Anyone ever heard exhaust do this? w/ video
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Senior Member
SuperSport
SuperSport
Joined: Aug 2007
Posts: 524
From: Tarpon Springs, FL
Anyone ever heard exhaust do this? w/ video
Just fired up with the new Leo Vince slip ons, and it chirps (from the right side more than the left, if the left does it at all.) Anyone ever heard this before? I didn't have this with my microns or Jardines. It diminishes when you cover the tip with a cupped palm...
This also seemed to get better when it was fully warmed up. This vid was shot at probably 170 degrees. Almost felt like it was was on the suction pulse rather than the outward push pulse. This definitely occurred at the outlet tip, not inside the pipe as far as I can tell.
This also seemed to get better when it was fully warmed up. This vid was shot at probably 170 degrees. Almost felt like it was was on the suction pulse rather than the outward push pulse. This definitely occurred at the outlet tip, not inside the pipe as far as I can tell.
Last edited by Wolverine; Apr 14, 2013 at 02:57 PM.
the boss
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From: largo,fl
what in the world lol,i never heard that before.its something that is echoing thru the exhaust.
is the cam chain maybe a little tight,or dry valves etc.....
thats the best guess i have,hope someone has a better idea.
is the cam chain maybe a little tight,or dry valves etc.....
thats the best guess i have,hope someone has a better idea.
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SuperSport
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From: Tarpon Springs, FL
I don't think so b/c it did it prior to the manual cct install last week when I still had the stockers in there. It's def exhaust related. Maybe something isn't tightened all the way, not too impressed with the whole Leo Vince fitment compared to other brands I tried anyway. Might try pulling their quiet insert out.
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SuperSport
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From: Tarpon Springs, FL
Honestly you know what it reminds me of? A damn Volkswagen beetle exhaust. But those chirped under load all the way down the street, mine only does it at idle... I seriously think its the tip. I will have to grind off the screw because they tacked it in.
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From: South of Live Free or Die & North of Family Guy
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SuperSport
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From: Hamilton, Ontario, Canada
Drives you nuts, right? Mine does the same thing but not as badly. Maybe mine doesn't sound quite as bad because my hearing is shot.
I repacked the right muffler but repacking it didn't make a difference. I swapped the repacked muffler with one from the left side of the bike but it didn't make a difference.
Leo Vince is supposed to provide excellent technical assistance. It might be worth a call. I didn't bother.
I repacked the right muffler but repacking it didn't make a difference. I swapped the repacked muffler with one from the left side of the bike but it didn't make a difference.
Leo Vince is supposed to provide excellent technical assistance. It might be worth a call. I didn't bother.
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MotoGP
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From: NYC
Yeah, thats just like bigfoot or crop circles.
I only heard one similar sound where it turned out to be the sealing gaskets from pipe to silencer were perished. Make kinda a squeaky sound not too different.
I only heard one similar sound where it turned out to be the sealing gaskets from pipe to silencer were perished. Make kinda a squeaky sound not too different.
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Superstock
Joined: Jul 2009
Posts: 285
From: Snohomish, WA.
Well, I can tell you that when I fitted my new Leo's they did EXACTLY the same thing, and I couldn't have that.
Read my post in this thread:
https://www.superhawkforum.com/forum...t-ideas-28619/
What I did to fix it? I called Leo Vince factory, and told them what is going on, and that I was going to send them back due to "birds chirping in my exhaust on deceleration". They said they never heard of it happening before. So I googled "Leo Vince odd chirping noice on Decel", and got this;
1100GS Exhaust - ADVrider
and this
Exhaust noise bugging me.
and the list keeps going on...
So if you read the above thread what cured it was I ordered the conical end caps (Paid Xtra $60.00) with a larger dB killer and no more chirping. Size difference not much, 1.9375" to 2.125". Not sure why the other end caps do this but I assume it is because of the flat shape of the end of the muffler and the curved spigot creates a odd exhaust resonance that the conical end cap and slightly larger straighter dB killer does not.
Read my post in this thread:
https://www.superhawkforum.com/forum...t-ideas-28619/
What I did to fix it? I called Leo Vince factory, and told them what is going on, and that I was going to send them back due to "birds chirping in my exhaust on deceleration". They said they never heard of it happening before. So I googled "Leo Vince odd chirping noice on Decel", and got this;
1100GS Exhaust - ADVrider
and this
Exhaust noise bugging me.
and the list keeps going on...
So if you read the above thread what cured it was I ordered the conical end caps (Paid Xtra $60.00) with a larger dB killer and no more chirping. Size difference not much, 1.9375" to 2.125". Not sure why the other end caps do this but I assume it is because of the flat shape of the end of the muffler and the curved spigot creates a odd exhaust resonance that the conical end cap and slightly larger straighter dB killer does not.
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Superstock
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From: Snohomish, WA.
I didn't mention that before I replaced the end caps, I did take some Aluminum tape, (see photo below), and wrapped enough around the dB killer O.D. before inserting it so that the fit was t-i-g-h-t. It helped but did not completely cure it, before I replaced the end caps. (I also wrapped those).
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SuperSport
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From: Tarpon Springs, FL
But where you live, I guess Sasquatch is more fitting.Thanks a lot, a great deal of useful info there. Had I thought to type "chirping Leo's" into the search function, I'd have been surprised to read your post, for real.
Probably won't spend the extra $60 until I can't stand it anymore (which should be five minutes into my next ride.) But, what all was involved? Do you have to drill out the rivets around the end of the can and re-rivet the new conical ends on? And thanks for the photo of the tape, answers a great deal of questions for me...
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Superstock
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From: Snohomish, WA.
You can try the aluminum tape first, but yes you have to drill the rivets out, when replacing the end caps. Just make sure you have a good drill bit intended for stainless rivets and its a breeze. The conical caps and new dB killers come with new rivets. I made sure the strap overlaps at the bottom of the silencer just for a cleaner look. I like the look of the conical caps better anyway, but yea not free for sure. The others should not make this weird-*** bird chirp to begin with IMHO.
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From: Lake View Terrace, CA
It is funny that my Leos don't make any strange noises.... but I also do not run either of the inserts.
Also on the fitment comment, the Leos I installed are one of the best fitting slip-on system I have used.
Also on the fitment comment, the Leos I installed are one of the best fitting slip-on system I have used.
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SuperSport
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From: Tarpon Springs, FL
You can try the aluminum tape first, but yes you have to drill the rivets out, when replacing the end caps. Just make sure you have a good drill bit intended for stainless rivets and its a breeze. The conical caps and new dB killers come with new rivets. I made sure the strap overlaps at the bottom of the silencer just for a cleaner look. I like the look of the conical caps better anyway, but yea not free for sure. The others should not make this weird-*** bird chirp to begin with IMHO.
When you talk about the overlap, did you use the old holes, or do the new endcaps not line up anyway, requiring new holes to be drilled?
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SuperSport
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From: Tarpon Springs, FL
Now that they've had a few heat cycles, things are sealing nicely that I thought were going to be problematic. I admit they mounted up easily, I just loved my Jardines. I had an aversion to "Slip fit with springs" rather than clamps, but these are well made, which is why the diesel chirp is so surprising. And I bet lots of pipes don't have this quirk, and your sets fine. Let me ask you, did you cut the bit of extra pipe from the stock front header that extends into the Y collector and looks like it restricts flow? Do you have stock headers? Reason I ask is because my left side doesn't chirp, and the right side does (another reason I believe not everyone experiences this phenomenon.) I was just thinking this could be part of the the problem if it is indeed a resonance issue.... Also I might swap the left/right and see what happens. And I'm also gonna try no inserts at all, see how loud my neighbors can stand it.
Last edited by supermarto; Apr 14, 2013 at 03:44 PM.
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SuperSport
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From: Tarpon Springs, FL
It drove me nuts too.And I agree about the commercial.
We essentially ride mean sounding, throaty roaring twins. To have it go RRROAR-tweet tweet tweet is NOT cool.
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Superstock
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From: Snohomish, WA.
Super,
The holes on the silencer/end cap line up with the new end caps just fine. The silencers are really nice, and yes they do not make any objectionable noise with the db killers not installed, only with them in. Which is why it has to be the design of the db killer inconjunction with the flat end cap. But don't quote me on that, its just an educated guess.
I just perferred to have the db killers in vs. out because it is the perfect compromise between stock and aftermarket. The conical end caps with db killers are slightly louder too than the flat end caps with turned down spigots/db killers fyi.
I also like the fact that LEO give you the choice of NOT installing any decals on the silencers if you perfer it that way.
The holes on the silencer/end cap line up with the new end caps just fine. The silencers are really nice, and yes they do not make any objectionable noise with the db killers not installed, only with them in. Which is why it has to be the design of the db killer inconjunction with the flat end cap. But don't quote me on that, its just an educated guess.
I just perferred to have the db killers in vs. out because it is the perfect compromise between stock and aftermarket. The conical end caps with db killers are slightly louder too than the flat end caps with turned down spigots/db killers fyi.
I also like the fact that LEO give you the choice of NOT installing any decals on the silencers if you perfer it that way.
Last edited by Upland111; Apr 14, 2013 at 06:28 PM.
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SuperSport
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I just perferred to have the db killers in vs. out because it is the perfect compromise between stock and aftermarket.
Last edited by supermarto; Apr 14, 2013 at 09:19 PM.
Member
Superstock
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From: Snohomish, WA.
If you prefer it louder, that is correct.
The Leo's are in fact as 8541 says, quieter than other makes even with the db killer removed.
The Leo's are in fact as 8541 says, quieter than other makes even with the db killer removed.
Last edited by Upland111; Apr 14, 2013 at 09:57 PM. Reason: Sound volume compared to other makes
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From: Lake View Terrace, CA
I knew you had Leo's, almost pm'd you...
Now that they've had a few heat cycles, things are sealing nicely that I thought were going to be problematic. I admit they mounted up easily, I just loved my Jardines. I had an aversion to "Slip fit with springs" rather than clamps, but these are well made, which is why the diesel chirp is so surprising. And I bet lots of pipes don't have this quirk, and your sets fine. Let me ask you, did you cut the bit of extra pipe from the stock front header that extends into the Y collector and looks like it restricts flow? Do you have stock headers? Reason I ask is because my left side doesn't chirp, and the right side does (another reason I believe not everyone experiences this phenomenon.) I was just thinking this could be part of the the problem if it is indeed a resonance issue.... Also I might swap the left/right and see what happens. And I'm also gonna try no inserts at all, see how loud my neighbors can stand it.
Now that they've had a few heat cycles, things are sealing nicely that I thought were going to be problematic. I admit they mounted up easily, I just loved my Jardines. I had an aversion to "Slip fit with springs" rather than clamps, but these are well made, which is why the diesel chirp is so surprising. And I bet lots of pipes don't have this quirk, and your sets fine. Let me ask you, did you cut the bit of extra pipe from the stock front header that extends into the Y collector and looks like it restricts flow? Do you have stock headers? Reason I ask is because my left side doesn't chirp, and the right side does (another reason I believe not everyone experiences this phenomenon.) I was just thinking this could be part of the the problem if it is indeed a resonance issue.... Also I might swap the left/right and see what happens. And I'm also gonna try no inserts at all, see how loud my neighbors can stand it.
Well mine replaced my Erions so they are quiet by comparison....
The one question I would ask is do you have the flat disk with the holes drilled in it in front of the muffler? or just the rear insert?
As for mine I run them open. I have removed the bit in the "Y" section and done a few other things to it but it is basically a stock header and don't think that would cause your issues.
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I had a similar sound on my Aprilia. Not quite a chirp but more of a tick sound. Turns out it was the hole that the DB killers bolt through. Without them in it will tick. Could there be a hole in the db killer that the air is blowing by causing the tweet? The fix for mine would be putting a bolt in it.
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SuperSport
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From: Tarpon Springs, FL
Well mine replaced my Erions so they are quiet by comparison....
The one question I would ask is do you have the flat disk with the holes drilled in it in front of the muffler? or just the rear insert?
As for mine I run them open. I have removed the bit in the "Y" section and done a few other things to it but it is basically a stock header and don't think that would cause your issues.
The one question I would ask is do you have the flat disk with the holes drilled in it in front of the muffler? or just the rear insert?
As for mine I run them open. I have removed the bit in the "Y" section and done a few other things to it but it is basically a stock header and don't think that would cause your issues.
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If I remember correctly you are supposed to run them together.
Personally I pulled the inserts out before I ever mounted them up.
They really are not that loud..... you have to try to set off the car alarms
unlike the Erions which would do it just idling by.... 
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SuperSport
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From: Tarpon Springs, FL
From another forum:
My LV's came with two disks - I asked the folks at Leo Vince if it was better to run it with the disks and no baffles or with the baffles and no disks - here is their reply...
####
The sound insert alone will be louder than the discs alone. The discs are
more restrictive. In the real world, the bikewill usually do best with the
sound insert and no discs. This is the best balance as it will still run
well, but not be obnoxiously loud. If you have any questions, let me know.
Thanks,
Manny Hauswirth
Electronics Development Manager
Road Race Support Manager
Leo Vince USA
So no, I think its either or, or both, or neither.
My LV's came with two disks - I asked the folks at Leo Vince if it was better to run it with the disks and no baffles or with the baffles and no disks - here is their reply...
####
The sound insert alone will be louder than the discs alone. The discs are
more restrictive. In the real world, the bikewill usually do best with the
sound insert and no discs. This is the best balance as it will still run
well, but not be obnoxiously loud. If you have any questions, let me know.
Thanks,
Manny Hauswirth
Electronics Development Manager
Road Race Support Manager
Leo Vince USA
So no, I think its either or, or both, or neither.
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Superstock
Joined: Jul 2009
Posts: 285
From: Snohomish, WA.
Super,
You are correct, you can insert either restrictor plate, or baffle, or both, or open. I just have the baffle installed, not the resrictor plate.
I asked the factory the same question when I was inquiring about the noise.
It makes sense the the restrictor places would whistle, but not the db killers. Reminds me of the Glass Packs they used to sell at Shucks Auto supply in the mid-late 70's, with a perforated plate about mid way down, The "Red Bombs", but my friend and I called them "Whistling Petes". Don't ask me how I know. But probably not too many members here remember those jewel of a glass pack.
You are correct, you can insert either restrictor plate, or baffle, or both, or open. I just have the baffle installed, not the resrictor plate.
I asked the factory the same question when I was inquiring about the noise.
It makes sense the the restrictor places would whistle, but not the db killers. Reminds me of the Glass Packs they used to sell at Shucks Auto supply in the mid-late 70's, with a perforated plate about mid way down, The "Red Bombs", but my friend and I called them "Whistling Petes". Don't ask me how I know. But probably not too many members here remember those jewel of a glass pack.
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SuperSport
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From: Tarpon Springs, FL
LOL. Well I'm gonna run them uncorked for a while. I'd imagine the disks wouldn't make too much noise being down the silencer in front of the packing and whatnot. But they do look very restrictive. I had no intentions of running them.
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Superstock
Joined: Aug 2013
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From: Everett, Washington
My Leos make an awful racket. It sounds like someone shaking a tambourine back there. The bike shop installed them and did a rejet at that time. I don;t think I have any restrictors in the cans as I took the right one off and I can look through the center tube from both ends. I've never seen any plate with holes in it, I assume the dealership took them off.
I thought the dealer was f**king with me and put something down in the header pipes. I tried fishing around with a magnet and I found nothing. I shook the can as violently as I could and couldn't get a rattle out of it.
The support guy at LV claims to never have heard of this issue. The dealer says the cans are defective and I should have gotten an exhaust system from them. I'm stuck in the middle. The pipes make a good sound if I ignore the rattle noise. Anyone have any ideas?
I thought the dealer was f**king with me and put something down in the header pipes. I tried fishing around with a magnet and I found nothing. I shook the can as violently as I could and couldn't get a rattle out of it.
The support guy at LV claims to never have heard of this issue. The dealer says the cans are defective and I should have gotten an exhaust system from them. I'm stuck in the middle. The pipes make a good sound if I ignore the rattle noise. Anyone have any ideas?
