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I believe the Arctic is a 50:1 ratio. I have the Suzuki counterpart that I run 40:1 on though. I always run on the side of caution with a little extra oil.
Oils are better today. That means you can run proper ratios without fouling plugs and having carbon build up!
The HD and TD NEED the 16:1 ratio to run properly. They run like crap on a leaner mix. The 16:1 mix helps lubricate, but also SEAL.
If a motor is smoking and dumping excess oils into the water they are not properly in tune or the oil is junk. I am a proud supporter of the XD series of oils by BRP. I run the XD 30 in all of my vintage motors at PROPER ratio. None of my motors excessively smoke or dump excess oil into the water.