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Makotosun

RT Exhaust Silencers (add on)

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RT Exhaust Silencers (add on) was created by RT1

Has anyone had experience with adding a silencer onto their RT1 / RT2 exhaust pipe?
All that I can find in my searching are silencers designed for use on modern day bikes.
The backstory is that my stock exhaust pipe was modified some years ago into a "Sleeper Pipe".  It wasn't done for performance purposes.  It was done because the baffles inside of the pipe had disintegrated to the point that they were flopping around loose so it was my best option for a decent repair.
BUT, the noise!  It's terrible.  If I were 16yrs old I'd be thinking its the coolest thing in town.  But the reality is that the decibel level and pitch is an assault on the hearing of anyone or anything in the vicinity.  The bike isn't ridden far out in the woods and fields away from others.
If anyone has knowledge of a a properly fitting silencer that can be added onto the end of the exhaust pipe I'd sure be interested in learning what you know.  A source, a brand, a model, someone who custom makes them, etc.
Better yet, if anyone has a stock and in good condition  RT1B / RT2 exhaust pipe they'd like to sell I'd be very interested in that as well.
Looking forward to guidance that'll get me farther along then I've managed on my own.
Thanks All
'68 DT1, '71 RT1, '71 JT1 (x2), '72 AT2 (x2), '74 DT250A, '75 XS650, '54 BSA C11G, '70 Honda CT70, '73 Hodaka Combat Wombat, '05 Moto-Guzzi Breva, '15 Triumph Tiger, +++

"We are mere custodians of mechanical things. Our job it to care for them, improve them and pass them on to others.” - Peter Egan
Last edit: 28 Feb 2023 06:46 by RT1.
28 Feb 2023 06:43 #1

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Replied by 1971DT250 on topic RT Exhaust Silencers (add on)

I sent you a PM. I have a nice RT1 and 3 nice RT3 exhausts for sale.

The RT1 and RT1B exhaust is different from the RT2 and RT3 exhaust. But one will fit the other.
The hours spent riding my Enduros is not deducted from my life span.
28 Feb 2023 12:10 #2

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Replied by RT325 on topic RT Exhaust Silencers (add on)

If its been cut open & bits removed at some stage you might also be getting additional resonating noise coming through the walls. Might have to wrap it tight with that wide exhaust insulating tape i see advertised for car headers etc. Think it looks quite neat on bikes i've seen it on too--mostly 4 stroke bikes--but!!. Sorry i'm getting sidetracked & of course you still need your end muffler.
28 Feb 2023 14:08 #3

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Replied by RT1 on topic RT Exhaust Silencers (add on)

Thank you fellas for your replies.
1971DT250 - I received your message and have replied.
Hoping this will be a quick resolution to my issue.

And then I'll have a "Sleeper Pipe" for sale ;)
'68 DT1, '71 RT1, '71 JT1 (x2), '72 AT2 (x2), '74 DT250A, '75 XS650, '54 BSA C11G, '70 Honda CT70, '73 Hodaka Combat Wombat, '05 Moto-Guzzi Breva, '15 Triumph Tiger, +++

"We are mere custodians of mechanical things. Our job it to care for them, improve them and pass them on to others.” - Peter Egan
01 Mar 2023 04:39 #4

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Replied by MarkT on topic RT Exhaust Silencers (add on)

A "sleeper" is a vehicle that looks and sounds like it will perform as "original" but actually performs better than original.

Just FYI, a "sleeper pipe" as used to be made by a couple of members here, is NOT one that has been gutted to remove baffles and make it louder. Removing baffles gives you less power not more. And of course a lot more noise as you found out.

Baffles in a true "sleeper pipe" remain intact... they precisely added an internal cone inside the original exhaust to reflect pressure waves. This boosted power by making the stock pipe act more like an aftermarket two stroke expansion chamber.

Gutting a stock pipe of baffles is pretty much the opposite of a "sleeper pipe". You end up with less performance and much more noise.
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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01 Mar 2023 05:42 #5

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Replied by RT1 on topic RT Exhaust Silencers (add on)

Hello Mark -
Please know that I have appreciation for your FYI.  However, I do know what it is that I have. In an effort to make a long story short, I described how my stock pipe had the baffles stripped out.  So, apparently they're still in there.  My goof.  Regardless, my issue was resolved by having my pipe converted by whatever voodoo was done internally.  I know there's a lot more done to build the pipe (cone, etc.) than what I had described - but I don't remember the specifics and I wouldn't do the workmanship descriptive justice by trying.  What I do know is that the conversion fixed my issue. However - after conversion the pipe never, ever sounded anything near stock.  It's high pitched crackle being more akin to an expansion chamber.
But as I said, I know full well what I have, whereas my pipe... my Sleeper Pipe.... was built by forum member (past or present) Dave Meis.  It is Sleeper Pipe SP67.
My "Sleeper Pipe" was "built" as my best option for my issue.... and as I wrote, it took care of my issue.  And created another   

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  LOL
It'll be for sale shortly.
'68 DT1, '71 RT1, '71 JT1 (x2), '72 AT2 (x2), '74 DT250A, '75 XS650, '54 BSA C11G, '70 Honda CT70, '73 Hodaka Combat Wombat, '05 Moto-Guzzi Breva, '15 Triumph Tiger, +++

"We are mere custodians of mechanical things. Our job it to care for them, improve them and pass them on to others.” - Peter Egan
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Last edit: 01 Mar 2023 12:03 by RT1.
01 Mar 2023 09:18 #6

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Replied by MarkT on topic RT Exhaust Silencers (add on)

Okay. I thought you had just gutted your pipe from what you said in your first post.

Surprised that yours is so loud. The sleeper pipe tends to have a little more "crispness" to the exhaust note but I've never noted them to be appreciably louder. And that's side by side... I've been to several riding events where participants have had stock and sleeper pipes on 175's, 250's, and 360's...

Even the original stock pipe (and intake!) on the early 70's bikes are just very loud in my opinion. Noise laws were pretty lax back then.
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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01 Mar 2023 18:21 #7

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Replied by RT1 on topic RT Exhaust Silencers (add on)

Absolutely agree with you.  The starting point of the decibel level on a stock pipe isn't good in it's own right.  But if I haven't already emphasized it enough, this pipe is simply offensive to the senses.  

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  Nothing changed with it.  It's been that way since the day I got it back.  If the bike were used out in the fields, woods, logging roads, etc. I wouldn't be as intent on replacing it.  Originally, (as the post title indicates) I was hoping to find that there were a simple silencer that would fit (even with some minor mods) over the tail section.  I would've been willing to live with an odd looking extended exhaust.

I don't want any misunderstandings by anyone reading this.... this Sleeper Pipe that I have is a good pipe!  And it will be for sale.  Just because I can't live with the noise level it produces doesn't mean someone else won't be very happy with it.
And, as Roy Rodgers once said regarding his land investments.... "they aren't making any more"  LOL
'68 DT1, '71 RT1, '71 JT1 (x2), '72 AT2 (x2), '74 DT250A, '75 XS650, '54 BSA C11G, '70 Honda CT70, '73 Hodaka Combat Wombat, '05 Moto-Guzzi Breva, '15 Triumph Tiger, +++

"We are mere custodians of mechanical things. Our job it to care for them, improve them and pass them on to others.” - Peter Egan
Last edit: 02 Mar 2023 04:42 by RT1.
02 Mar 2023 04:41 #8

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Replied by MarkT on topic RT Exhaust Silencers (add on)

In case my point wasn't clear... others have complained about the noise level of a completely stock pipe... pretty sure at least one member here sold his early 360 because he found it too obnoxious to ride where he lived.

You might find a round Skyway or other vintage muffler on Ebay that looks better than the modern silencers... possibly even a stock muffler off a newer bike could be added?

And don't underestimate the intake noise... it can be incredibly loud on the older models with the primitive airbox. . Back when I was stadium racing they instituted a "sound check" at Tech Inspection. Most racers were trying to add massive exhaust mufflers to meet the standard. I built a double walled insulated airbox that allowed us to pass the sound check without changing the muffler we were using. Most everyone else was using a pretty much open-top air filter with basic mud shielding.
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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02 Mar 2023 11:02 #9

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Replied by RT1 on topic RT Exhaust Silencers (add on)

There is definitely a level of subjectivity and tolerance involved.
'68 DT1, '71 RT1, '71 JT1 (x2), '72 AT2 (x2), '74 DT250A, '75 XS650, '54 BSA C11G, '70 Honda CT70, '73 Hodaka Combat Wombat, '05 Moto-Guzzi Breva, '15 Triumph Tiger, +++

"We are mere custodians of mechanical things. Our job it to care for them, improve them and pass them on to others.” - Peter Egan
03 Mar 2023 08:41 #10

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