tbh i've found the various biking forums on facebook by far the best way of selling stuff,think motoforum will be finishing soon,looks ike the the guy ruinning it (lukewarmbeer) had left it to it's own devices now,and it doesn't get anywhere near the traffic it once did,shame as it was the place to go at 1 time to sell anything race/track related.
if your on f/book but not on any bike groups,add yorself to a few and get the bike up on there,also marketpalce on fbook,as lots of bikers look on there,plus it gets linked to all the other forums/groups your a memeber of,so 1 advert will do them all.
but as Ry says above,your up against a lot of other,newer bikes.