sorry atm jsut a fully stock yx150 stock carb stok head stock bore all it has are hd clutch plates and springs and the power is very flicky (on off ) and when i had the v2 head 177 bore and oko 28mm d slide carby the power seemd alot smoother, i was wondering if it was the v2 head or what ? cheers and sorry again 4 my crap desctiption b4