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Old 27 February 2007, 13:55   #1
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Two stroke oil

I have been running in my new two stroke engine recently, clocking 6hrs at present. Part of the manufactures running in procedure is to add oil to the fuel in addition to the auto mixing of the engine.

Is it considered good practise to continue adding a small amount of oil to the fuel after the running in period, say an egg cup full with every full 25ltr tank?
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Old 27 February 2007, 15:01   #2
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Yoyo isn't the 70HP a TLDI? My owners manual says NOT to run it in with added oil in the tank. But Being i'm in the US that could also be from the inviromental stand point rather then a mechanical.
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Old 27 February 2007, 17:10   #3
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Yoyo isn't the 70HP a TLDI? My owners manual says NOT to run it in with added oil in the tank. But Being i'm in the US that could also be from the inviromental stand point rather then a mechanical.
No, Its the 2 stroke carb 70c model. My owners manual says add oil at 50:1 mix during running in period.
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Old 27 February 2007, 20:25   #4
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I would keep to the manufacturers instructions .
if a 2 stroke runs oil in fuel mix it usually has bigger jets in the carb to cope with it .
hence adding oil could make it run lean at Full throttle wich could cause overheating , and also risk plug fouling running at lower speeds .

that would be correct for a motorbike anyway , can't see an outboard should be any different ?
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Old 28 February 2007, 02:48   #5
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Quote:
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Is it considered good practise to continue adding a small amount of oil to the fuel after the running in period, say an egg cup full with every full 25ltr tank?

That'd probably be a ratio of about 1000:1 compared to 50:1 additional during running in - I can't really see that it would make any difference at all!
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Old 28 February 2007, 06:53   #6
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Quote:
Originally Posted by yoyo View Post
I have been running in my new two stroke engine recently, clocking 6hrs at present. Part of the manufactures running in procedure is to add oil to the fuel in addition to the auto mixing of the engine.

Is it considered good practise to continue adding a small amount of oil to the fuel after the running in period, say an egg cup full with every full 25ltr tank?
It really won't hurt - a lot depends on how you use your engine. Remember many engines these days are running on less oil for the sake of the environment - NOT the engine!!! Many racers run their engines on 33:1 or even 25:1 mix. This is only needed if you run it at WOT all the time - otherwise you will foul your plugs more.

Personally I would extend the running in period for longer - say 3 times as long - and then stick with the normal oil system. You will need more than an egg cup full though!!!
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Old 01 March 2007, 11:30   #7
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Online Oil

Does anyone know if there is a good website to purchase TCW3 from?

The best I can find is 20 for 5 litres of Quicksilver for Marinescene.
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Old 01 March 2007, 13:35   #8
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Depends on how much you are going to use. Rock Oil is great and nice to deal with - they sell in drums and 12x1L packs etc.

http://www.rockoil.co.uk/

Far cheaper than the branded stuff and a quality product.
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