Your scooter has spent the winter dry, rotors removed and greased, battery resting. The first sunny weekend arrives and the temptation is to pull it out of the cupboard, charge it and go. That is exactly where half of all early-season failures are decided: not in the water, but in the twenty minutes before it.
Here is the recommissioning, in order. It follows what you did in the autumn, point by point — in reverse.
1. The rotors: wipe the grease off, don’t leave it on
The grease applied in the autumn did its job: it kept corrosion away for six months. But it has another property that is easy to forget — it holds on to sand. Setting off with the winter coating still on means creating an abrasive paste on your very first outing from a beach.
So wipe the grease off with a soft cloth, refit the rotors, and turn them by hand. They should turn freely, with no stiff spot and no dry noise. A stiff spot that wasn’t there in October deserves attention before the water, not after.
2. The battery that slept: the question isn’t “is it charged?”
A lithium battery discharges slowly even when switched off, and winter is long. The right question is not whether it still shows a charge, but whether it holds one.
Two steps are enough: a full charge at room temperature — not in a 6 °C garage, not in direct sun — then leave it for 24 hours and read the level again. A battery that has visibly lost charge in a single day of standing still won’t let you down at the jetty: it will let you down three hundred metres out.
Sublue batteries recharge in 2 to 3 hours depending on the model. If the first charge of the season takes abnormally long or cuts out, that is a signal, not a quirk of the charger.
3. The seals: six months without being compressed
This is the three-euro part that costs a motor. An O-ring that has spent the winter dry hardens slightly and loses flexibility. Lift it out of its groove without a metal tool — a fingernail or a plastic tool — and run it between two fingers along its whole length, looking for a cut, a flat spot, a rough patch.
Then clean the groove, not just the seal. That is where the salt from your last September outing crystallised, and a single grain left at the bottom prevents even compression. A thin film of silicone grease, and refit. Thin: a seal drowned in grease slides out of its groove when you close the compartment.
4. The contacts: look for green and white
Wipe off the excess contact grease applied in the autumn and look closely at the terminals. A greenish deposit or a white powder means moisture got in anyway. It can be cleaned — but you want to know before switching on, not during.
5. The first test belongs in fresh water
This is the step almost nobody takes, and the one that pays best. Before the sea: a pool, a bathtub, any container deep enough to submerge the unit.
Submerge it, leave it two minutes, take it out and open the battery compartment. You are looking for one thing only: a trace of moisture. If there is any, you have found it in ten centimetres of fresh water rather than in forty metres of salt water.
While you are there: try every speed — two on a Mix Pro, three on a Navbow — and check that the trigger responds each time. One speed that won’t engage means a trip to the service centre in April, not a ruined summer.
6. The app, the pairing, the screen
On the Navbow and Navbow+, the screen shows speed, remaining charge, mode and timer, and the unit connects to your phone over Bluetooth. One season without use is enough to lose the pairing or miss an update. Restore the connection at home, calmly, rather than on a pontoon with patchy signal and water everywhere.
The three recommissioning mistakes
- The pressure washer, to “clean off” the winter: it pushes water through the seals instead of cleaning them. A gentle stream of fresh water, always.
- Going far out on the first trip. The first outing of the year is for checking, not exploring. Stay within swimming distance.
- Charging just before leaving. A battery charged the night before and read again in the morning tells you far more than one plugged in thirty minutes before departure.
Twenty minutes at the workbench in spring, and the unit sails through the season. It is the best time-to-peace-of-mind ratio of the whole summer.
