Author Topic: Exhaust, muffler, silencer question  (Read 661 times)

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Offline dankeller

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Exhaust, muffler, silencer question
« on: May 30, 2017, 02:39:05 AM »
Does anyone know the difference, if any, between the mufflers for the xs500e, which are given part nos. 371-14711-06-00 and 371-14721-06-00, as best I can tell, and the mufflers for other years (1975-1977), which have the same part nos., but end with an -04 or -05 instead of -06?

Also how can you tell them apart visually? They all appear to be stamped with only the first two portions of the part number (i.e. "371-14711"), without the suffix -04, -05, or -06.

And what is the downside of using an -04 or -05 suffix muffler on the 1978 xs500e?

Thanks.

Offline dankeller

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Re: Exhaust, muffler, silencer question
« Reply #1 on: June 09, 2017, 02:13:08 AM »
Does anyone know about these exhausts? Anyone have access to the Yamaha technical bulletins? Anyone know where else I can look for an answer. Thanks.

Dan

Offline jimmer

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Re: Exhaust, muffler, silencer question
« Reply #2 on: June 09, 2017, 05:22:50 AM »
Dan, I can't imagine any thing drastic or critical. The most important thing would be condition. Rust, internal and external.I would think 🤞'76 to '78 should intermingle.

Offline dankeller

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Re: Exhaust, muffler, silencer question
« Reply #3 on: June 10, 2017, 12:33:41 AM »
Thanks Jim. Appreciate it.
Dan

Offline guylr

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Re: Exhaust, muffler, silencer question
« Reply #4 on: June 10, 2017, 06:46:23 PM »
Any muffler starting with the 371 prefix should work for any year 73 to 78.

Guy
Now Retired Yamaha guy. Cut me and I bleed "Cinquasia Red"

Offline dankeller

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Re: Exhaust, muffler, silencer question
« Reply #5 on: June 12, 2017, 03:02:55 AM »
Thanks Guy.

Offline Jewbacca

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Re: Exhaust, muffler, silencer question
« Reply #6 on: July 19, 2017, 05:15:54 AM »
Better option is to get rid of the stock exhaust which weighs 300 lbs and replace it with some thin wall stainless tubing and some lightweight universal mufflers and then rejet the carbs. A couple hp gain and drop a ton of weight at the same time.
1974 TX500A
I'm unique, just like everyone else.

Offline dankeller

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Re: Exhaust, muffler, silencer question
« Reply #7 on: July 23, 2017, 02:55:07 AM »
It's the rejetting I worry about.

Offline Jewbacca

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Re: Exhaust, muffler, silencer question
« Reply #8 on: August 10, 2017, 05:23:08 AM »
Rejetting isn't as hard as one would think. It IS time consuming, but not impossible. Familiarize yourself with "plug chop" and grab a selection for all the jets.

Of course, the easier route would be to replace the Keihins with Mikuni flat slides and you can swap jets on the side of the highway while dialing it in.
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I'm unique, just like everyone else.

Offline dailydose1

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Re: Exhaust, muffler, silencer question
« Reply #9 on: August 21, 2017, 04:57:13 AM »
search the forum and google, someone did a lot of work with jetting these. i think its 135 main jet, rest stock with 2 shims on needle

Offline dankeller

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Re: Exhaust, muffler, silencer question
« Reply #10 on: October 11, 2017, 01:11:02 AM »
As far as I can tell, the difference between the 78 mufflers and the earlier mufflers is that the 78s are open from inlet to outlet, while the earlier mufflers have a baffle in between. When I look in one end of the 78s I can see through to the other end.  With the earlier muffler the view to the other end is blocked.  I donít notice any difference in how my 78 works with the earlier mufflers.  The sound is slightly different, more muffled, but not much to my ears.

Dan