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Old 24 July 2013, 16:14   #1
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Yamaha 15hp 2 stroke oil mix ratio

Hi I have a 1996 Yamaha two stroke engine which is 100-1 I believe oil to petrol mix ratio can some one please tell tell me how much oil I need to mix to five litres of petrol

Thanks Dave
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Old 24 July 2013, 16:19   #2
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50ml is 100:1
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Old 24 July 2013, 16:54   #3
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^^^^ agreed.
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Old 25 July 2013, 04:35   #4
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Some believe the 100:1 thing is marketing, or maybe Yamaha actually did/do something differently. Not saying either is right, my advice would be if using 100:1 to ensure you use a good quality oil- Yamalube would be my choice as it's made to their specification.
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Old 27 July 2013, 15:56   #5
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Thanks feel silly now should have worked out its just 10ml to 1litre
How ever did get the mix wrong when out and only added 5ml per 1 litre engine was run on this mix for a couple of hours hope I did not do an damage.
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Old 27 July 2013, 19:06   #6
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Davjon, you've probably "got away with it" if nothing bad happened but you were running at 200:1 which is incredibly low - some people think the 100:1 that Yamaha recommend is bordering on too low. Not sure what the experts suggest - but my gut feel would be to run it on 50:1 for a tank of fuel to try and replace the lube you've 'lost' by using 200:1. Some people would prefer to run it at 50:1 all the time "to be safe".
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Old 27 July 2013, 19:19   #7
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Quote:
Originally Posted by Poly View Post
Davjon, you've probably "got away with it" if nothing bad happened but you were running at 200:1 which is incredibly low - some people think the 100:1 that Yamaha recommend is bordering on too low. Not sure what the experts suggest - but my gut feel would be to run it on 50:1 for a tank of fuel to try and replace the lube you've 'lost' by using 200:1. Some people would prefer to run it at 50:1 all the time "to be safe".
If he's got away with it, he's lucky. No need to run with extra oil in-there's no benefit to it.


However, the only person I ever remember telling to run one a 100:1 motors on 100:1 is too dim to understand how to work out 50:1. (regulars will know who I mean)

50:1 is what was recommended for those motors when they first came out. Nothing changed with the motors apart from Yamaha having to meet some eco targets. 50:1 is preferable, unless you're idling/running slow for long periods and could get oiling up problems.
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