BMW K bikes (Bricks)

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1Back to top Go down   Muffler heat shield holes K100rs Empty Muffler heat shield holes K100rs Tue May 19, 2015 1:32 pm

Flip2

Flip2
Silver member
Silver member
I had new heat shield brackets welded on last year so I could reattach the heat shield and now need to remove one of them temporarily  so the hole underneath the bracket can be welded shut to stop an exhaust leak. There is the hole that goes thru the muffler that I was going to have closed, but there is also a second smaller hole beneath the  first one, should I try to leave the smaller hole open or does it not really matter?  What were these holes for?

    

2Back to top Go down   Muffler heat shield holes K100rs Empty Re: Muffler heat shield holes K100rs Tue May 19, 2015 2:40 pm

Born Again Eccentric

Born Again Eccentric
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Life time member
Flip - far as I know, there shouldn't be any holes through the muffler walls as these will give exhaust leaks and increased noise as the exhaust gas will take the easiest path to atmosphere (avoiding the baffles). It is surprising how much pressure does build up in the muffler. I had a hole appear in my original stainless exhaust on my previous K - tried to patch it with off the shelf exhaust repair paste, tape and every other exhaust repair product from my local auto store - waste of money, it just kept blowing after a few runs and, in the end, I got myself a complete second hand exhaust and fitted that (complete with the saga of having to drill out 6 of the 8 exhaust header studs that sheared off during removal!).

It may be that by welding on new brackets last year that you have either burned through the muffler or created a heat affected zone that has caused accelerated corrosion which has resulted in pin hole leaks (which get bigger over time). Yes stainless steel does corrode (just not as quickly as mild steel) and can be badly affected by salt (causes crevice corrosion and/or cracking)


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Muffler heat shield holes K100rs Uk-log10 Muffler heat shield holes K100rs Sco-lo15
                              Paul  Muffler heat shield holes K100rs 905546712

"Heidi" K100LT 1991 (Grey) (VIN 0190172 Engine No. 104EB 2590 2213) - 5th owner. January 2014 (34,000 - 61,000 miles and counting....)
"Gretel" K100LT 1989 (Silver Grey) (VIN 0177324 Engine No. 104EA 2789 2211) - 4th+ owner. September 2015 (58,500miles and counting....). Cat C Insurance write-off rebuild Feb 17
"Donor" K100LT 1990 (Red)  (VIN 0178091 Engine No. 4489 2024) - 6th & final owner (crash write-off now donor bike).   June 2012 (73,000 miles) to November 2013 (89,500 miles)
    

3Back to top Go down   Muffler heat shield holes K100rs Empty Re: Muffler heat shield holes K100rs Wed May 20, 2015 9:18 am

Flip2

Flip2
Silver member
Silver member
Ok, I will have the hole welded shut,thanks.     I don't know if the muffler was switched from another bike possibly but these holes look like they came from the factory as they are nice and clean and uniform . I don't have a photo right now but I was wondering if the small hole was threaded.

    

4Back to top Go down   Muffler heat shield holes K100rs Empty Re: Muffler heat shield holes K100rs Wed May 20, 2015 9:39 am

Avenger GT

Avenger GT
Life time member
Life time member

    

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