Reply To: [Solved] Struggling to get past 45 mph Aquila GV 125 2004
before refitting, did you consider replacing the intake manifold rubber O-RINGS , as these are known to cause hidden leaks causing all kinds of boggy behavior . If fitted already, spray carb cleaner around the intake pipes to see if revs change ?
Does it start without choke when its ice cold ? its a small tell tale sign if things are good under the hood, and normally it should not need it heading in to summer now.
To rule electrics out, check this link below and report back with your figures?
Rectifier – How to Test Stator , Battery , Regulator – GT125R Carby