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(In truth, it’s probably good idea these days to use a fuel stabilizer at every fill-up, all year round!)įor 2 stroke engines, while the engine is idling, spray fogging oil into the carburettor. Modern fuels do not store well, even petrol for 4-stroke engines cannot now be left untreated in the tank over winter, so the first job is to add a fuel stabilizer to the petrol. At the very least it could save ruining a precious day on the water! One of the advantages of using an experienced, conscientious outboard engineer (our own is excellent) is that potential faults may be spotted early, before they become serious and expensive to rectify. If you are not confident after reading this guidance, then please, please, use a reputable service engineer to do this work for you. But if warranty isn’t a concern, and you’d rather do it yourself, then hopefully you will find the guidance below useful. If your outboard motor is still under warranty, then it is probably better to ask your service engineer to service and winterise your outboard (ideally at the same time, every autumn) thereby preserving your warranty. So, how do you go about winterising an outboard motor? There is little doubt that poor maintenance does more damage to outboard motors than high usage, and failure to properly winterise an outboard motor can result in serious, possibly terminal damage.