always, always take ur time when doing a rebuild man, it is expensive if you f*ck sh*t up and have to buy a new piston kit because you didn't break it in right or you didn't put something together right, and always use good yamaha oil, my bike has been running yama 2r, i am still on stock bore,rings, piston, its an 02,its all about how you take care of it, you can ride the piss out of it, i do, but mine is well maintained and well looked after, and preventative maintenance saves you money. and everyone knows in times like now every dollar counts