Factory Honda Team outdoor ported cyl head lo hrs 4 ,great shape no damage except for chipped exhaust valve seet obtained an payed friend sometime after being used 05 rd#6 thunder valley national still seals perfectly installed for Mammoth MX 2 timesl an raced 2012 Jr Division 1 you tube lol Start vs YZ250 117pd mini rider ,installed 7.5pd instead of 4.5pd flywheel weight request to slow it after morn practice,used kibblewhite dual spring kit incl (no 2 cam sold) ,. planned to berielium upgrade install single spring ti valve kit,ti coated buckets . 08 450 stolen by 5 bad Hombres Gobs of smooth fast power super long pull in the hands of pro,Int jetted a needle clip change and a tiny jet #45 replaced with #47 maybe was #46 ? Leak jet I think sounds right .it's a no brainier guys. buyer pays exact shipping per post office receipt