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There you go Noise, that rusty old lump your repairing came in handy after all.

Looks like me on one of those cold days when the draught gets right under your visor. You try really hard not to lick your lips but...

Generally popping on the over run is air getting into the cans and igniting the unburnt fuel. I would sort out the fueling at low speed first as it sounds like its rich and as Noise said get a pair of baffles, apart from reducing the noise they will help reduce the air coming in..

I cant help with the parts but I'd change the name on the tank.