Yamaha 15hp 2 stroke oil mix ratio

Davjon · 24 July 2013, 20:14

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

Perroboy · 24 July 2013, 20:19

50ml is 100:1

camelgas · 24 July 2013, 20:54

^^^^ agreed.

joey_1987 · 25 July 2013, 08:35

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.

Davjon · 27 July 2013, 19:56

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.

Poly · 27 July 2013, 23:06

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".

Nos4r2 · 27 July 2013, 23:19

Quote:

Originally Posted by Poly

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.