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General Category >> Rubber Side Down! >> Dyna Muffler installed: loud with throttle closed?
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Message started by Fishbulb on 09/08/14 at 12:06:15

Title: Dyna Muffler installed: loud with throttle closed?
Post by Fishbulb on 09/08/14 at 12:06:15

Savages,

Installed my Dyna muffler this weekend (rail mount, looks to have a cat). Install was smooth, don't seem to have any leaks. Muffler sounds good, bike seems to run good.

Carb is original jetting (i think!), 2 washers for the white spacer and I think 1.5-2 turns out. We are about 4-500 ft above sea level.

However, when riding and I close the throttle, I get a lot more noise. No hard backfires or anything, just a lot of burbling, etc. at a much higher volume.

Is this normal? Anything I should check? I plan to rejet when I put in the K&N... only time for one project at a time!

Thanks!

Title: Re: Dyna Muffler installed: loud with throttle clo
Post by Serowbot on 09/08/14 at 12:10:16

Normal..
What,.. you don't like it?... ;D...

Title: Re: Dyna Muffler installed: loud with throttle clo
Post by bobert_FSO on 09/08/14 at 12:28:34

The dyna mufflers are nothing compared to the Emgo shorty megaphone muffler or any mostly open muffler or pipe.

With the Emgo, closing the throttle to decelerate sounded like a diesel truck with a jake brake kicked in. Just a loud "blat blat blat" until the engine speed neared idle, then a lot of gurgling and burping. No loud gunshot afterfires.

It sounded better backing off then when accelerating.

Big singles sound like that. My high-school Ducati 250 did the same thing. They also get a real hollow-sounding exhaust note when the engine is running at a nice cruising speed and the throttle is held open just enough to maintain the current speed (overrun condition)

It's just the nature of the beast. Embrace it.

Title: Re: Dyna Muffler installed: loud with throttle clo
Post by Fishbulb on 09/08/14 at 13:26:21

Oh, i have no problems with it...as long as I am not F-ing anything up! :)

It does, however, confirm that I would not be a straight pipe guy...

Thanks!

Title: Re: Dyna Muffler installed: loud with throttle clo
Post by verslagen1 on 09/08/14 at 14:03:14

725D475C56415856340 wrote:

However, when riding and I close the throttle, I get a lot more noise. No hard backfires or anything, just a lot of burbling, etc. at a much higher volume.

Normal, sort of like a Jacobs brake on a diesel.

consider it a polite way of saying "get the hell outta may way"

Title: Re: Dyna Muffler installed: loud with throttle clo
Post by Ed L. on 09/08/14 at 15:40:34

Had a Dyna muffler, put it on my bike and rode it for a day then took it off. Screwed up the carb tuning and was way too loud, top speed was 85mph. Went back to a sporty with a 1/2 hole drilled through the baffle and the bike runs like stink up to 94mph. Raps and burbles on slowdown from speed, sounds like it is singing.
With the stage 1 cam I'm hoping for the ton. Some back pressure is a good thing for the engine breathing.
Different bikes like different tuning. Find what works for yours.

Title: Re: Dyna Muffler installed: loud with throttle clo
Post by Fishbulb on 09/08/14 at 18:04:29

Pardon my ignorance, but what is the difference? I thought they were all pretty much the same except the mounting options...???

Thank you!

44655E4D2F010 wrote:

Title: Re: Dyna Muffler installed: loud with throttle clo
Post by Serowbot on 09/08/14 at 18:07:40

436C766D67706967050 wrote:

Pardon my ignorance, but what is the difference? I thought they were all pretty much the same except the mounting options...???

Thank you!

Probably had no baffle at all... not stock...

Title: Re: Dyna Muffler installed: loud with throttle clo
Post by Ed L. on 09/08/14 at 19:26:46

Never checked the Dyna for baffles, it was a $5.00 flea market buy during bike week. I would think Serowbot is right about the baffles, don't know cause the Dyna went into the trash a long time ago.

Title: Re: Dyna Muffler installed: loud with throttle clo
Post by verslagen1 on 09/08/14 at 21:36:05

Look at the ass end with a butt light in hand.
if you see black hole all the way thru, then you don't have a baffle.
If you see a plate about half way thru the muff, then you have a baffle.
if you have a long enough probe, stick it in, if it stops, then you have found something. :-?

Title: Re: Dyna Muffler installed: loud with throttle clo
Post by justin_o_guy2 on 09/08/14 at 21:54:02

62716667787573717A25140 wrote:

Look at the ass end,
if you have a long enough probe, stick it in, if it stops, then you have found something. :-?

Quoted for its understated brilliance

Title: Re: Dyna Muffler installed: loud with throttle clo
Post by Serowbot on 09/08/14 at 22:19:18

5D4E5958474A4C4E451A2B0 wrote:

What's a "butt light"?... oooooooo....never mind,...I don't want to know... :-?...

Verse... there is no, single, phrase,... in that post...
Cheeze Whiz,.... this is such an unfortunate question... :-/...

Title: Re: Dyna Muffler installed: loud with throttle clo
Post by Ed L. on 09/09/14 at 06:42:31

LOL, you have a sick mnd :D