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bsa bantam 175 cylinder exhaust port sizes

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purglaspete
L Plate Warrior



Joined: 24 Apr 2019
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PostPosted: 19:10 - 24 Apr 2019    Post subject: bsa bantam 175 cylinder exhaust port sizes Reply with quote
hello I am a newbie on here and I am wondering if there are any bsa bantam experts out there who might be able to help me , I have a bsa bantam 175 D14/4 engine and the exhaust outlet on the barrel is 1 3/8 size and when I sent off for a new exhaust pipe when the one that came it was 1 3/4" , so is the barrel on my bike from an earlier model or are there two different sizes of exhaust pipe for the D14/4 engines. any help would be greatly appreciated
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DJS
Nitrous Nuisance



Joined: 01 Dec 2012
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PostPosted: 10:53 - 25 Apr 2019    Post subject: Reply with quote
If you don’t get any joy on this forum have a look at www.bsabantamclub.com - the’ve got an excellent Bantam specific forum and the depth of knowledge is superb in my experience.
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Riejufixing
World Chat Champion



Joined: 24 Jun 2018
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PostPosted: 20:16 - 25 Apr 2019    Post subject: Re: bsa bantam 175 cylinder exhaust port sizes Reply with quote
purglaspete wrote:
are there two different sizes of exhaust pipe for the D14/4 engines


People refer to "big" and "small" bore pipes, so I guess so. The club, as above.
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steve the grease
Crazy Courier



Joined: 26 Jan 2018
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PostPosted: 22:29 - 25 Apr 2019    Post subject: Reply with quote
Apparently there is a scew in stub to mount the bigger pipe , it's to help increase bottom end power. A simple google search found that on the owners club listed above.
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purglaspete
L Plate Warrior



Joined: 24 Apr 2019
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PostPosted: 18:22 - 26 Apr 2019    Post subject: Reply with quote
thankyou for the information I shall tell my neighbour when I see him tomorrow , you people are a great help regards pete
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