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my gilera runner has had 70 cc kit but wont reach top speed?

my gilera runner 50 cc has had 70cc kit added it accelerates very quick but reaches 30 to 35 miles an hour then bottoms out and wont go any faster can anyone help
tom, August 2011
Up the main jet size, lighter rollers....

Ted, August 2011
link Click here to see other fixes for Gilera.