My ZZR has started producing this uneven clicking sound when it warms up - once I put it into gear and ride away it doesn't make the sound anymore. I'm not entirely sure where it's coming from, but it appears to be low down on the bike, maybe next to the pegs (that said, it could really be anywhere - my directional hearing isn't that finely tuned). It's pretty much happened suddenly - I haven't done anything lately except clean the front sprocket (I figure it's not that because the chain doesn't turn when it warms up) and slightly tweaking the idle mixture - but it didn't start happening straight after that, it took a few days. Is it likely to be the valve clearances? And if I keep riding my bike will it eventually explode and blow my nads off? Thanks .