valved checked, All good
Posted September 30, 2010 - 03:48 PM
Posted October 02, 2010 - 02:02 PM
Yamaha recommends checking them every 500km but I have been told by numerous owners/tuners/mechanics that this is un-necessary unless you are a serious, hard-riding racer.
I checked mine ('08 WR450F) at about 1000km, then 2000km and they had hardly changed at all and remained within specs anyway.
I'm going to look at mine at 4000km next.
I'm not a racer anymore, just a fast trail-rider these days.
Posted October 04, 2010 - 01:22 AM
Posted October 05, 2010 - 12:12 PM
Valves tend to get tighter, not looser, as an engine wears.
Posted October 05, 2010 - 12:36 PM
Posted October 05, 2010 - 04:05 PM