Re: 100:1 Mix
Some engines like it, some don't. There was never anything conclusive as to why. Lots of theories but no hard facts.
The engine I had that didn't respond well to Opti-2 is now retired. It had close to 2k miles on it but the bike was so uncomfortable to ride that it now hangs from my garage ceiling. It was still running strong when I put it up there but it wanted standard 2 stroke oil. Since that engine I've been running Opti @100:1 in all my other engines. I break in @100:1 and never change. I also use it in my 2 stroke lawn and garden equipment. Snow blower, leaf blower, edger/trimmer and a little roto tiller. They all seem to thrive on the 100:1 Opti-2.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"