Slight rummble at idle

kendo57

kendo57

My bike [an 07 sd] is running well with no apparent problems but i can hear a slight rummble noise at tickover.
On cold start the noise is not there, then as the revs settle i can hear it, if i rev the engine it goes and then reappears as the revs drop back to idle.
I thought it was maybe the clutch/gearbox but pulling in the clutch lever makes no differance.
Can someone tell me if their SD is the same , or what i may be hearing as its not that easy for me to get to my dealer at the moment and it may just be normal.
cjc

cjc

Mine usually does not do what you describe, but when my oil gets low it does sound different at idle.