My wife's bike just hit the 19,000kms and me thinking that valves were checked every 24,000kms thought I was in the clear. To my surprise, the manual calls for a valve check every 12,000kms. For those that have gone over the 12,000kms, how far off were the valve clearances? Can I wait until 24,000kms or it is a ticking time bomb? This bike has been babied, I don't believe it has gone over 11000rpm.