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mjpowell

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Number of posts : 1074
Localisation : Lincoln England
Registration date : 2006-12-09

PostSubject: Re: frames    Wed Feb 29, 2012 12:27 am

Yes Ned its 001 with its original stand too.. excellent idea.. grab the handlebars
roll forward and the stand collaspes on itself.. copied it for 003 so it has the same
set up.
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john bass

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Number of posts : 1712
Age : 88
Localisation : Bensberg, Germany
Registration date : 2006-12-06

PostSubject: The Rake Angle...?   Wed Feb 29, 2012 3:47 am

I was going to ask, why all the reinforcing plate up at the steering head and Ned virtually answered the question...

The rake angle was changed? and it looks very much as if the front- down tube was replaced with new tube as the front engine plate welding does not look BSA factory standard and there are no holes (for footrest bolt) in that "New" tube -- Am I right?

Cheers!
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Ned

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Number of posts : 259
Localisation : Rayleigh Essex
Registration date : 2007-01-11

PostSubject: Re: frames    Wed Feb 29, 2012 6:38 am

I'm guessing the headstock gusset is to prevent a recurrence of the 002 frame malfunction Laughing
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mjpowell

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Number of posts : 1074
Localisation : Lincoln England
Registration date : 2006-12-09

PostSubject: Re: frames    Wed Feb 29, 2012 8:22 am

No John the frame was been de-lugged - all the bits not needed were removed.
The engine is mounted at a different angle to standard hence new front plates,
and an extra lug brazed on for the rear mounting plates. Headstock plates are
off a type used since before my time. Two is better than one apparently.
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adam p



Number of posts : 63
Localisation : fakenham,norfolk
Registration date : 2011-03-23

PostSubject: frames   Wed Feb 29, 2012 8:31 am

hi all, mike is there a jig to produce this type of frame or are they all individually built, is there any information/specs/dimensions that could be posted on the forum ? best regards adam.
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mjpowell

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Number of posts : 1074
Localisation : Lincoln England
Registration date : 2006-12-09

PostSubject: Re: frames    Wed Feb 29, 2012 10:05 am

Hi Adam i see you have been doing some frame mods on a trails bantam on
the Bsa Bantam Club F/B page.

All frames hand built but in a jig, this sets the headstock and swinging arm pivot.
The rest isn't jigged so very much hand built. There are drawings but in the interest
of bantam racing I don't think we want any more the same, and in view of Mick Potters
recent posts - perhaps things should be done differently. Read Mick Potters posts then
p me .. we'll talk.. Mike
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johnSbantam

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

PostSubject: Engine alignment   Wed Feb 29, 2012 5:01 pm

How is the engine angle changed ?
because the frame loop is at different angle, or engine at a different height ?

I had thought of lifting engine up 1/2 - 1" so gearbox sprocket more in line with swinging arm and rear wheel axle.
I have a lot of trouble with trials bike chain tension because of lack of alignment of engine etc
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Nick B

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Number of posts : 94
Localisation : Softy Southerner Bexhill on Sea
Registration date : 2008-02-14

PostSubject: Ex Pete Tibbitts rolling chassis.   Mon Mar 05, 2012 3:34 am

Hi all, Had to sneak it in to the cellar in bits. winter o/haul is going well a few new bearings, new paint etc.
Cheers for now Nick.
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