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Old August 30th, 2021, 08:12 AM   #1
thedrewski86
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stock exhaust for full Yoshimura system

I would really like to trade somebody straight-up for my full Yoshimura exhaust system on my 2005 250. The right can is the hardest hit; left looks really nice and everything functions just fine. It's honestly a nice exhaust system but I just really don't care for loud bikes. This thing kinda sounds like a 450 motocross bike and that's not really my bag. I would prefer a set of the heavy old black or chrome cans these bikes came with. HMU with what you got, if you're in SoCal that's even better as shipping sucks for exhaust.



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Old August 30th, 2021, 09:35 AM   #2
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Ooooh ! I am tempted ! I have the stock pipes with a added muffler but also the stock muffler... (supposed to be much quiter ) are you interested ? their off a 2012 though dunno but I think they should fit.
Bob........
Unfortunately, pre-gen and new-gen exhausts are completely different.
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Old August 30th, 2021, 09:52 AM   #3
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Unfortunately, pre-gen and new-gen exhausts are completely different.
That's what I thought... I wish they weren't. I really like the 2 into 1 the new-gen utilizes.
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Old August 31st, 2021, 05:54 AM   #4
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I found some bashed up stock pipes on ebay super cheap. That being said, if anyone wants these just drop me a pm, they will be sitting once I get the new exhaust installed.
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Old August 31st, 2021, 01:42 PM   #5
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Would you mind weighing the Yosh system compared to stock?

I may have to take those off your hands. Wonder if there's way to install noise-reducing insert. Perhaps with some cutting & welding... hmmm....
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Old August 31st, 2021, 02:21 PM   #6
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Would you mind weighing the Yosh system compared to stock?

I may have to take those off your hands. Wonder if there's way to install noise-reducing insert. Perhaps with some cutting & welding... hmmm....
Yeah, I can do that. I'm sure they're a good bit lighter. From what I can gather, Yoshimura didn't make a db killer for these but they're pretty simple if you have some pipe and a welder. I ordered a silencer/insert for the Yoshi (RS3?? I think?) on my SV and it worked pretty well.

Here is what it looks like on the RS3 model:


No silencer:


Installed:


I was skeptical as to whether it would make a difference or not... it sure did though. Mufflers and the associated acoustics fall into the dark arts, I don't understand them but I like them quieted down. I'm glad this worked on my 650 at any rate.
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Old August 31st, 2021, 02:57 PM   #7
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hey, thanks! That looks like RS3 silencer for my CBR600RR system as well. Yeah, black magic for sure if you don't have CFD software. It seems like it wouldn't work because it's still straight-through pipe.

Although I'm on fence. I may just build 2-1 system as extra mid-range is what I'm really after. I've already got the later cams, but my 2002 is still too peaky and requires way more revs than my new-gen.
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Old August 31st, 2021, 03:03 PM   #8
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I can't tell for sure, but it looks like without the extra silencer the exhaust comes though some perforations and out the exit. The insert appears to make the gas go back toward the engine through a fairly tight clearance to get into its tube.
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Old August 31st, 2021, 03:45 PM   #9
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The Muzzy 2-1 is definitely what you want if all you're after is weight savings. This Yoshi is undoubtedly lighter but it's still a 2-can setup which is dumb imo.
Did I mention it's LOUD? Because if you want that... here ya go
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Old August 31st, 2021, 04:03 PM   #10
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Quote:
Originally Posted by Triple Jim View Post
I can't tell for sure, but it looks like without the extra silencer the exhaust comes though some perforations and out the exit. The insert appears to make the gas go back toward the engine through a fairly tight clearance to get into its tube.
If the insert is open-ended, it just shortens the baffled part of outer canister that's used. Gas entering inlet would take least-restrictive path, so sections on outside next to insert just won't be used because pressure on either side of baffling is balanced. So it basically shortens muffler and only section before insert is used.

Lemme draw picture...
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Old August 31st, 2021, 04:57 PM   #11
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Originally Posted by DannoXYZ View Post
If the insert is open-ended, it just shortens the baffled part of outer canister that's used. Gas entering inlet would take least-restrictive path, so sections on outside next to insert just won't be used because pressure on either side of baffling is balanced. So it basically shortens muffler and only section before insert is used.

Lemme draw picture...
Right, my problem is that I'm guessing about the gas flow path. But you don't need to bother making a drawing. (but I appreciate the thought)
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Old August 31st, 2021, 05:25 PM   #12
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well, I want to figure this black magic out too! I need to find some CFD lab time to figure out how and why the open end insert works.

I made 2nd insert for my CBR that was even quieter than Yosh one. Which made much more sense because it had closed end at beginning and forced air to flow around sides and through perforations to get into centre section and escape out end.

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Old September 1st, 2021, 12:54 AM   #13
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Add me next in line!!

I should've checked before lol because I've got some extra stock systems.
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Old September 1st, 2021, 08:29 AM   #14
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Add me next in line!!

I should've checked before lol because I've got some extra stock systems.
Noted, you're in the queue if Danno doesn't want to deal with them.

Danno, looks like those inserts would do a good job. You even have a little tunability if you drilled a small hole in the end-cap to allow different flow characteristics. That being said, I was surprised how much the factory insert from Yoshimura quieted down the bike. It did a lot for being as simple as it was.
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Old September 1st, 2021, 10:47 AM   #15
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Please give system to Singh2jz, I'm going to build my own 2-1 system.

The adjustability idea is behind Supertrapp mufflers. They have diffuser-end that accepts various numbers of washers to tune restriction and noise.
https://www.summitracing.com/parts/sup-344-1705
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Old September 1st, 2021, 11:22 AM   #16
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Add me next in line!!

I should've checked before lol because I've got some extra stock systems.
Well they're yours, and let me know what your situation is on stock mufflers. I just got my money refunded from Ebay for no reason... I guess the seller backed out. If you have a pair ready to go I will happily return the box full of loud Yoshi goodness.
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Old September 6th, 2021, 05:47 AM   #17
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Well they're yours, and let me know what your situation is on stock mufflers. I just got my money refunded from Ebay for no reason... I guess the seller backed out. If you have a pair ready to go I will happily return the box full of loud Yoshi goodness.
PM sent!
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Old September 6th, 2021, 10:56 AM   #18
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PM sent!
Received, take your time!

I got out for my first real test run this am (Palomar in SD Co. ) and boy do those Yoshis make this sound faster than it is I would be seriously tempted to keep them if it lived at 10k rpms all the time. Rev-matching in the turns at those rpms, quickly shifting from say 3rd to 4th or vice versa is absolute music. It sounds like a real race bike. Below 7k it sounds pretty uninspiring though... so just keep it pinned , you'll love 'em!
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Old September 7th, 2021, 04:24 PM   #19
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Received, take your time!

I got out for my first real test run this am (Palomar in SD Co. ) and boy do those Yoshis make this sound faster than it is I would be seriously tempted to keep them if it lived at 10k rpms all the time. Rev-matching in the turns at those rpms, quickly shifting from say 3rd to 4th or vice versa is absolute music. It sounds like a real race bike. Below 7k it sounds pretty uninspiring though... so just keep it pinned , you'll love 'em!
hahaha are you really sure you still wanna swap!? lol. what are your carb settings and intake setup?
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Old September 7th, 2021, 04:51 PM   #20
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hahaha are you really sure you still wanna swap!? lol. what are your carb settings and intake setup?
Bone stock carbs and intake. The only thing I've done to either has been clean, clean, and clean them again. Then cleaned them out once more... aaaaand they're good Oh, and 2.5-2.75 turns out on the idle screws, but once again that's factory spec to my knowledge.
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Old September 7th, 2021, 04:54 PM   #21
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Bone stock carbs and intake. The only thing I've done to either has been clean, clean, and clean them again. Then cleaned them out once more... aaaaand they're good Oh, and 2.5-2.75 turns out on the idle screws, but once again that's factory spec to my knowledge.
oh what that's wild! I thought needed tuning or something. well thats helpful then!
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Old September 20th, 2021, 07:53 AM   #22
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New pipes from Singh2jz:



Installed!



Yoshis are packed up in the box and going out tonight. I didn't have a scale handy to make a mass comparison between the two sets, but I can say the factory pipes are heavy. I don't mind, they're way worth it so I can hear myself think. I went for a rip around the block and it's just the sound I wanted.
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Old September 20th, 2021, 08:34 AM   #23
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Do the stock mufflers still have the four revets in each rear plate? Mine had been drilled out and it sounded like a lawn mower. I tapped the holes and put screws in, and they sounded nice and quiet.
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Old September 20th, 2021, 09:14 AM   #24
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Do the stock mufflers still have the four revets in each rear plate? Mine had been drilled out and it sounded like a lawn mower. I tapped the holes and put screws in, and they sounded nice and quiet.
Yes, thank goodness. Inderveer actually hooked me up with a really nice set Nothing has been modified on these and they're very quiet and solid, especially after I installed fresh coupler gaskets between the cans and headers. I suppose they could use a refresh on the paint but that doesn't bother me. This bike is purely function over form.
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