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4

These symptoms are typically caused by one or more blocked jets in the carburettor. Small particles of grit can block any one of the jets in carburettors. The fuel still gets to the engine through the other jets but the efficiency is much degraded. The number and size of the jets varies by model. I have no experience with Yamaha motorbike carbs but I ...


1

If the float was sticking you would see black smoke when it stumbles and would clear up when its pinned.You're right with the acc. pump, would be a consistent flat-spot, but check for a steady stream anyway.All little things add up, so if points, plugs and ignition leads are not 100%, start there.


4

I assume you mean that when the engine is cold, it requires the choke, but then if you stop and try to restart, then you have to turn off the choke. This is by design. The choke is a tool to allow a cold engine to run by enriching the fuel/air mix through restricting (or choking) the air supply - once the engine is warmed up, this is not needed any more. ...


1

Replace the float as well. Sometimes depending upon what material it's made the float can be somewhat soaked with fuel changing the weight of it.



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