It's basically always the Phoenix though. You do need to master the bike to get through Hard and certainly Extreme so really no point in insisting on using the Scorpion.
I'm certainly no Trials pro but since no one else answered, I guess they're bunny-hopping? Left and then immediately right at the top of the jump.
I am terrible at the game for the most part but after just using the Phoenix online it just feels weightless..