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 Exhaust info

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karlm

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Number of posts : 16
Age : 46
Localisation : Wales
Registration date : 2012-01-27

PostSubject: Exhaust info   Sun Jan 29, 2012 4:51 am

Hello to all, I am a long time Bantam owner (amongst other bikes) and am currently trying to restore a 125 (1955). As it has already deviated so far from production I am going to try and get a little extra out of the engine. One of the first items I am working on is a new exhaust incorporating expansion chamber. I will be fabricating one but would also like to have a fall back option of a manufactured unit. Does anybody have any information regarding a suitable donor unit, I was imagining some sort of jap 125 system. All help would be gratefully received.
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karlm

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Number of posts : 16
Age : 46
Localisation : Wales
Registration date : 2012-01-27

PostSubject: Re: Exhaust info   Sun Jan 29, 2012 4:54 am

I am looking for best power increase rather than a broad band.
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johnSbantam

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Number of posts : 254
Localisation : New Zealand
Registration date : 2006-12-01

PostSubject: Better exhaust   Sun Jan 29, 2012 6:21 pm

A D14 header pipe (with barrel port adaptor) and a Suzuki GT250 X7 RH silencer works quite well
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Derek

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Number of posts : 1065
Age : 56
Localisation : worcestershire
Registration date : 2007-06-15

PostSubject: Re: Exhaust info   Mon Jan 30, 2012 7:23 am

i will post an old print that george todd did on porting and pipe good to 7500 yo 8000 rpm drawing he sold to many

great info

but a little out of date for current racing but a big improvment with the correct exhaust port profiles.

regds
Derek
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karlm

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Number of posts : 16
Age : 46
Localisation : Wales
Registration date : 2012-01-27

PostSubject: Re: Exhaust info   Fri Feb 03, 2012 8:12 am

Many thanks to both of you for the help.
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