Running Stihl Premium at 50:1 in all my saws, trimmers and leaf blowers for years with no issues.
I run 40:1 Amsoil Dominator in my dirt bike and 100:1 Amsoil Saber in my R/C airplanes but switching to Redline due to carbon fouling.
Absolutely no ethanol fuel in my small engines.
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I use this harness on my FS250 and love it.
It can be adjusted for your size.
How are you liking the FS250? Pretty badass machines!
Stihl 4119-710-9001 OEM Standard Harness for Trimmers & Brushcutters https://www.amazon.com/dp/B01ENDPC98/ref=cm_sw_r_cp_api_z1HjAb67479VY
