You don’t say fresh or salt (assuming fresh)? or what year/model JB?
- 1 bilge pump is like none (they clog/fail): install a backup that is float activated and not always on (like the OEM resistance switch one, that test runs every minute or so and if it feels water, then it runs until it feels no resistance). Plumb the backup separate to avoid back-flow or over load of two pumps into one through-hull port.
- Can you get shore power? Depending on your power situation... a solar battery tender may be required to keep everything charged as needed (for the bilges of course, and to start the engines for your days out on the water).
- You may need anti-fouling paint? At least a super wax job with the type meant for your water and leaving it in. Spray Wax (motorcycle chain wax works well) all the metals of the jet pump (take off or cover the zinc so it does not get coated by wax). You will probably have to haul it, power wash and scrub and clean, then wax it again, multiple times a season.
- Zinc anodes appropriate for your water (salt requires different than what is OEM on Yamaha, magnesium I think?)
- Flush shutoff / emergency tow valves to shut off the raw water intake from the jet pump (must if you are in salt trying to flush engines with hose water while in the water), and helps run salt-away through the engines. Either way using these for flushing seems to make the hose water flush way more efficient and effective. And I would shut them off if left in the water ... another through-hull “sea cock” that if not needed should be off (and make sure you open them to run the engines and get underway).
- Triple check all through-hull fittings (on land, you can fill bilge with water up and look for leaks). I have seen water come in through the intermediate bearing seal area at the joint to the hull, and around the impeller shaft “tube” (near the clean out ports). There are a lot of below water through-hull fittings that must be checked and resealed, and tightened, if needed.
- Excellent mooring cover (is it covered in a boat barn ?), and vent the cover with a solar fan or adequate waterproof vent system.
- Probably don't want to leave carpet or other water trapping material onboard.
- Also, you may seriously want think about not leaving it in water for long. Maybe use ramps or an air dock system that can lift the boat up out of the water. The investment in those like
Boat Lift Manufacturer of Boat Lifts and Docks ( I see these heavily used on salt areas with jet boats in slips), or any lift that would work in your slip situation ..... may be something to consider after you see the cost of leaving it in water. (my 09 AR210 previous owner did for one season in a lake, then stopped ... and gave me a ton of lessons learned from that experience).
