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Message: <blockquote data-quote="thill" data-source="post: 510076" data-attributes="member: 4972">Most 90's Johnsons require 50:1 TCW3 oil if premixing.   If you are idling around, it will probably be okay, but I wouldn't run it hard with 100:1, synthetic or not.  A lot of bass guys, who run long distances at WOT run the big 2-strokes at 40:1 or even 32:1.Doug, Your description sounds like it's running a little rich at idle, and just needs a minor idle adjustment as Mr. Giggles wrote.  Adjust it a little at a time, probably 1/8 turn is all it will need.Even so, better a little smoke than burnt cylinders or damaged bearings!   You may have heard the saying to never let perfection ruin a good job?   Lean it out too much and you could torch your engine.  Just be careful.</blockquote>