The previous post about octane is pretty common knowledge, for people running two-strokes. But my question is, and the common belief among my friends is the higher the octane ( even mid-grade 89 or 90) is safer for the risk of contamination. Meaning water in fuel. I just went through this yesterday, I had filled up the ski with 87 octane(bone stock), and after half a tank, started getting surges, rough idle, high idle, hard starts. I added iso-heet and topped the tank off with mid-grade 90. Yesterday I went through that tank, and two more. No more problems since then.
I have had this happen in sleds, ski's, and even the 4-stoke atv once. I can always add heet (isoprypol), and it takes care of it. The fuel is coming from various stations. I also thought that was why Yamaha came out with the D.C.S. system on the new sleds. poor quality gas.
I have had this happen in sleds, ski's, and even the 4-stoke atv once. I can always add heet (isoprypol), and it takes care of it. The fuel is coming from various stations. I also thought that was why Yamaha came out with the D.C.S. system on the new sleds. poor quality gas.
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