On a Sea Doo jetboat, what does the red lever(s) do that is located beside the throttle?

[Jonathan C]

Is the black one the throttle?

[denny m]

On most schitbox seadoo jetboats, they have one or two (depending on how many engines) throttles and a "gear shift" lever for forewards, neutral and reverse.Some of the single engine sportsters had a short stub** trim lever as a futile attempt to gain some added performance and stop them porpoising.The best thing to do with any seadoo jetboat is to remove the engine/s, put them in a pwc where they were designed to be and install a modern pod mounted outboard. This will halve your fuel consumption and add performance everywhere. Or burn it and buy a real boat.