B25SS exhaust pipe

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JerryT
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B25SS exhaust pipe

Post by JerryT » Fri Aug 28, 2020 2:17 pm

Further to my B25SS covid project thread.
I bought a pattern exhaust pipe from a well known Midland supplier but when I fitted it I found that there was no clearance for the points cables/grommet. As a temp fix I relocated the cables through the face of the points cover so that I could get the machine up and running. When I contacted the supplier I was given fairly short shrift and told that the std pipe sits fairly close to the engine casing - (I had 35 thou clearance) They stated that their parts are made on a jig and any issues must be down to my barrel perhaps having been shortened at some time!!
Anyway after a couple of hours carefully tweaking and bending I finally have room to fit the grommet.
Can any B25 owner tell me how much clearance that they have, or should be, at this point.
Anyone else had a similar problem?
Thanks
Jerry
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Re: B25SS exhaust pipe

Post by BasilF » Fri Aug 28, 2020 3:32 pm

I had the same problem with the b50 pipe I recently bought. Tightening the front bend would have stopped it fitting through the frame at the back so I cut about 15mm out of the vertical part of the front bend and then welded it back together. To be fair, it is a bastard of a pipe to make compared with a typical low level pipe.

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Re: B25SS exhaust pipe

Post by BasilF » Fri Aug 28, 2020 3:55 pm

IMG_20200826_174856~2.jpg
Here is a photo. Cut and shut was half way round the front bend.

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Re: B25SS exhaust pipe

Post by Jeff K » Fri Aug 28, 2020 4:10 pm

As we say here in the USA, I am calling Bull Sh*T on that sellers answer. I have a 1971 Triumph Trail Blazer that is still original and untouched! and here are the photos of it for you. The original clearance is not in the thousands, it is closer to 3/4".
This is just the way that the bike came from the factory. Show him the photos and tell him to go back to the drawing board. I would not want that hot pipe that close to my engine!
Jeff
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Momus
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Re: B25SS exhaust pipe

Post by Momus » Fri Aug 28, 2020 6:18 pm

I'd agree with Jeff K and sympathise with the purchaser.

Who ever is fabricating those pipes needs to invest in a 1/2" or more smaller center line radius tooling.

Very easy pipe to make; would be good if they were made from 409 or 304 stainless or even titanium.
If you love it, lube it.

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Re: B25SS exhaust pipe

Post by Jeff K » Fri Aug 28, 2020 7:24 pm

Sad when you think about it. The factory was able to manufacture these 50 years ago on what was old equipment back then and they fit and worked. And here we are one half a century later will all of our massive advancements in computers, scanning, CNC, manufacturing, technology etc and the "new" pipe does not fit?
Jeff

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Re: B25SS exhaust pipe

Post by Jeff K » Fri Aug 28, 2020 7:27 pm

LOL! I just reread the original posting and the poor excuse was given that perhaps the barrel was shortened?? --- 3/4" ?? :roll: :roll:
Jeff

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Re: B25SS exhaust pipe

Post by BSA_WM20 » Sat Aug 29, 2020 11:40 am

Momus wrote:
Fri Aug 28, 2020 6:18 pm
I'd agree with Jeff K and sympathise with the purchaser.

Who ever is fabricating those pipes needs to invest in a 1/2" or more smaller center line radius tooling.

Very easy pipe to make; would be good if they were made from 409 or 304 stainless or even titanium.
Barry at Overlander makes all his pipes in stainless and has done so for near 40 years.
He also makes them in a single bend so the sweeping 3 dimensional curves are just that
Most other suppliers just weld a series of flat bends together which is the prime reason why they don't fit
Bike Beesa
Trevor

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Re: B25SS exhaust pipe

Post by Jeff K » Sun Aug 30, 2020 1:16 am

I just checked his web page and it looks like he makes the 71 mufflers.
"B25/50 Pressed muffler $310 ea"

https://dropbears.com/overlander/classic.htm

Dropbears? Aren't Dropbears the man eating, killer cousin to the timid Koala? I seem to recall that they only attack after their victim has consumed many pints of the local brew, :mrgreen:
Jeff

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Re: B25SS exhaust pipe

Post by BSA_WM20 » Wed Sep 02, 2020 1:18 pm

HE makes custom pipes as well.
Bike Beesa
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Re: B25SS exhaust pipe

Post by JB » Thu Oct 15, 2020 10:57 pm

If anyone here is struggling with the fit of a poor pattern B25 OIF exhaust pipe there is, from what I can tell, a genuine BSA one for sale here https://www.ebay.co.uk/itm/Triumph-T25- ... Swm39fRnVa From experience the original BSA pipes always fit way better than a copy of it.

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Re: B25SS exhaust pipe

Post by Johnq1 » Fri Oct 16, 2020 7:11 am

I can recommend Ben at Raysons exhausts, he will sand bend a pipe to your size and requirements
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