I have a 2006 kx250f bought it new in 06. So its 2011 now and I have not put in new piston or rings since ive bought it. I was thinking of replacing it but not sure if i need to it still runs good seems it loss some compression when i kick it but still starts easy. any advice would be great. i raced it in (07 6x) (08 17x) (09 6x) (10 2x)