Rubber bung on final drive ?

[The old git]

Hi all. Iv been gone for 3 years, I'm back under another name as the computer can't remember me.
Over the years I have had a few GSs 02 1150, 04 1200, 07gsa and 08 gsa

I did make the mistake of going to a honda st1300 but I have finally succumbed to my itch to get another GSA. ( the deals available helped ) plus this was the last chance to get a new Proper GS. With a dry clutch and a proper indicator switch.

After 4 weeks and 2500 miles I thought I should give it a clean.
And I noticed a new bit.

What is this Rubber Bung on the Final Drive, never seen one of those before.
Gave it a little wiggle and it comes out leaving a hole into the FD.
Don't like the look of that, water going into FD does not sound like a good idea,
Bung seems to come out fairly easily , could it come out whilst riding?.
I did try a search but nothing useful. I'm sure one of you will know what it is and why.
Good to be back

 

[Wapping]

Gave it a little wiggle and it comes out leaving a hole into the FD.

Aaaaghh, you have relased the Canbus gasses bung valve

 

[Robbo1200ADV]

It's Fucked Scrap it

 

[ghost-rider]

its a breather for the final drive

 

[Pukmeister]

It's designed to let water into the final drive due to a sudden internal pressure drop through cooling, eg fording rivers. An anti-fording device.

 

[solidstate100]

Built in water ingress failure device. Word is that the final drives are becoming more reliable of late and BMW are starting to lose money on replacement parts......

 

[The old git]

It's designed to let water into the final drive due to a sudden internal pressure drop through cooling, eg fording rivers. An anti-fording device.

Ok I will avoid puddles, presumably I can take it out in the rain!

 

[The old git]

Built in water ingress failure device. Word is that the final drives are becoming more reliable of late and BMW are starting to lose money on replacement parts......

I will start saving

 

[The old git]

its a breather for the final drive

Thanks, I can understand that,but do not understand why. No previous bikes had breathers in the final drive unless it was a different design and I never noticed it.

I believe some of my older bikes had sealed for life final drives and some needed the oil changed

 

[BD]

Built in water ingress failure device. Word is that the final drives are becoming more reliable of late and BMW are starting to lose money on replacement parts......

don't forget it can also be activated by unwariy ukgser having a jolly holiday in the alps, thrashing up and down without taking heed of the altidude pressure change, that's why you always get to the top and find all the placed already snatched by "de germans", they`re not realy sunbathing just letting the FD acclimatize!

 

[(RIP) Miff]

I believe some of my older bikes had sealed for life final drives and some needed the oil changed

The early 1200GS final drive was sealed for life AND you have to change the oil

 

[Bendy toy]

My last bike was shaft drive and had a breather on the casing. Specially designed to release excess oil if the thing was ever overfilled.

 

[Beemerman59]

My 1994 K1100RS has a breather on the FD and I still need to change the oil