no way they couldnt have been wound back, and besides you look at all the imports on say prestigemotorsports, the majority of them say km tue km unknown due to 320 km/hr speedo fitted, they just change em i reckon bcoz over there they have to get rid of them after 60 thou or sumthing, so i reckon to get around it they just change there speedos when they reach that amount of kms so they can keep em registered in japland. is it a good theory??