Seamless vs Seamed Peashooters

Eric Bauer · Aug 22, 2020

Hi all - looking to replace the silencers on my ‘73 850 - just curious were original oem pea shooters seamed or unseamed? I see them both ways. Thank you

kerinorton · Aug 22, 2020

my July 71 750 was seamless.

possm · Aug 23, 2020

I purchased a "71 Roadster that had the original seamless mufflers but I believe that the 850's were seamed.

SteveC · Aug 23, 2020

I bought a 72 Fastback in 1975 and the pea shooters were seamless.
They used to make the Canary twitter noise at tick over and at the end of overrun.
I had to replace them quite soon after because they rusted through in the water catcher position. (Steel rotted at the rate of Banana peel in those days).
I could only afford pattern replacements at the time and they had the seams - always looked wrong.

I fitted new seamless AN peashooters to my current Interstate - they look and sound great....no canaries though.....?

joe czech · Aug 23, 2020

I believe my 74 Mk2 pea shooters are original - they are seamed.

Eric Bauer · Aug 23, 2020

SteveC said:
I bought a 72 Fastback in 1975 and the pea shooters were seamless.
They used to make the Canary twitter noise at tick over and at the end of overrun.
I had to replace them quite soon after because they rusted through in the water catcher position. (Steel rotted at the rate of Banana peel in those days).
I could only afford pattern replacements at the time and they had the seams - always looked wrong.

I fitted new seamless AN peashooters to my current Interstate - they look and sound great....no canaries though.....?

I do know the canary sounds! I’m not sure if mine are original but they make it. I like the seamless look though for sure! I was hoping the earlier ones were a little louder too

Eric Bauer · Aug 23, 2020

possm said:
I purchased a "71 Roadster that had the original seamless mufflers but I believe that the 850's were seamed.

Is yours very loud?

myron1950 · Aug 23, 2020

My 1974 829cc Roadster came with seamed peashooters. I believe they were original.
I replaced with seamless from Commando specialties. Look nice - sound good.

MichaelB · Aug 23, 2020

Had a 73 Mk 1 850 from new back in the day. They were seamed and had removable mutes.
No longer have the bike.

Eric Bauer · Aug 23, 2020

MichaelB said:
Had a 73 Mk 1 850 from new back in the day. They were seamed and had removable mutes.
No longer have the bike.

Thank you - I wonder if the move to seamed was just a cost thing?

kerinorton · Aug 23, 2020

The 750 is higher compression, so the same mufflers sound louder. [ sound better too ]

SteveA · Aug 24, 2020

SteveC said:
I bought a 72 Fastback in 1975 and the pea shooters were seamless.
They used to make the Canary twitter noise at tick over and at the end of overrun.
I had to replace them quite soon after because they rusted through in the water catcher position. (Steel rotted at the rate of Banana peel in those days).
I could only afford pattern replacements at the time and they had the seams - always looked wrong.

I fitted new seamless AN peashooters to my current Interstate - they look and sound great....no canaries though.....?

loved the twitter on my '70, 750 Fastback, I always thought it was the fluted baffle that did it!

Bernhard · Aug 24, 2020

SteveA said:
loved the twitter on my '70, 750 Fastback, I always thought it was the fluted baffle that did it!

A few more flutes inside it and you have a petrol powdered organ!

xbacksideslider · Aug 25, 2020

Consider the internals too, - louvers vs perforated or other, inside diameter too.

Eric Bauer · Sep 3, 2020

I ended up picking up some non-fluted 1972 pipes. I prefer the look and they sound great - lots of "twittering" out of the baffles! They sound and look great. Thanks for all your help

Seamless vs Seamed Peashooters

Eric Bauer

kerinorton

possm

SteveC

joe czech

Eric Bauer

Eric Bauer

myron1950

MichaelB

"Sons of Arthritus"

Eric Bauer

kerinorton

SteveA

Bernhard

xbacksideslider

Eric Bauer

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