i got a nrg mc3 2003 air cooled scooter and got a hebo performer exhaust for 40 pounds second handhand i really need to know what weight rollers to fit as it only crawls along unless i go down hill i also got a stage 6 air filter but dont know if it worth fitting on standard carb and its got a sound from transmission case wen riding that sound as if the belt is rubbin against somthing it did it with original exhaust too i dont want to ride it at the moment incase it breaks thank for any help

craig, October 2009

i took the case off 2day and pulleys and belt r fine and i realised the rear wheel is really hard to move so i loosened the rear brake as far as it would go but still its hard to move so i think its the gears and the shaft the clutch is on moves side 2 side a little so i think it to do with that as for the roller weights im going to get 4.5grm will these be too light and how mutch r a new set off gears and will i b able to fit myself?

craig, October 2009

check belt is not damaged.check pulleys are tightly fixed.you will also need to put bigger main jet in.but i dont no what size.

rayb, October 2009

i will take cover off wen it stops raining but what should i b checking for and do u have any idea as to the roller weight as i currently got original ones in

craig, October 2009

take engine cover off to see what is causing noise first.

rayb, October 2009