My boat not having an oil reservoir, when I installed my 94 Evinrude two-stroke I removed the fuel/oil VRO pump and replaced it with a fuel only pump, capping off the oil inlet to the engine but leaving all of those hoses in place. I premix 50:1. It smokes a lot and I hear the phrase Better Smoke than Broke a lot.
I wonder, since I very rarely run wide open... do I really need 50:1? Isn't that pretty much WOT ratio? Shouldn't I be able to mix 40:1 and be fine and result in less carbon build-up? Doesn't the VRO pump somewhere around 150:1 at idle and 50:1 wide open? What would be the worst case scenario if you were mixed at 40:1 and ran WOT for, say, 5 minutes?
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