Gilera Runner VXR125 Problem? Help?

Hi there i have a Gilera Runner VXR125

2 problems, its takes a while getting to 60 and struggles to over it when it reaches it, is this rollers? i also have a scorpion exhaust.

number 2, when i give my scooter full revs off pull off it will just cut out and i need to pull off slowly then give it full revs at about 20.

thanks
please help i cannot afford garage work