12GS ADV 4th Gear Harmonic Hum

[sfarson]

On a 6000km ride. Day 4 out of 10. Bike is fairly new... 5000km on the odometer so far. Have noticed while passing through towns, in 4th gear, at about 3500 RPMs and at 60-65 kmh there is a slight tranny throb/harmonic hummmm. Just hear it, can't feel it. Once I accelerate out of the RPM range is disappears. Only in 4th gear, only when cruising at the RPMs/KMH noted above. Guess just looking for peace of mind while on this tour. Bike is running great otherwise. Anyone else experience this or have a thought?

 

[Jon P]

I think what you are describing is what I have noticed too kind of a hum noise like.......mmmmmmmmm...........mmmmmmmmmm.........mmmmmmmm.......?

I really notice it at slower speeds as you describe and it does not go away when I pull the clutch in so it is not the tyres but I think the gearbox. On mine if I listen real carefull I can hear it in 5th and 6th gear as well although the frequency changes as I change gear.........5th is more mmmm....mmmm....mmmm....mmmm and 6th is mm..mm..mm..mm..mm..

I took it to the dealer and he says all is OK........so now I just sing a long to it!

 

[cookie]

mine certainly does it + there's another thread about this somewhere if you want more confirmation.

 

[Robbo1200ADV]

Mine does it too,as did my 1150 Se ,Harmonics is the correct term I believe ,so don't worry and have a good trip

 

[Yoda]

Mine does it in 5th (or is it 4th?) at about 45mph.

I think it's something to do with the harmonics of the tyres (Tourances) at that speed, matching some other frequency in the engine.

 

[Loiq]

mine is more a brrrrmmm brrmm brrmmmmm wonder if I should take it in to get it tuned up.




Coat, door, thanks

 

[sfarson]

Everyone... Thanks much for the perspective and p-o-v. You captured the sound and characteristics well! Guess it is one of the Munich charms. For sure, the bike has charmed the entire trip and has overdelivered.

 

[Deleted account 211025001]

The cure.........

.............can't say I've ever noticed it

Andres

 

[Jon P]

The resonance has now gone away! I wondered if it would go away on it's own. Just done a 3,600 mile trip (6,000 total now) and it just seemed to fade away. I reckon it was simply the shimming of the gear box and now it has 'run in' - that's my theory anyway and I am sticking to it!