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Guessing not fuel supply. Usually you can open it up untill the floats run dry then it starts to die. This is cruising at 30km/h (no load). I can open it up a little and its fine but its like as soon as the throttle hits 50% (secondaries on carb?) that it just chokes and dies. Like a kill switch.
Split runner would only effect one cylinder?
Carb contamination would also effect only one cylinder. All the cylinders are failing.
at 80km/h its seems fine. Its just hard to accelerate above that with out hitting that magic throttle setting.
Its almost like the spark has got really weak and either high throttle or RPM is blow the spark out. Heavy acceleration causes the mixture to richen which further loads the ignition.
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