V Fours are Very Cool in fact I saw a Unicorn today - an original 1986 Honda Interceptor. Looked and sounded great, went away pretty darn zippy ! I had to have one back when they were released it was leading edge at the time, but after seeing a streetbike up under a pickup I put my deposit over on a new liquid cooled CR250. Never got my V4.
H-D could have built one, project Nova or something later on. I think the Honda was 551 Lbs as a 750, with 86 Hp at the crank, and that's with Japanese engineering. Imagine what the H-D 1500-2000cc V 4 would weigh ? A double Revo would add 100 Lbs to the bike, minimum, so 750 -800 Lbs - Big, Heavy, even then it would never be as good as a V Max. No place to put any more gas, like a V Max. And you can get huge power out of a V Twin if done right, the bikes slimmer, easier to produce, less weight etc. Although very interesting, the complexity, cost, weight, low fuel range etc. of a V4 just didn't fit in H-D's line-up. Maybe they'll resurrect it in their " New Hundred Bikes " tease but how would it ever hold a candle to newer V4 bikes ? Most are race bikes not cruisers as well. Just don't see it. It's an answer to a question few have even asked. Keep your left nut CaveMan450 - you'll be happier to have it !