FWIW it does tend to burn a bit cleaner in a liquid cooled bike motor. The higher compression ratio and cooler piston temps is the reason why I believe.Yes only for cookie cutting. Ran ST for a few tanks in a work saw once just as a test, made a mess, as expected.
I did run a gallon and a half of leftover ST mixed at 32:1 in my Redmax 8000 backpack blower. I was using the blower to burn slash from a lot clearing job I was doing. Basically I would start a fire and run the back back blower wide open to help burn up the green, wet and dirty stumps and limbs while I fed the pile with fresh material. Worked pretty good. However, I was appalled when I inspected the piston crown through the plug hole afterwards. I ended up pully the muffler and found the entire piston skirt had very heavy varnish. It took several years of running on K2 and several treatments of mercury marine power tune to remove 90% of it.