Found this info for you with base line carb setup.
I run a Leopard and have no idea on a Rok. If it helps, my water temp is avg around 140 and just hit 152 last weekend. Temp seemed really high, so I confirmed with friend running Leopard with stock rad also. Flex with a Leopard goes this way, the longer the flex for more top end down the straight (correct me if I’m wrong), so I’m not sure if I would put a longer piece in for a tight track. If you have an on-board starter then you wouldn’t need an external. People like to save the battery and starter brushes for when they really need them or a spin on track. I use mine all the time since my dad isn’t at every race with me. Hope this helps.
Tony Kart / Leopard