Could be a whole host of reasons, m8. Have you been on v6clio.net and asked on there? Unless there's something obvious like a low pressure on one of the front tyres, I'd have a quick check at the rear.
Anything that puts the rear out of sorts such as a damper that's gone or split spring will invariably make the front end more 'sensitive' and feel light. I had some right random front end issues going on when driving mine after one of the rear dampers went. Having said that, it wasn't rocket science to work out. One damper pissed all its oil out down the shaft and it banged like a b*****d on bumps - lol!
I can understand how you would have noticed a change though. The steering sensation on a Vee is as smooth as silk through the wheel, compared to a 1*2.
D.