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how can i fix gilera dna 125 holds back on full throttle?

hi my gilera dna 125 4 stroke somtimes on the flat losses power but keep running and always on hills will only do 25 to 35 mph with throttle open how can i fix it thanks
rob, May 2010
it will rev on the stand fine but up hills it looses power

rob, May 2010
so if you rev it on the stand it will rev out for a few seconds then just die down to tickover speed even with the throttle still wide open ?

adam bike doctor, May 2010
no it goes to tick over and after a couple of revs it picks back up and goes again

rob, May 2010
it sounds like it may be running weak ,does it run the same speed if you close the throttle a bit?

adam bike doctor, May 2010
link Click here to see other fixes for Gilera 125.