[goatman]

The first thing is getting the jets set so that it runs well under full throttle, then tuning the metering rods and any power pistons to run well under part throttle conditions. would read up a lot on carbs and order a tuning kit. It takes some time to get right, but a proper carb will run very well.

 

[goatman]

You either have too much pressure while running or the carb is leaking down through plugs in the fuel bowl if that no start condition happened