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Help ID 4/2 exhause, please. 17 Mar 2024 04:41 #896510

  • slmjim+Z1BEBE
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Came to us in a parts lot from a local bike shop that focused mostly on Kawasaki in the day.  Seller / owner retiring & liquidating the shop for health reasons.  He's pretty sure it's a Bassani circa early-mid '80's that fits a KZ550.

Looks like it's never been run.  Very minor surface rust on inside of pipes.  Shelf wear / minor scratching in the black finish.  No dents.  No hardware.  No markings / #'s / or anything that could ID it, just blank metal.  Fine welds. What appears to be a sidestand stop on the left side connector pipe.  No mufflers came with.











Center-to-center of 1/2 and 3/4 headpipes is ~88mm -  ~3 1/4in.
OD of headpipe collars is. 40mm
OD of collector(s) out is 48mm.
OD of connector pipes is 48mm.

This is too nice a system to scrap. First reasonable offer plus CONUS shipping.  It's going to Mid-Ohio if it doesn't sell before.

Thanks all.

Good Ridin'
slmjim & Z1BEBE
A biker looks at your engine and chrome.
A Rider looks at your odometer and tags.

1972 Z1 x2
1974 Z1-A x2
1975 Z1-B x2
1993 CB 750 Nighthawk x2
2009 ST1300A

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Last edit: by Wookie58.

Help ID 4/2 exhause, please. 18 Mar 2024 17:21 #896581

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1-4 & 3-4 center to center distance is 3.25" on the 650/750.  1-4 center to center distance is 290mm.

I wonder if those pipes are for these bigger bikes?

I have a NOS Supertrap header, with two different mufflers (canister and megaphone).  Thing is, though, I'm quite a picky type, and I don't like headers that hang low under the sump, like these pipes.  I suppose I need to just sell them, because I'm not going to use them.  If I could find a set of headers, maybe these, that tuck tight under the engine, I'd get on the custom exhaust path again.
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Help ID 4/2 exhause, please. 18 Mar 2024 21:27 #896588

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I just built a similar 4 into 2 for a Z1 engine in a 650 frame.

1 to 4 (2 to 3) C-C is 3-3/4" on a Z1 head, so for sure they are built for a small engine bike. The crossover pipe looks to be quite large.

Outer ports on a 650/750 are 3-1/4" C-C, inner ports are 5" C-C. I doubt they are for 550, I believe 550 has different port spacing than 650/750 as the heads on those are quite narrow.

 
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Last edit: by Injected. Reason: info

Help ID 4/2 exhause, please. 19 Mar 2024 04:56 #896593

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We didn't list 2-3 and 1-4 spacing because the crossover pipe's slip joint makes those dimensions somewhat variable.

Could someone please respond with the exhaust port OD of a 550 head?  Looking for the OD of where the exhaust gasket is inserted, not the port itself.  Might help by process of elimination if the collars on this pipe are too large for a 550.

Thanks for the responses everyone!

Good Ridin'
slmjim & Z1BEBE
A biker looks at your engine and chrome.
A Rider looks at your odometer and tags.

1972 Z1 x2
1974 Z1-A x2
1975 Z1-B x2
1993 CB 750 Nighthawk x2
2009 ST1300A

www.kawasaki-z-classik.com
An enthusiast's forum focused exclusively
on all things Z1, Z2 and KZ900.

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Help ID 4/2 exhause, please. 19 Mar 2024 10:14 #896621

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I don't have a 550 head, but the exhaust port ID on a 650 is 1.50" and a Z1 is 1.62" diameter.

Looking at those pictures the sleeves where they attach to the exhaust ports are huge compared to the down pipe size - quite odd.

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Help ID 4/2 exhause, please. 19 Mar 2024 18:46 #896651

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My Supertrapp header has 39.5mm OD flanges where they go into the head.  What size are these?

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Help ID 4/2 exhause, please. 20 Mar 2024 14:11 #896673

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The OD of the retaining collars is nominal 40mm. 

The headpipes taper to ~30mm ID about 1 1/2 inch in from the inlet.

Good Ridin'
slmjim & Z1BEBE
A biker looks at your engine and chrome.
A Rider looks at your odometer and tags.

1972 Z1 x2
1974 Z1-A x2
1975 Z1-B x2
1993 CB 750 Nighthawk x2
2009 ST1300A

www.kawasaki-z-classik.com
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Help ID 4/2 exhause, please. 20 Mar 2024 14:22 #896675

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So, must be a 650/750 header.  

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Help ID 4/2 exhause, please. 20 Mar 2024 14:29 #896676

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There is a gasket on Amazon which is "supposed to be" a replacement for the 550 gasket 11009-1866 which is 39mm OD

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Help ID 4/2 exhause, please. 20 Mar 2024 18:55 #896685

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" Curiouser and curiouser! "
--- Alice --- (in Wonderland)

Good Ridin'
slmjim & Z1BEBE
A biker looks at your engine and chrome.
A Rider looks at your odometer and tags.

1972 Z1 x2
1974 Z1-A x2
1975 Z1-B x2
1993 CB 750 Nighthawk x2
2009 ST1300A

www.kawasaki-z-classik.com
An enthusiast's forum focused exclusively
on all things Z1, Z2 and KZ900.

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Help ID 4/2 exhause, please. 21 Mar 2024 17:49 #896718

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I've been meaning to pull the ancient 4-into-1 off the '81 GPz550. Let me see if that can happen this weekend; if so, I can get some measurements.
1979 KZ400 Gifted to a couple of nephews
1967 Yamaha YCS1 Bonanza
1980 KZ440B
1981 Yamaha XT250H
1981 KZ440 LTD project bike
1981 GPz550
2013 Yamaha FZ6R
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Help ID 4/2 exhause, please. 21 Mar 2024 18:41 #896722

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MODS - just realized that slmjim posted the wrong OD of the retaining collars in the OP as 50mm. Oops...

They are 40mm.

Please correct or, enable edit & we will do so early AM tomorrow.

Thx.

Good Ridin'
slmjim & Z1BEBE
A biker looks at your engine and chrome.
A Rider looks at your odometer and tags.

1972 Z1 x2
1974 Z1-A x2
1975 Z1-B x2
1993 CB 750 Nighthawk x2
2009 ST1300A

www.kawasaki-z-classik.com
An enthusiast's forum focused exclusively
on all things Z1, Z2 and KZ900.

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