Ace 90 is just that a 90cc this particular one only has 17 original miles on it. I purchased the Ace and Super Rat (100cc) from a person whom had them stored in the basement for 25 years. Lot of dirt and grime, it took me around three days each to get em cleaned up. Had to re-chrome the 90 tank but the Rat was pretty good until I started it and the crank seal had dried up and oil weeped out the vent. Two hun later for the tank chroming and three hun to replace the crank seal on the rat they are both runable, though I don't plan on starting them again anytime soon. I like just looking at in the basement.
When I was a kid I couldn't afford the Rat but I remember a couple of guys from school riding up the street wheeling. They were pretty cool bikes in there day. There's an article on the net called "Ode to Hodaka" which tells the story on the manafacturer. Sort of interesting, at one time they where owned by Shell Oil company.