hello thank you for this oppertunity. to ask a couple questions.i just bought a 2004 yz 250 my first new bike. the sales man was no help so maybe you can help. i read the braekin procedures. in the service manual is pretty intense i can do it but god cleaning the top of the piston off seems extreme to me. is this a must or what? and can i just use a good quality 2 stroke oil. or should i stick with yamaha oils/lubes. thankyou for your time. jay