Can you use 50 to 1 in 40 to 1?

There is very little difference in 50:1 and 40:1 fuel mix. 50:1 and 40:1 fuel mix will operate in all fast R.P.M 2-cycle engines. These are speeds of 5,000 RPMs and faster. Most string trimmers and blowers run at 8,000 to 10,000 RPMs.

Updated: 18th November 2019

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