Yamaha MBK Nitro

Hi, First of all i will apologise for my amature knowledge of scooters but we have to start somewhere.

I have just recently purchased a Yamaha MBK Nitro 100cc 2 stroke.

It has new carb, piston, airfilter, a racing exhaust, new drive belt and i am not sure if the rollers are new but i think they are 12 grams.

Theres not a problem starting her. Starts first time! Kick and electric.

When pulling away she is REALLY slow until she gets into the second gear then she pulls away nicely

I need help to try and resolve this problem as it is doing my head in and obviously going to be p*ssing other motorists on the road especial ones behind me.

Could the reason be that the new piston needs to be run in?

Could the rollers be to heavy?

The belt needs to be used a little before picking up the pace?

Any ideas how to get some acceleration from my baby?

Thanks for taking the time to read this!

Danny Boy =)