Belt breaks and now runs rough starting from stop.

[italianmotofest]

Ok, 2006 CF Moto 250 V5. I just got this in a bike trade. The PO said that the belt broke and when he replaced it the bike will not start from a stop very well. Shakes and shudders until about 10mph. Then it runs very well.

Kind of a neat little bike. 18,000 miles.

I'm an experienced motorcyclist, but I don't know much about the CVT transmission.

Any suggestions?

Thanks!

Bill