Z1 4-4

[needaz1100r]

I have a set of 4-4 exhausts taken off a Z1 with no stamps.

They are in poor condition, but I don't know if they are repro or original. They were on a bike that hadn't been restored or touched for many years so I suspect too old to be repros given their condition.

I'm guessing there will be some easy to spot details that will tell me.

Any pointers gratefully received, thank you.

[Andrew_s]

I have a set of 4-4 exhausts taken off a Z1 with no stamps.

They are in poor condition, but I don't know if they are repro or original. They were on a bike that hadn't been restored or touched for many years so I suspect too old to be repros given their condition.

I'm guessing there will be some easy to spot details that will tell me.

Any pointers gratefully received, thank you.

72-73 Z1s had a 'peashooter' coming of the baffle (the one in the photo is not an original but made to look right) - I don't think the later Z1A or B had them?

50055140168_83d3035c20_c.jpg (117.36 KiB) Viewed 3553 times

[z2.john]

Any pointers gratefully received, thank you.

Does the joint where downpipe meets muffler have a 'band' to hide the weld? If not, is the weld chrome plated or painted with silver?

[Ultim8pc]

I'd say the main clue is the quality of the external welded seam. It's pretty scabby on the OEM ones and nice and neat on the repros. I was also thinking about the peat shooter baffles, but not sure if theses featured on the Z1a/b..

[needaz1100r]

Any pointers gratefully received, thank you.

Does the joint where downpipe meets muffler have a 'band' to hide the weld? If not, is the weld chrome plated or painted with silver?

Band is chrome plated.

[z2.john]

Judging by the one picture, I'd say they are original. What is the date of manufacture for this Z1?

[needaz1100r]

Judging by the one picture, I'd say they are original. What is the date of manufacture for this Z1?

They were on a very early Z1-A. It came from the states and the rest ofvit seems pretty unmolested, original paint, toolkit etc.

I thought Z1-As had stamped 74 pipes, but of course a set of 73 pipes could have been fitted in the last 45 years before repros were available.

[ADRIAN H]

I thought Z1A and Z1B’s had a cover strip over the weld - though I could easily be wrong.

[needaz1100r]

I thought Z1A and Z1B’s had a cover strip over the weld - though I could easily be wrong.

I researched that with Dave from Cybike and were unsure for the Z1-A, depends what you read.

Also, Z1-B have stamping, again not sure about the A.

My uncertainty with these is they just seem too old to be Repros and were on a bike that would seem to have been untouched since before repros were available.

[needaz1100r]

A few more pics. Trying to decide whether it's worth repairing them, just cleaning them or selling as is.

Thanks for everyone's input

[Ultim8pc]

Worth repairing as they would be worth around £3k in an as new condition. (repaired and rechromed).

[needaz1100r]

Worth repairing as they would be worth around £3k in an as new condition. (repaired and rechromed).

Cool, I'll get me welding goggles on.