The primary strategy of the race is to not break. In most cases, if you break something, you’ll lose too much time to make it up.
The last time we raced it, which was a few years back, we reinforced nerf bars, had quick change brake pads, fresh tires mounted on hubs so they go on quickly, safety wired everything we could, used double brackets on anything possible, and so on. Keep the kart together first, worry about going fast later.
One issue with the Rotax is the battery life. I know there are people out there who used special batteries that would last the entire race, but someone else will have to chime in with that info.
I think 2 sets of tires will last the race.
I think the fuel tanks will hold enough for about 50 laps, so figure your pit stops from there.
Good luck and have fun.
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