I can't speak for your exact model, but I have a 91' 75hp evinrude with the VRO pump removed, ran at my mix of 50:1and have trolled for hours with no issues. She fires right up and doesn't spit after a good 4-5 hr troll. Only thing that bugged me was that at troll speed she shook the boat a bit, again completely different setup than yours just figured I'd share my experience. Thankfully I scored a sweet little honda 4 stroke and will be running that this year.