SOURCE: enith carburetor diagram
Nobody has messed around with the ignition timing in any way?
If it has stood for a long time(i.e years..) the fuel may have degraded to the point that it\'s useless.
The carbs will smell of fuel, but are you sure that fuel is being pumped to them in sufficient quantity? Try disconnecting a fuel line, crank the engine a few revolutions to see if fuel is pumped out.
Try gravity feeding the carbs. Use a can of fuel connected to the carbs, held above the engine. Get somebody to crank the engine and see if it fires up. If the engine fires up, suspect the fuel pump.. or fuel lines.
An air leak can also cause non-starting. The usual cause is the inlet manifold gasket. Any air leaking through the gasket can cause your non-starting problem. Go back and check that no dirt has been picked up by the gasket before you fitted it/it hasn\'t been ripped. Check that the inlet manifold has been correctly tightened.
It doesn\'t sound as though you have much of a problem .. more of a \'niggle\'.
The link is for Zenith carburettors:
Zenith carburetor Google Search
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