Graham, get the pressure gage installed. Then when she stalls you can check for blue spark~done. Then you can look to the fuel side. Check for water in the fuel by draining some fuel from the bottom of the carb AND/OR checking the fuel separator. The gage would of already let you know if it was pressure related, so if you have adequate fuel pressure we now know it is at he end of the fuel hose~the carburetor. About two hours max
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I'm betting the carb is way to rich as she starts easy without full choke!!!!!!!! Water in the fuel will require a great deal of choking when cold in most cases.
Dave Neptune
