2004 fz6 new to me. 46000 km and just checked mine. All in spec but approaching the limit. Planning to inspect annually until they need doing. Was quoted $400 to have them done.
$1000 seems steep. i was thinking $600 is top for this job. but not just the valves. it has to include other things. just for the valve check alone? i cannot say....
just know this bike gets basic service, adjustments, and tires and keeps running and running
i like my shop in SoCal, ela area. guy is a rider and racer and gives good service at fair prices. adding on a coffee shop, too