G2Revolver - NightRider

So it looks like me, Tom, Rone and Rupert are entering the G2 Revolver NightRider on April 19th at Sherwood Pines. Tom reckons I need to average 18mph for 2 laps. I think he may be a little optimistic. Not sure I could average 18mph downhill but will give it my best shot. 

Right, where did I put those carbs?