Intermittent Tick and skip a beat

[zirconxi_imp]

Hi all, recently my bike have developed this intermittent ticks sound and engine will skip a beat when it happen during idling. It only happen after engine warm up and will skip a beat during idling/ free gear revving. But never happen during riding/ accelerating.
I had recorded a clips when this happen during free gear revving and happen at 5s Mark.
Can't get any video during idling because its intermittent.

Something loose maybe???

 

[Lord Popgun]

I’m not sure I’m hearing anything other than the fuel injectors.

 

[GoldOxide_imp]

Yeah, I heard some sort of "pict" sound, but hard for me to discern.

 

[zirconxi_imp]

I’m not sure I’m hearing anything other than the fuel injectors.

Well, at exact 5s point there's a "tink" sound. I guess the engine noise might have cover it. During idling the engine kind of skip a beat but engine never dies.

 

[GoldOxide_imp]

Some freak predetonation maybe? Maybe a tad carbon build-up on a valve seat that glows longer than desired? Dunno.