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Brian

2 stroke oil

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hehe i can answer this one :dance

When i had my little 50HP two stroke outboard, i thought i would buy the best synthetic motor bike 2 stroke oil on the market.

It had a holding tank on the otboard, so there was no pre mixing.

It used to get through loads of oil.

When i had it serviced, the service guy said that you must use Marine grade 2 stroke oil as its thicker than the synthetic motor bike oil.

THis was why i was getting through loads of oil.

So if your outboard mixes it automaticly, then use the marine outbaord oil ( i found it cheaper than motorbike oil )

If you pre mix it in the petrol tank then any 2 stroke oil will be fine.

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Yes, it is designed not to "whisker" the plug(s) at the lower temperatures that O/Bs run at, has better anti corrosion properties and will not seperate as readily over time and produces less carbon build up. May I suggest you buy one from a recognised brand that conforms to TWCIII if not buying the one marketed by your O/B manufacturer. :-D

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It’s not really that they are water cooled per se Pete, more that they are raw water cooled, the same goes for inboard engines unless they are via a heat exchanger then they run at the same temperature as a “normal†land based unit. This really shows it’s self when you connect either a calorifier or a heater matrix to a raw water cooled motor, the difference in efficiency is remarkable, I even went to the extent of fitting a fresh water cooling kit to our last Mercruiser for just that reason.

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