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I'd also suggest changing the sparkplug caps,(they unscrew from the sparkplug wires) and the sparkplug wires. Most car speed shops sell 7MM sparkplug wires by the foot, others may have kits.

If the plug wires are sealed to the coils,I'd use this: Z1 Enterprises, Inc. - Product Catalog to add new plug wires to old ones.

Another place to look if you think it's carb problems would be the input votage to the ignition coils. Low voltage will result in black carbon fouled plugs having you tear down and play with jet sizes.

The website wiredgeorge motorcycle carburetors - Vintage Japanese Motorcycle Carburetor Sales, Rebuilding and Restoration - Home shows a simple wiring modification that bypasses the aged wiring in these older bikes. To see if your bike could benefit from this, do this:

1.Fully charge the battery.

2.Remove the gas tank.

3.With ignition switch in the on position and the run/stop switch in run.

4.Use a mutimeter(Digital or Analog) check the primary side(small wires) of the ignition coils.

5. If it's down around 7-10 volts, your bike is suffering voltage/current drop affecting the spark energy.
 

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Navy Vet Search & Rescue
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It's running straights pipes without mufflers & the air box was revoved & it's running with 4 pod type air cleaners.
You should be able to get the proper jetting for that setup with the original carbs. It takes some work and trial n error testing but thats going to be the case no matter what carbs you go with.
 
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