You raise an interesting point on the fuel ratio.
The manufacturer�s recommendation is 50:1. This recommendation is also clearly labelled on the new fuel cap I received which has 50:1 clearly labelled on it.
I have however been running the engine on 25:1 as the majority of other machines recommend this ratio. I figured it couldn�t hurt the engine with the exception of fouling a plug and being a little smokey on start-up. I plan on continuing to run the engine of 25:1 unless you think otherwise?
I didn�t get a chance to seriously test the engine on the weekend in long grass however I mowed my lawn without any issues.
I get back to you about the machines performance in the long grass.