standard silencer question

[fenj66]

hi all, i was wondering what the circular metal gizmo was just above where the inlet pipe connects to the standard silencer.
some models dont seem to have one fitted???

 

[Deleted account 190920001]

Exhaust/flappy valve. It's only on the twin cam bikes and newer. They seem to be a pain in the rear and fail a lot.

 

[autogs]

Exhaust/flappy valve. It's only on the twin cam bikes and newer. They seem to be a pain in the rear and fail a lot.

flappy valve correct,but ive had 5 twin cams and never had one fail,all ridden through the winter and never a problem

 

[Deleted account 190920001]

flappy valve correct,but ive had 5 twin cams and never had one fail,all ridden through the winter and never a problem

Yes fair enough but they still fail a lot.

 

[fenj66]

I should have said. Mine is a a 2004 model. Now I'm worried!!

 

[comberjohn]

Maybe someone has fitted a complete TC system. Interchangeable if you fit the whole system.
If you're still worried post a picture and we'll have a look. You've got us intrigued now.

 

[fenj66]

sorry, should have posted a pic earlier.

the round thingy has nothing connected to it??

 

[Deleted account 190920001]

That's not the exhaust valve that I am on about. No idea what that is, my 09 didn't have it.

 

[fenj66]

heres another pic....

 

[Slipperyeel]

flappy valve correct,but ive had 5 twin cams and never had one fail,all ridden through the winter and never a problem

Blimey. They only came out in 2010. How'd you get through that many in such a short time?

 

[comberjohn]

Seen them before. No idea what it does but wouldn't worry about it. Just part of the silencer.

 

[fenj66]

its got a small plastic piece in the centre with holes in it. a pressure release valve maybe??

 

[Bendy toy]

My 08 GSA silencer has not got one so who knows what it does.

 

[Popell]

My 2005 doesn't have one - I feel cheated!


No idea what it's for though

 

[fenj66]

its shown in the bmw parts catalogue:

 

[Jon P]

I don't know what it is but the first 1200GSs all had it from 2004 - 2006. 2007 models onwards don't have it.

 

[DrFarkoff]

Early version of Flappy valve If I recall from my training

Was something like an Exup valve allegedly to provide More back pressure and allegedly torque at Low RPM

Which is about the only change from having the Full Remus fitted Slightly More revs are required to pull away (seems to have lost a Little of the "Grunt" but once moving the Remus is Superior in all ways