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Two stroke fuel ratio


Johnkv
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I'm sure this discussion is here somewhere I'd appreciate if someone could direct me to it or give me your thoughts on the following....  I run a 500i ,I usually run 50:1 with aspen 4 mixed with hp ultra. I've seen many teardowns on YouTube about lower crankcase bearing not being lubricated properly at 50:1. I understand this could be opening a huge can of worms here but would there be anything negative about running my 500i at 40:1 instead? Stihl will allways push 50:1 just looking for an honest opinion from you. Thanks. 

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With a fully synthetic oil, 50:1 should be all you need for a well running machine. You could use 45:1 as a bit of safety and depending on how you make up your mix and the accuracy of that method but if you use too much, you may end up with too much carbon build up so 50:1 should work as the manufacturer intended or 45:1 if you want that little more safety.

A little note, for Gods sake don't say that 45:1 weakens the mixture as we have discussed this at length and don't want to hear it all again. I would rather go down the fish based responses again......perhaps I should have said for "Cods" sake!!!!

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3 minutes ago, spudulike said:

With a fully synthetic oil, 50:1 should be all you need for a well running machine. You could use 45:1 as a bit of safety and depending on how you make up your mix and the accuracy of that method but if you use too much, you may end up with too much carbon build up so 50:1 should work as the manufacturer intended or 45:1 if you want that little more safety.

A little note, for Gods sake don't say that 45:1 weakens the mixture as we have discussed this at length and don't want to hear it all again. I would rather go down the fish based responses again......perhaps I should have said for "Cods" sake!!!!

What about a semi synthetic?

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1 hour ago, spudulike said:

Yup, 50:1 is all you need but I tend to give it 45:1 as that is what I do and rarely run much for any prolonged use now.

My choice but 50:1 is all you need and don't use it after storing it for weeks, the fuel destroys the oil over time.

How much oil for a 5 litre can for 45:1?

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