You would most likely need a boosting partner for this.
Go into Multiplayer / Online Multiplayer/Create
Superbike (Norton V4 RR)
Other Track: Milford Street Circuit (2.50km)
Once in lobby hit RB to change map/lap settings (1 Lap)
LB allows you to change bikes. I choose the fastest bike in game listed above
1 win for each, took 6-8 mins total