Loosing fuel supply at 10k rpm

[Graham Walker]

Bike Model = : Aquila Gv125 2007

Further to the tick over issue mentioned previously I now have other issues even when I have fitted the larger fuel pipes and filter. Yesterday I took it out for a spin and had problems to maintain 10k rpm at 50mph on a level road. Bike eventually came to standstill out of fuel to the carburettors, took a while cranking over to fill the carbs. Restarted no problem at 7k rpm seems no problem to run. What might be causing fuel starvation. Been here awhile ago same issues, tried running with fuel tank open makes no difference, have also fitted a new fuel pump, could I be loosing vacuum at high rpm which would close off fuel supply?
Fitted new ironing to inlet manifolds as stated in my previous posts.

[♠️ M77]

Did you get a can of carb cleaner and spray the airbox outlets that swallow the carb and also spray the intake pipes attached to engine cylinder heads for any revs changing ?

Possibly a loss of vacuum under the engine intake pipes where the O-rings are  (there is o-rings that sometimes need changing) , tedious process as its awkward to remove the airbox but fortunately forum has 2x tutorials to make this a whole lot easier.   Check the Air Lines thats feeding the pump for cracks ?

Large fuel lines would just hold more volume inside which is what you want , then more fuel is readily available as soon as the floats open inside the carb.

Did at any point the carb got opened to change jets ?  Micro dust particles have entered the carb before closing up?  or is there a chance the floats got bent even if it’s just 1mm off    (see this link below to check float height as it directly affects how much fuel the carbs have before it shuts off , too much adjustment will simply leak out of the overflow or drown the engine – be cautious.     or look at possibly jammed floats not opening fully?)

GT125 2003 Performance Issues

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