This one is a "90". Kinda partial to the older ones cuz the're cheap and have iron sleeves I can bore myself.
I'll risk catchin a little heat here with my opion on the vibration thing. Lots of peeps are of the opion that it's a terrible thing. I always mention it because it is an issue for some people. People have been riding millions of dirt bikes for many years having a ton of fun. They vibrate! If you want something to ride like your car buy a 4-stroke with soft shocks, electric start & reverse. What part of riding gives you the most pleasure? Sheer power? Plush ride? Soft landings? Great cornering? Everything's relative, everything's a compromise. Just depends on what ya like. IMHO
YZ Otis