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Put the full Akra system on today..sounds so much better, quicker through the gears and picked up an extra 5mph on top speed.

ED427886-74D2-440E-8E1A-C87372294A06.jpeg
 

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Has anyone tried installing the Akrapovic Slip-On to the stock head pipe?

I've found that mine simply does not clamp tight enough no matter what I've tried. Even with the C-clamp screw fully screwed in, I can easily remove it with one hand with little effort. Obviously there's a ton of leak. I have a hard time believing Akrapovic would mess things up that bad. Am I missing something?
 

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I find the contrast quite important between the beautiful finish of the 2 mufflers exhaust and tubing (3 welds while a bending could be possible). and what about this round appendix !! but this is just a personal opinion and I do not question the quality or effectiveness of Akra products worldwide.
it goes with the tastes and the choice of each one. Fortunately, because if we all had the same products and the same opinions, life would be very sad.:wink:

 

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I find the contrast quite important between the beautiful finish of the 2 mufflers exhaust and tubing (3 welds while a bending could be possible). and what about this round appendix !! but this is just a personal opinion and I do not question the quality or effectiveness of Akra products worldwide.
it goes with the tastes and the choice of each one. Fortunately, because if we all had the same products and the same opinions, life would be very sad.:wink:

That round piece has to be a heat shield. I actually think the design is quite clever to fit a long head pipe in such a short space.
 

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That round piece has to be a heat shield. I actually think the design is quite clever to fit a long head pipe in such a short space.
You're wrong Tooter. You see the guys at Akrapovic both like Top Gear and french cuisine and because it's a Monkey they decided to do something funny.
What they came up with is internally called a RAC or Rôtissoire à Camembert. You open the little box, put your camembert cheese in it then go for a 14 minute ride in second gear keeping it between 7 & 8K rpm. Please note the engine has to be at operating temperature for best results. Et voila, enjoy your camembert rôti! :tennis:
 

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That round part is an exhaust resonator. It helps eliminate certain sound frequency at certain rpm. In terms of sound, build and design engineering, it is proof that Akra goes above and beyond what other companies do...
 

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That round part is an exhaust resonator. It helps eliminate certain sound frequency at certain rpm. In terms of sound, build and design engineering, it is proof that Akra goes above and beyond what other companies do...
That's interesting. :) How did you find this out?






My Flowmaster truck muffler is this exact model which uses two Helmholz resonating chambers to attenuate certain sound frequencies, but they're inside the muffler. It's all stainless steel so it never goes bad, never wears out, and never changes how it sounds... which is great! :) Is there any actual opening between that disk and the interior of the exhaust tubing, or is it only attached to the outside?

 

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Has anyone tried installing the Akrapovic Slip-On to the stock head pipe?

I've found that mine simply does not clamp tight enough no matter what I've tried. Even with the C-clamp screw fully screwed in, I can easily remove it with one hand with little effort. Obviously there's a ton of leak. I have a hard time believing Akrapovic would mess things up that bad. Am I missing something?
Akrapovic doesn't include a new exhaust gasket, which they should, because gaskets are a consumable and the original can crack or crumble when removing the original silencer. It can also get stuck in the silencer, even though it is meant to stay with the header/cat. They don't mention anything about this in their instructions linked here, and they don't include any pictures that show the gasket in place.

Fortunately, Honda has been using the same gasket (Honda part number 18391-HB7-000) on dozens of models dating back to the 60's or 70's, so finding one cheap and in stock if yours is damaged shouldn't be a problem.

https://www.partzilla.com/product/honda/18391-HB7-000?ref=2795ec2796a688ddab6a3264a7ac31ce28aa41af

Interestingly, Yoshimura's instructions explicitly say to remove the muffler gasket, and that it will not be used with their slip-on.
 

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I know because Akrapovic has been installing resonators on all their super cross bike headers for some time now. Check out the bent cylinder resonator on this KTM header.

37999299-7E15-4028-B40E-67EC5BFF6EA7.png
 

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Here is a close up shot of the small connection between then header and resonator. Exhaust and sound goes in, bounces around and changes the characteristics of the exhaust tone.
50B9FA5B-9B8F-48B1-9509-40053F51F99C.jpeg

Have a a little over 100 miles on it now. Engine runs much better after I installed PCV and WB2. The raspy note noticeable mainly on deceleration is now gone. Some kind of fuel controller is necessary after letting the motor breath.
 

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Here is a close up shot of the small connection between then header and resonator. Exhaust and sound goes in, bounces around and changes the characteristics of the exhaust tone.
View attachment 81344

Have a a little over 100 miles on it now. Engine runs much better after I installed PCV and WB2. The raspy note noticeable mainly on deceleration is now gone. Some kind of fuel controller is necessary after letting the motor breath.
Thanks for the informative pic. The connection was very cleverly hidden. :)
There HAS to be a physical opening into an exhaust system to enable a Helmholz resonator to operate.
 

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Wow really? For a resonator to work it has to be connected to the exhaust and not sitting on the shelf in your garage? What a revelation.
 

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In Quibbly's eager rush to quibble...



...he neglected to read that the connection has to be into the exhaust, not just stuck onto the outside surface. That's the little tube hidden behind the mount connecting the two together.
 

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tooter you're so full of shit it makes my brain hurt.


your first post here was that it MUST be a heat shield. then upon hearing it's a resonance chamber you try to play the smart card.


go fuck yourself you stupid old bastard.


of course it's connected to the piping. what good would welding a chamber on to the exhaust be without connecting it into the piping?!


i'm done with you. i wish there was a go fuck yourself you stupid old cunt block function, but sadly there isn't so im stuck with seeing your old fuck ramblings about your shitty bike economy in every goddamn post. whether it has any relevance whatsoever or not. fucking hell.


the worthlessness of your opinions knows no bounds.
 

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In Quibbly's eager rush to quibble...

...he neglected to read that the connection has to be into the exhaust, not just stuck onto the outside surface. That's the little tube hidden behind the mount connecting the two together.
tooter you're so full of shit it makes my brain hurt.

your first post here was that it MUST be a heat shield. then upon hearing it's a resonance chamber you try to play the smart card.

go fuck yourself you stupid old bastard.

of course it's connected to the piping. what good would welding a chamber on to the exhaust be without connecting it into the piping?!

i'm done with you. i wish there was a go fuck yourself you stupid old cunt block function, but sadly there isn't so im stuck with seeing your old fuck ramblings about your shitty bike economy in every goddamn post. whether it has any relevance whatsoever or not. fucking hell.

the worthlessness of your opinions knows no bounds.
You two need to get a room and stop cluttering up threads with the bullshit. I'm very new to this forum, but I've already seen this bickering a handful of times. It's getting old guys. You're both adults, right? So can't we just act like adults and ignore each other?

I'm all for calling somebody out when they're wrong because spreading misinformation on a forum is so bad, but this isn't the way to do it.
 

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He's a dumbass. He just wants to post pics of his shitty bikes, talk about his ecu on big bore threads, make self indulgent posts, and feed his confirmation bias. He's one of the lowest contributors I've ever come across.

He's posted about his fuel economy in almost every thread on here. What an idiot.

That's all...
 
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