Fuel tank pick up and antisiphon valve

[BRIELLY]

Plugs are new and still look clean. The carbs were completely dissasembled, cleaned and put back together. I'm thinking ignitio now because it has run well at times even beforethe carbs and fuel pump were rebuilt. Now that I can see there was no real fuel restriction I'm leaning toward ignition. Unfortunately i just don't have the time to screw around with this thing. There's just too many possible problems. I think it may be time to let a mechanic look at it.