. most of ours are powered by a single 9 volt)
If the volt meter registers when hooked up to your 12 volt source, the meter is operative.
That would indicate your power inside is defunct. (battery dead, or not installed)

 

Let me try and help, sit in a rocking chair and let your neck get relaxed then rock, when your head flops back and forth that's surging or that is how it acts when you drive it.

Stumbling is lite stuttering, tries to go but can't then finally gets it right and goes. Like this, "look at that CaCaCaCat."

Bog is like when you give it the gas and it seems to slow down not go faster. Run toward the water as fast as you can then when you hit the water keep running, you bog.

Any of the above could be a fuel problem or an ignition problem. Sometimes when your carbs are too big and you open them all at once you bog because the fuel cannot me pulled through the siphons fast enough and you flood the engine with air. On an IR you have to think differently then with a plenum type of manifold, you want your carbs to be oversized, the venturi becomes your buffer against pulses in place of the plenum, but you have to jet accordingly or when you snap it open you will bog.

its a can of worms, LOL you just have to keep trying until you get them untangled.

 

Hey Mike.

That makes sense, but why would it have the two battery terminals and the other two wires connected to a piece of copper?
It look like it's meant for external power and the two wires and copppee is a pick up.

But I can't figure out how to connect it.

 

It is solid state and the circuit board and it is or at least part of it is 9V, 12V would be too much for the part that actually meters what you are reading.

For dwell you connect the hot wire to line voltage on the battery, earth gets grounded, I usually use a clean part of the engine or ch***is, and the final wire gets connected to the distributer side of the coil. it will measure your dwell angle with the engine running.

 

Hey PnB
I tryid that, no luck.

It isn't a third wire per say, more two read and two black.
One red and one black is connected to a matching red and black crocodile style connectors. Them I have no doubt about how they connect.
It is the last two wires that are connected to a 3 inch long piece of thin copper plate. About 1mm thick and about and 8mm in width and got both wires soldered on a good half inch from upper-side ends.
One end is square, the other has a small "fork"end and 3 5mm holes in it.

I connected two small pieces of wires to upper-side ends, and slid it between the terminal and connector on the ground(-)/minus/trigger side/terminal 1, and it did nothing!

Still can't figure it out how it should work?

Maybe it works like a trigger on a ignition pistol, and the copper needs to be connected to a spark plug??