On the track bikes with bias tyres, we used a file to scuff new tyres. After putting new bits in the engine all we could do was fire them up for a couple of minutes to be sure they ran, then take them to the track. No street riding to scuff or check things. One time I wheeled a bike off the truck, applied the front brake, and all the fluid puked out. We had just put in new O rings. I used a loaner for the day. UK.