At speed while accelerating, getting sudden lumpiness/surges. I suck at describing things so best to see the video, if you watch the tacho the revs nose dive then bounce about briefly. I didn't notice at the time but watching the video noticed a high pitch noise comes from the bike when it happens.

It's only happening at speed. Can anyone confirm this is carb icing? or do I need to start tearing stuff apart.

https://www.youtube.com/watch?v=OAb7...ature=youtu.be