Planet Minis

yadihonda · 08-26-2009, 09:03 PM

I now have a 1975 z50k6 running as well as a 1969 z50k1. The k1 is much louder than the k6. Is that normal or is the exhaust/muffler defective? I've checked it for leaks, but man its loud compared to the k6.

mexicanyella · 08-27-2009, 07:41 AM

It's normal. Hardtail exhausts are not very effective at muffling the midrange and higher frequencies. Z50R and softtail Z50A-type pipes are much quieter.

Really about all that's inside a hardtail muffler is a spiraly vane spark arrestor baffle. A lot of the muffling that takes place, what little there is of it, comes from forcing the exhaust to exit through that skinny little stinger.

I have not seen a cutaway of a later-style pipe, but would guess that large chamber allows some expansion room in front of a pretty circuitous and restrictive baffle without choking the engine too much. They sure are quiet.

08-26-2009, 09:03 PM	#1 (permalink)
yadihonda 1st Gear Member Join Date: Jun 2009 Location: Eastern PA Posts: 102 My Mood:	dumb question about noise level.... I now have a 1975 z50k6 running as well as a 1969 z50k1. The k1 is much louder than the k6. Is that normal or is the exhaust/muffler defective? I've checked it for leaks, but man its loud compared to the k6.

08-27-2009, 07:41 AM	#2 (permalink)
mexicanyella El rey de los puntos Join Date: Aug 2008 Location: Troy, MO Posts: 984	Re: dumb question about noise level.... It's normal. Hardtail exhausts are not very effective at muffling the midrange and higher frequencies. Z50R and softtail Z50A-type pipes are much quieter. Really about all that's inside a hardtail muffler is a spiraly vane spark arrestor baffle. A lot of the muffling that takes place, what little there is of it, comes from forcing the exhaust to exit through that skinny little stinger. I have not seen a cutaway of a later-style pipe, but would guess that large chamber allows some expansion room in front of a pretty circuitous and restrictive baffle without choking the engine too much. They sure are quiet.

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