Exhaust collector box baffles rattling

[Borderbob]

I can't live much longer with the rattle coming for the collector box on my R100GSPD classic. On the outside the box is in excellent condition but as I believe this is a common problem, the baffles have become detached inside. So the obvious solution is throw £200 at it and fit a new Y piece. Simple solution. It's then its not original but I guess only real purists would object.

Is there another option ie, cut open the box remove baffles and then have a stainless steel plate welded back over the hole? I've no idea if this is an option but I guess it could also be a cheaper solution. Or am I just being stupid?

 

[Nin]

Keihan used to do a very good replacement Bob, and it’ll run better than with a Y piece.


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[Kenny]

Disagree, I don't think it will run better with a Y piece !

Need a quality welder.

 

[tuftywhite]

I'm with you Nin, I think Kenny is too once he rereads your post.

 

[Nin]

I'm with you Nin, I think Kenny is too once he rereads your post.

Too many sillybubbles in my sentence

 

[Borderbob]

Keihan used to do a very good replacement Bob, and it’ll run better than with a Y piece.


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Thanks Nin. I checked but it seems they now (in the catalogue anyway) just do a Y piece. Must admit I'm tempted to keep it original if I can. May if necessary try to locate a specialist welder. Actually, I'm assuming its stainless not chrome. Better check.

 

[Borderbob]

I'm with you Nin, I think Kenny is too once he rereads your post.

That I can believe

 

[tuftywhite]

Seems like you're right Bob. I've just checked the Motobins site (they get theirs from Keihan too) and they've only got the Y piece and state that it replaces the collector box.

I'll have to look after mine then.

 

[Borderbob]

Thinking about it, I'm assuming that the collective thinking, is that the engine runs better with the OM box complete with baffles which offer a resistance. So in terms of smooth running, there is probably not much difference between a Y piece and a debaffled collector box. Unless you know different of course.

 

[Nin]

Maybe worth a chat with Keihan?


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[Kenny]

Too many sillybubbles in my sentence

We need a man hug...I speak scouse not sillybubbles!!

 

[ChasF]

I can't live much longer with the rattle coming for the collector box on my R100GSPD classic. On the outside the box is in excellent condition but as I believe this is a common problem, the baffles have become detached inside. So the obvious solution is throw £200 at it and fit a new Y piece. Simple solution. It's then its not original but I guess only real purists would object.

Is there another option ie, cut open the box remove baffles and then have a stainless steel plate welded back over the hole? I've no idea if this is an option but I guess it could also be a cheaper solution. Or am I just being stupid?

I cut the original open, removed the loose bits and welded it back together - it’s been like that for a good few years now, I will get around to replacing the whole system at some point. I’ve never noticed any difference in running.

 

[TAP02]

I think Motoren Israel do one that’s similar in looks to the original.

https://www.motoren-israel.com/Shop/Exhaust-Systems/R80G-S-and-R80ST/Stainless-Steel-collector-box-for-R80G-S-R80ST-Sport::571.html?language=en

 

[ChasF]

I think Motoren Israel do one that’s similar in looks to the original.

https://www.motoren-israel.com/Shop/Exhaust-Systems/R80G-S-and-R80ST/Stainless-Steel-collector-box-for-R80G-S-R80ST-Sport::571.html?language=en

Only for the 80s, it seems.

 

[TAP02]

I guess the alternative is very expensive.

https://www.bmwbayer.de/de/vorschalldaempfer-bmw-r80gs-r100gs-r100gs-pd-r80gs-basic

 

[Mistacat]

I have cut these open at the back and repaired or removed the loose baffle then rewelded a stainless plate.
If you need it doing probably easiest through mikeyboy & O&C of this parish.
The problem with a lot of stainless silencers is that the internals are mild steel and rot or if stainless internals (rare) they work harden and fracture through vibration.

 

[Tetley]

Just a side note, i removed the OEM collector from the HPN thinking it would save weight..Im not sure it made any difference to the running, but it was a lot louder with the Y piece. I'm now back to the OEM collector.

 

[Mad Hatter]

I’ve got a collector box off an R80GS Basic you can have for a small consideration. It’s rusty on the outside but solid inside

 

[Borderbob]

Really helpful to know Mistacat.

I'm certainly capable of performing the bafflechtomy myself but I'd probably seek out a professional welder to stitch it back up. Shouldn't be too hard to find. May go down that route. In the mean time, while that was being done, fit a secondhand Y piece as an experiment if I can find one. It appears that on an R100, if you tweak the carb settings, you can actually get increased power with a Y piece. I'm not looking for that really but it would be better than introducing a flat spot which is a possible consequence I hear. Can always sell the Y piece on again after buffing up.

 

[Borderbob]

Thanks for this Madhatter. I would but as the rest of the bike is in such good condition, I really want to fit something that is in equivalent condition. Interesting though as it appears this is a chromed component not stainless steel.