Topic: New CB750 4-4 pipes: your thoughts and opinions?

[swellguy]

Don't want to do those things...

I don't blame you. But he did manage a set for a DOHC and kept the center stand:

[Bob750]

Don't want to do those things...

I don't blame you. But he did manage a set for a DOHC and kept the center stand:

Now we're talking.
I heard the sound of those on that video.  Like buddah!

[Duke McDukiedook]

Yes, center stand must stay.

So say we all. 

[Hush]

It looks like if those Benji pipes were "tweeked" that the centre stand could have stayed!
The lower pipe needs to roll out an inch either side, looks like there is room for it to do that.

[petercb750]

When I finally get round to building my cafe, those pipes just might have to be an essential..........

[greenjeans]

Try these guys:   http://www.coneeng.com/

Can't remember his name - I think It's Kevin.     All the stainless muffler parts you'd ever need.  Still have to get the header pipes sourced & bent.

[HondaMan]

Try these guys:   http://www.coneeng.com/

Can't remember his name - I think It's Kevin.     All the stainless muffler parts you'd ever need.  Still have to get the header pipes sourced & bent.

Excellent start, Greenjeans! I'll be talking with them soon. 

[BobbyR]

Benji just built me a set of 4 into 4 pipes for my 73 cb750 cafe project:

What's the going rate on those stainless ones, if I may ask?

Bravo, those Benji pipes are works of art. They capture the flavor of the original with an updated look. The centerstand is a problem that could be worked out.

[Bob750]

Try these guys:   http://www.coneeng.com/

Can't remember his name - I think It's Kevin.     All the stainless muffler parts you'd ever need.  Still have to get the header pipes sourced & bent.

Those stainless pipes I understand are 100% stainless from engine to smoky hole.

[MaaseyRacer]

These guys are doing 4-4 as well.


Taken from:
http://www.bikeexif.com/honda-cb750

Site:
http://rockers.sub.jp/

[wannabridin]

those are full Ti pipes, and they cost about 4K, so quite out of the price range of nearly anyone

[Bob750]

What's the round thing just forward of the points cover?  Is that a relocated horn, cuz the oil cooler would have taken up that space?

[swellguy]

What's the round thing just forward of the points cover?  Is that a relocated horn, cuz the oil cooler would have taken up that space?

I think it is a relocated horn.

[fastbroshi]

Beautiful pipes, but awkward stance.  Looks like they raised both ends at least 3".

[spitcrazy]

I am sure I would dig up the coffee can in  the backyard and find the money, or sell bits of my flesh to feed starving puppies for a set of the proposed pipes. If they fit a 500 that is.

[754]

I dont know why you guys cant get over the c-stand 9except0 on a stocker..
 I run solid pegs off the passenger peg mount.. billet with 1/2 in ID centrehole. I run a T stand off that to hold the bike up.. way lighter than sidestand.. 2 of these will lift the rear wheel & allow removal..

 If you dont  like the t shape. make triangles with a pin welded in a corner.. 2 of them.. slickest way to remove wheel.. OEM oscure HD part BTW..

[petercb750]

Agreed 754, not having a c-stand is not as bad as some make it out to be. You do get accustomed to it and work around it. And it's amazing how it cleans up the look.
Peter.

[Duke McDukiedook]

I dont know why you guys cant get over the c-stand 9except0 on a stocker..
 I run solid pegs off the passenger peg mount.. billet with 1/2 in ID centrehole. I run a T stand off that to hold the bike up.. way lighter than sidestand.. 2 of these will lift the rear wheel & allow removal..

 If you dont  like the t shape. make triangles with a pin welded in a corner.. 2 of them.. slickest way to remove wheel.. OEM oscure HD part BTW..

Could you post a pic or two of this setup to ease our weary minds?

[754]

 I will describe..
 Rear peg has 1/2 in hole inside the end.

 The workstands have a triangle shape. From top of trianle to grond is 1 1/2 inches higher than the height of the peg hole with bike sitting level. At the top of the triangle, there is a 1/2 diameter peg welded on at 90 degrees this has to have a bit of clearnce to peg hole , to prevent seizing.
 Now insert one side, triangle is  tipped back at crazy angle lean bike over, it swings into place. Then do same on other side.

 Brcause my bike was so low, I carried a  4.5 inch long  T shaped one in my pocket and use it as a sidestand, but cafe or roadracers are too high for the carryon stand.
 

[faux fiddy]

http://www.elsberg-tuning.dk/the%20bikes.html

Anybody around SOHC doing this yet?  Some sandlot racer garages  are doing hydroforming in their own shops.

[Bob750]

Wow, looks like a high-wattage tweeter in the end of that thing...

But seriously... that is cool: a hydroformed muffler. There must be a way to change the pattern a little so as to eliminate the little ruffle at the wide end that makes it look a little cheap. Some crazy mathematician should be able to figure the best pre-blast shape to make it look perfect after the water is pumped in. I can see where they tried to hammer out the funny-ness at the butt end; it'd be cool to eliminate that necessity.

Are these pressurized in a mold or in a safety box or just out in the open?

[faux fiddy]

A : Pressurized in open, to the best of  my knowledge with  water tight welds and a fitting.


Air explodes so that doesn't work. I think this is water which is not as big a safety problem, I kinda doubt it's done with hydraulic fluid but I don't really know.  Fluids don't explode, they just spray everything.

I guess the ends could always be choped off and more stylish ends made to rivet on that would give access to baffles.


If there was some sort of jig you set them in you could probably even form some of  the clearances for shocks, shifters, etc.

[faux fiddy]

For price,  it would be hard to compare what work  it would be worth and what it cost to set up to do it, against the demand. If there was a poll choice for $600 that would probably be the most selected, and more would sell.

And to compare, a friend paid $700 for custom made  expansion chambers and pipes  (mabe a bit harder to make) for his Kawasaki Triple so 4/3's that price would be under a grand.  The only problem is he didn't get them delivered yet, and has kind of given up.

[mycb750k6]

Hondaman,
My experience has been with HM300s mainly. I bought a set from the ebay reseller in Oregon that were 990 including shipping for the pipes alone. The chrome was horrible and I needed a giant mallet to get them on - and they still want to spring off the spigots.

My most recent set came from DS spares. I'd bought single 341s from them in the past and they had better quality. This time I told them I was building a show bike and send me nice ones. And they certainly did. The chrome is amazing and they went together without the slightest effort and fit perfectly. I bought the entire kit but the pipes alone cost just $1000.

So when you say Honda pipes, it's unclear who is making those pipes and who is making the DS pipes or those from Oregon. I know the Yamiya boys claim their pipes were scrupulously reproduced from the start which I assume means they made their own.

[Rio_CB750]

I passed this thread onto a friend of mine who is a manufacturer's representative with mostly companies from China.

His initial response is "min order on parts like that is 1,000 units, sometimes more, rarely less..."  he said "do the math" and "you'd be better off looking in the US for a custom exhaust manufacturer that can do custom work, you can walk into his shop, see his work, know where he lives, so you don't lose your shirt"...  anyway, just HIS 2 cents...  sorry for being Debbie Downer.