Recently I went up against a friend of mine who was running elder jet bikes. I was wondering what people use to deal with them in their Ork arsenal.
The problem I found was that they were much too fast. There was no way I could get them into close combat. So the problem is, is that orks (in my experience) have very unreliable shooting.
All that comes to mind is a large squad of lootas. Without going into the pros and cons of them I think their biggest down fall is they need LOS. Bikes can jump out of the firing lines in the assault phase. Or one of the Mek guns. I'm not sure of the stats etc but I'm sure theres some sort of barrage in there.