Topic: Does this look right..

[Retro Rocket]

Why would anyone build an exhaust without a tab to support the rear part of pipe..or maybe at least supply a nice clamp.?

With eyes like that Frank i'm not surprised you can't see the mounting tab....

[grcamna2]

Why would anyone build an exhaust without a tab to support the rear part of pipe..or maybe at least supply a nice clamp.?

With eyes like that Frank i'm not surprised you can't see the mounting tab....

lol 
Reminds me of the character in the movie 'Mr. Deeds' w/ Adam Sandler,the guy in that small NH. town that 'Deeds' is from, character name "crazy eyes" played by actor Steve Buscemi LOL  no offense intended

[754]

Ah , yes I see that now...... My tabletvshows things in negative form...wore out..
 But i remember a few guys on here that actually ran them on 500/550,s without rear mounts..

[Old Moe Toe]

Why would anyone build an exhaust without a tab to support the rear part of pipe..or maybe at least supply a nice clamp.?

I've got one of Carpy's 4 into1 pipes that has no tabs to support the rear.I was assured when I bought it that it would not fall off due to this...and it is quite a light weight pipe. Ideal if you want to eliminate the rear foot pegs and brackets. Perhaps they do not sit as far back as the pipes in question. However I do not use it as it is so loud you feel like "MR CONSPICUOUS" riding around with it and know the first cop you pass will want to give you a fine.

[Retro Rocket]

What about this??? http://www.motogpwerks.com/shop/exhausts/version-1-4-1-system/honda/cb400f-1974-1976.html

Its a placeholder for his systems. Maybe he does has jigs for 400s.  You can email him and make an inquiry. His name is Chris and he's a busy guy. May come across as "abrupt" but he's not intending to be. Just busy. Makes really high quality stuff, and its very well-engineered too.

I think Chris has made the Kaz Yoshima 400 pipes at some stage, I'm sure i've seen them somewhere...

[seanbarney41]

Ah , yes I see that now...... My tabletvshows things in negative form...wore out..
 But i remember a few guys on here that actually ran them on 500/550,s without rear mounts..

The original Yoshimura pipes had no mounting tab.  Never seen Motogpwerks pipe in real life, but I would imagine they are as lite or lighter.  I ran a similar weight and length exhaust for a few years, 10's of thousands of miles, had it on and off numerous times, never even messed with studs, just used socket head cap screws and it was absolutely no problem.  If you think about it, 8 times 10mm bolts engaged at least to a depth of at least 25mm?...you would have to be quite the ham fisted mutton head for anything to go wrong.

[sbeckman7]

Spoke to him on the phone today (Aussie accent)? Can't remember if he said his name was Chris or if he just worked with Chris. Nice guy either way, said he can do 350/400F pipes similar to the yoshi but not exactly. He will be sending some pictures to me later today and I'll be happy to post them here when I receive them.

[Retro Rocket]

Spoke to him on the phone today (Aussie accent)? Can't remember if he said his name was Chris or if he just worked with Chris. Nice guy either way, said he can do 350/400F pipes similar to the yoshi but not exactly. He will be sending some pictures to me later today and I'll be happy to post them here when I receive them.

Chris is a Kiwi {New Zealand}, Here's the pipe...

https://www.facebook.com/motogp.werks/posts/1274894819193503

[sbeckman7]

Spoke to him on the phone today (Aussie accent)? Can't remember if he said his name was Chris or if he just worked with Chris. Nice guy either way, said he can do 350/400F pipes similar to the yoshi but not exactly. He will be sending some pictures to me later today and I'll be happy to post them here when I receive them.

Chris is a Kiwi {New Zealand}, Here's the pipe...

https://www.facebook.com/motogp.werks/posts/1274894819193503

Thanks for the link!  That's a sweet pipe... not sure if the angle would make it difficult to add a muffler but the quality seems unbeatable for the price.

[Retro Rocket]

Spoke to him on the phone today (Aussie accent)? Can't remember if he said his name was Chris or if he just worked with Chris. Nice guy either way, said he can do 350/400F pipes similar to the yoshi but not exactly. He will be sending some pictures to me later today and I'll be happy to post them here when I receive them.

Chris is a Kiwi {New Zealand}, Here's the pipe...

https://www.facebook.com/motogp.werks/posts/1274894819193503

Thanks for the link!  That's a sweet pipe... not sure if the angle would make it difficult to add a muffler but the quality seems unbeatable for the price.

Muffler/baffle is inside the pipe, places like Cone engineering have the parts to make a quieter baffle if its needed...

[sbeckman7]

Good to know.  Does anyone know why the design of these is so much further away from the bottom of the engine/frame?  Seems like they give up a great amount of ground clearance.  Possibly for primary runner length?

[Retro Rocket]

Good to know.  Does anyone know why the design of these is so much further away from the bottom of the engine/frame?  Seems like they give up a great amount of ground clearance.  Possibly for primary runner length?

Yes, tuned length. That pipe is a copy of the actual Kaz Yoshima race pipe, thats how they were made...

http://forums.sohc4.net/index.php?topic=11879.0

Half way down the page

[Kenzo]

Ah , yes I see that now...... My tabletvshows things in negative form...wore out..
 But i remember a few guys on here that actually ran them on 500/550,s without rear mounts..

The original Yoshimura pipes had no mounting tab.  Never seen Motogpwerks pipe in real life, but I would imagine they are as lite or lighter.  I ran a similar weight and length exhaust for a few years, 10's of thousands of miles, had it on and off numerous times, never even messed with studs, just used socket head cap screws and it was absolutely no problem.  If you think about it, 8 times 10mm bolts engaged at least to a depth of at least 25mm?...you would have to be quite the ham fisted mutton head for anything to go wrong.

Was the original Yosh a two piece design? The MotoGP Werks is so rear tab/mount is pretty much required to keep the tailpipe from rotating. Only two exhaust springs preventing it from rotating.

Good to know.  Does anyone know why the design of these is so much further away from the bottom of the engine/frame?  Seems like they give up a great amount of ground clearance.  Possibly for primary runner length?

The exhaust is pretty much centered under the bike so no loss in leaning the bike over in turns but curb jumping is not recommended.

Cheers,
Kenzo

[sbeckman7]

Cool, good to know!  Have to try to get one of these for the cool factor if nothing else

[Kenzo]

Cool, good to know!  Have to try to get one of these for the cool factor if nothing else

Just remember it's a race exhaust design, meaning when you give it a handful of throttle it will wail. Personally the sound of these fours is music to my ears. I'm new to this scene but the whole reason I went with a four over a big twin is the engine sound.

Cheer,
Kenzo

[sbeckman7]

Cool, good to know!  Have to try to get one of these for the cool factor if nothing else

Just remember it's a race exhaust design, meaning when you give it a handful of throttle it will wail. Personally the sound of these fours is music to my ears. I'm new to this scene but the whole reason I went with a four over a big twin is the engine sound.

Cheer,
Kenzo

Thanks for the heads up Kenzo, and wow what a bike you have!  This won't be a bike I ride for long periods of time so I'm happy for a little more audible excitement   It can't be louder than my Triumph at the moment 

Chris sent a few more pics to me.  These pictures removed any ambivalence I was feeling earlier!

[seanbarney41]

original yosh was a one piece pipe, I think MGPWerks earlier designs were too...I see what you mean about it rotating without a rear tab

[seanbarney41]

original yosh was a one piece pipe, I think MGPWerks earlier designs were too...

2 piece Sean, I have one....

you have a hand bent Yoshimura?  I do.  It is one piece

[754]

I had a couple Yoshis ..fitment unknown..that I thought were 3 pce.. ..maybe mistaken ?
 One the S pipes had bends, one was just welded.. One had a bit of a can on the end..

 Myself I think the ones shown on here would look way better with a megaphone on the end.... Just too long a pipe of same diameter looks funny..

Pic of a Yoshi 3 pce header added..

[Retro Rocket]

original yosh was a one piece pipe, I think MGPWerks earlier designs were too...I see what you mean about it rotating without a rear tab

I deleted my earlier post  by accident...

The early Motogpwerks pipes were 2 piece Sean, I have one......

[FunJimmy]

The original Yoshimura pipes had no mounting tab.  Never seen Motogpwerks pipe in real life, but I would imagine they are as lite or lighter.  I ran a similar weight and length exhaust for a few years, 10's of thousands of miles, had it on and off numerous times, never even messed with studs, just used socket head cap screws and it was absolutely no problem.  If you think about it, 8 times 10mm bolts engaged at least to a depth of at least 25mm?...you would have to be quite the ham fisted mutton head for anything to go wrong.

If that where true you could use the exhaust as a jack point but it's not.
Those are 6mm studs and I would feel more confident with the rear hanger than without.

[seanbarney41]

The original Yoshimura pipes had no mounting tab.  Never seen Motogpwerks pipe in real life, but I would imagine they are as lite or lighter.  I ran a similar weight and length exhaust for a few years, 10's of thousands of miles, had it on and off numerous times, never even messed with studs, just used socket head cap screws and it was absolutely no problem.  If you think about it, 8 times 10mm bolts engaged at least to a depth of at least 25mm?...you would have to be quite the ham fisted mutton head for anything to go wrong.

If that where true you could use the exhaust as a jack point but it's not.
Those are 6mm studs and I would feel more confident with the rear hanger than without.

you are right, my bad...but my point is still the same,  and I always meant to make a rear hanger in the beginning, 2000 miles later and everything is fine, why bother


...oh and I have used the exhaust as a jack point too, really scary, but also did not hurt anything

and it turns out we are both wrong...8mm
http://www.cyclepartsnation.com/oemparts/a/hon/506b8bc6f870023420a1e8b7/cylinder-head

guessing, and vaguely remember, the 550's have 6mm?...that would be sketchy

[FunJimmy]

...the 550's have 6mm?...that would be sketchy

Both intake and exhaust studs on the 5x0 are 6mm.

Yes the 550's are in fact 6mm.
My knowledge is limited to the we little bikes.
Sorry for misleading.

[alacrity]

M6 studs on 550… 8 of em.  all together not super strong but it's a very light thin wall one piece pipe.

Carpy says the pipe is "Fine" without a hanger or clamp in the back.
Maybe.

I ran it that way for 500 miles.  Started to feel more vibration one day.  The pipe had gotten slightly loose but was not allowing air leak… just enough from the tail wagging the dog that it battered the copper covered exhaust flange gaskets flat.

I pulled it, replaced the gaskets, fitted a tail collar (exhaust P-Clamp) and hung that via a steel strap from the rear peg. 3k more miles (till a crash) and it was perfect.

Maybe it was me riding it "hard…" Maybe it was our crappy Los Angeles infrastructure with super/bumpy hard edged potholed etc.  Maybe it needed a clamp in the first place.  You be the judge.

[Retro Rocket]

Considering that steel studs secure the exhaust into aluminum, I would ALWAYS run a rear mount....