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Two things spring to mind- either you have a bad coil or a carb problem.
If the bike has been standing for a long time the pilot airways can become blocked with crud from evaporated fuel. THis would lead to a rich mixture at low throttle, not a problem on a cold engine but getting progressively worse as the engine warms up.
When the bike is hot, try (briefly) touching the header pipes in turn. If one is considerably cooler than the others it will indicate the problem cylinder.
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"You can't fly with the eagles if you keep scratching with the turkeys."
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