Gilera stalker drag

Hello this is my first post i have a 2000 gilera stalker when i get to about 20mph and i can feel it draging it feels like the back brake but i no its not that as i took it off and still the same its more like a on off drag sort of thing if u need any more info just ask me thanks.

P.S can some1 tell me why petrol is going into my airbox thanks.

 

what rollers are you using? those would be the first thing i would check for the 'dragging' problem

 

hello it has original rollers in you can feel it like every 3-5 seconds when your moving you feel the back end drag thats the only way i can put it.

 

have you opened up to check the variater possible they could be worn and out and no longer rounded this is just a possibility im not sure

 

i would give the whole transmission the once over....variator/rollers, gears/oil clutch everything. your problem is most likely gonna be something to do with the transmission

 

it has a new clutch,rollers,belt and new transmission oil.