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Post by motomartin on Jan 3, 2018 1:50:32 GMT -5
Although it doesn't say anything much about it in the service manual, judging by the three bolts in the end caps, I am assuming there are removable baffles in the silencers.
My bike is pretty loud, I have car drivers close their windows at stop lights when I'm around. So I doubt after 43 years if there is any sound deadening material left. Have any of you re-packed your baffles? Do you have any tips to pass along?
Cheers,
Martin
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Post by Jean-Denis on Jan 4, 2018 16:30:39 GMT -5
Hi,
I have done it on my bike. Once remove the 4 screws at the end of the muffler, you can pull out the small pipe and then replace the deadening material. It's a little bit better after but it's clear that the bike stay a noisy bike...
Cheers,
Jean-Denis
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Post by timpa136 on Jan 4, 2018 20:44:05 GMT -5
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Post by motomartin on Jan 4, 2018 23:08:59 GMT -5
Thanks for the reply's guys.
I know there is some kind video on the droning thread, but it does not show up for me to click on.
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Post by motomartin on Jan 6, 2018 14:08:22 GMT -5
The baffles are much shorter than I had imagined! I was thinking they would be more like the old two stroke baffles 18" long or so, these are only about 6" long. The stainless steel end plates are really thin and should not be pried off with a screwdriver for fear of bending them. I placed a piece of irrigation tube into the second one and worked it loose that way, after learning the hard way the first time.
As I thought, there was no sound deadening material in the pipes at all. Now after putting the new wadding in, the bike is somewhat quieter at idle - which is what I wanted.
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Post by wayne on Jan 6, 2018 15:54:14 GMT -5
To reduce noise, Suzuki fitted smaller diameter baffles or "spark arrestors" from frame number 11901 and put out a Bulletin in June 1975 (RE-020)
I've come across a number of bikes with the old style large diameter baffles.
Which do you have, the later 26 mm (noisy) or the early 32 mm (noisier). If you have the latter and don't like the noise, perhaps you could source some 26 mm.
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Post by jm0406 on Jan 6, 2018 16:15:08 GMT -5
Or what about the exhaust extensions that they used on the bikes with bags? I have heard people say it is much quieter with them.
Jess might have a set to sell.
Jeff
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Post by motomartin on Jan 6, 2018 16:25:00 GMT -5
I have frame number 14925, and 26 mm seems about right for the baffle size that I have.
My initial euphoria over the change in exhaust volume has been moderated a bit, but overall I think it is a small improvement.
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Post by wayne on Jan 6, 2018 18:01:15 GMT -5
Or what about the exhaust extensions that they used on the bikes with bags? I have heard people say it is much quieter with them. Jess might have a set to sell. Jeff I find there's not much difference fitting the exhaust extensions on their own. However, you can really go to town and pack them with insulation without affecting performance. This gives a measured sound reduction of about 4 db(A) at 4000 rpm on a static test. It doesn't make it whisper quiet but it is significant. This thread refers with pictures: re5rotary.proboards.com/thread/929/exhaust-extensions-more-bling |
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