Top end noise

[AlexB]

Hi guys, my bike developed a sound that seems to come from the top end, which completely disappears after the bike is warm, this is a cold start, also it was low on oil and that's why I noticed to sound started, now it's topped up and up to level, the oil is Motul 5100 10-40. Any ideas about what it could be and if should I be worried?

 

[BAHNST]

How low was the oil?
And did the noise disappear after top up or still there?

 

[AlexB]

It was barely touching the rod, after topping up the noise comes and goes away in the first 3,4 minutes of a ride, after that it goes away completely until the next start of the bike, it doesn't matter whether it's cold or warm engine, same symptoms every time, I was thinking one of the tappets takes a while to work in parameters??

 

[BAHNST]

Im not a hydraulic tappet expert..there does seem to be tappet noise there.
Others may chime in.
If the oil was at the lowest level and checked as per the factory manual/owners manual you may be ok..

 

[AlexB]

Hopefully, I was thinking to open the top end and bleed the tappets, it only requires a top gasket and one afternoon

 

[BAHNST]

Thats all it might need. if you are confident to do it..not much help sorry...