1 K75 Muffler Life Expectancy Wed May 25, 2022 6:08 pm
Point-Seven-five
Life time member
For the past couple years my K75RT(which has 100,000 miles) has been annoying me with the volume of the exhaust. Even with good earplugs I am finding it to be too damn loud, especially around town at low speeds where there is no wind noise to drown it out, and even the wind noise doesn't totally cover the exhaust note at highway speeds anymore.
I have tightened up the exhaust connections and replaced the copper gaskets to no avail, and even went so far as to replace the original muffler with a lower mileage(~61,000 miles) unit. But, alas, there is still a lot of exhaust noise coming out the hole in end of the muffler.
My question, is there a life expectancy for a brick muffler after which it's ability to tame the exhaust noise decreases allowing the sound level to increase? Has anyone ever dissected one to see if the internal baffles are burnt away over time? Is it worth $700+ to install a new one? I can't believe it was this noisy when it was new. Has anyone installed a new muffler and achieved a reduction in sound level?
Also, looking at the parts lists at MaxBMW I see that there is a muffler for the K75 that has a catalytic converter noted in it's description. How do I know if that is the one I might need?
I have tightened up the exhaust connections and replaced the copper gaskets to no avail, and even went so far as to replace the original muffler with a lower mileage(~61,000 miles) unit. But, alas, there is still a lot of exhaust noise coming out the hole in end of the muffler.
My question, is there a life expectancy for a brick muffler after which it's ability to tame the exhaust noise decreases allowing the sound level to increase? Has anyone ever dissected one to see if the internal baffles are burnt away over time? Is it worth $700+ to install a new one? I can't believe it was this noisy when it was new. Has anyone installed a new muffler and achieved a reduction in sound level?
Also, looking at the parts lists at MaxBMW I see that there is a muffler for the K75 that has a catalytic converter noted in it's description. How do I know if that is the one I might need?
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Present: 1991 K100RS "Moby Brick Too"
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175