I have an older but brand new os 91.it seems that would be a good match.its not the powerhouse a new surpasss 91 has but its still a 90 fourstoke and I gotta believe it would fly that 46 well.I thought about the 60 size but frankly if I were to do that I would get at least a 100 or 120..so os surpass 91 in a 46 ..say its a go guys..