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B175 down pipe
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Terence7919
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April 25, 2020 - 6:59 pm
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Hi folks. Just coming to the end of long rebuild  fitted the silencer clears the kickstart. Even though down pipe has fitted it is hard against the frame down tube.  Not sure this is right?   Thanks terry 

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BASIL
Hamstreet,Ashford.
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April 25, 2020 - 7:21 pm
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Thats pretty normal I have had to put a dent in the downpipe before now to get it to fit!! Regards Basil.

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mikef
Chatham Kent
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April 25, 2020 - 7:53 pm
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Hi.
     This post made me think, I know that people have said that the clearance is pretty small, so I have just measured mine. I have 5.5mm clearance.
My bike is a D14/4 but think the B175 should be the same.
About the only thing I can think of to cause a problem in this area is a distorted front engine mount. I have seen the welds to the frame break at this point.
Just a thought.
           Mike.

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Mannanan
Leigh On Sea, Essex. Uk.
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April 26, 2020 - 12:24 pm
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Just measured mine on my B175 to be less than 3mm gap which is pretty tight. Mine has the original down pipe and silencer so guess it’s meant to be a close.

 

IMG_0583.JPG

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Terence7919
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May 3, 2020 - 7:43 pm
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Evening folks just went to final fit down pipe ,new copper gasket, tightened up ,gasket now flat  pipe is still very loose am I missing something?

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mikef
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May 3, 2020 - 8:08 pm
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Hi Terence.
      It seems like the threaded collar is not screwing down properly for some reason. Could be due to rusty threads or maybe an aftermarket collar and there is a problem with the threads. Probably a good idea to try screwing the collar on without the downpipe in place, you might get a better idea of what's going on.
Good luck.
        Mike.

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Terence7919
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May 3, 2020 - 8:50 pm
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Thanks mike I’ll take it apart and start again. Thanks again

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Peterg
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May 3, 2020 - 10:34 pm
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Mannanan said
Just measured mine on my B175 to be less than 3mm gap which is pretty tight. Mine has the original down pipe and silencer so guess it’s meant to be a close.

 

IMG_0583.JPG  

Note the genuine BSA pipe has a slight throw to the right to miss the frame. Pattern pipes tend to be straight. The bend can also be off, so when the silencer has been fitted, the mouth of the pipe isn't square to the port

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nickjaxe
Runcorn Cheshire UK
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May 3, 2020 - 11:10 pm
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Yes pattern pipe sometimes are not very accurate...with the pipe jamming on the frame, it maybe not flat at its face with the engine....

As Mikef says...try the color without the pipe...see if it goes on then...I had to fit 2 copper gaskets to my old pipe to get it snug.

Have a look at the flange on the pipe...make sure its not cracked with strain.

My Bantam video              https://www.you.....jpOFmzRZRI

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cocorico
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May 4, 2020 - 8:03 am
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As Nick says - a 'new' pipe may not be exactly as an OE one (as a lot of replacement parts aren't), so you have to take it easily and check each component. Fit of nut to manifold, pipe to manifold, pipe to nut, then all together. Even then, you may find a bit of misalignment when you get to the silencer. It's one of the joys of putting old motorbikes together.

1956 D3 running, lights to sort. 7 other bikes in the Barn. 1950 D1 engine now running.

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