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.
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