Piston engine goes boing boing boing, but a rotary goes mmmmmmmm. I'd noticed the "original tire" comment too, when I originally say the ad. No way the original tires made it 6700 miles either.It is impressive and fortunate that the bike still runs fine as U.S. techs were never taught to service these engines. The owner's manual specified that the engine be crated and shipped to Japan, if it needs service!