[mike721]

If the bike is revving up but the speed isn't increasing your clutch is probably slipping, this can either be a simple adjustment or need a new clutch. Adjust it first for sure, especially if you haven't adjusted it in a while, this may very well be all that's wrong.

Googling adjust V star clutch will find you plenty of help on how to do it, this is one of them, there are more including videos available.

https://www.manualslib.com/manual/659411/Yamaha-V-Star-Xvs650s.html?page=60



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[mike721]

Sounds like a clutch adjustement is needed. Let us know how it works out