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SU Carburettor Suction Chamber Piston Spring Identification
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Author:  1018cc [ Thu Feb 11, 2016 12:20 pm ]
Post subject:  SU Carburettor Suction Chamber Piston Spring Identification

After some investigation today - I have found out I have blue springs in my SUs, not red as I originally assumed (the springs have never had paint on them).

I had an opportunity to sit side by side my (unknown) springs, known red springs and known yellow springs:

Image

Wire diameter: Blue ~0.7mm
Image
Wire diameter: Red ~0.9mm
Image
Wire diameter: Yellow ~1.0mm
Image

gtogreen1969 wrote:
Can you add this to it as well?

Light Blue 2.5OZ @ 2.625" AUC4587
Red 4.5OZ @ 2.635" AUC4387
Yellow 8OZ @ 2.750" AUC1167
Green 12OZ @ 3.000" AUC1170


Hopefully this will help some of you out.

Author:  Mick [ Thu Feb 11, 2016 6:05 pm ]
Post subject:  Re: SU Carburettor Suction Chamber Piston Spring Identificat

Thanks Nick, I might drop this in the How To if I may.

Author:  1018cc [ Thu Feb 11, 2016 6:22 pm ]
Post subject:  Re: SU Carburettor Suction Chamber Piston Spring Identificat

Go for it mate. I thought I'd post it up as I'd never found anything similar on the net (which didn't help me in my situation as the paint from my springs was long gone!).

Author:  Morris 1100 [ Thu Feb 11, 2016 6:30 pm ]
Post subject:  Re: SU Carburettor Suction Chamber Piston Spring Identificat

Good work.

Author:  gtogreen1969 [ Thu Feb 11, 2016 7:46 pm ]
Post subject:  Re: SU Carburettor Suction Chamber Piston Spring Identificat

Can you add this to it as well?

Light Blue 2.5OZ @ 2.625" AUC4587
Red 4.5OZ @ 2.635" AUC4387
Yellow 8OZ @ 2.750" AUC1167
Green 12OZ @ 3.000" AUC1170

Author:  1018cc [ Thu Feb 11, 2016 7:49 pm ]
Post subject:  Re: SU Carburettor Suction Chamber Piston Spring Identificat

gtogreen1969 wrote:
Can you add this to it as well?

Light Blue 2.5OZ @ 2.625" AUC4587
Red 4.5OZ @ 2.635" AUC4387
Yellow 8OZ @ 2.750" AUC1167
Green 12OZ @ 3.000" AUC1170


Done.

Author:  Morbo28 [ Thu Feb 11, 2016 9:01 pm ]
Post subject:  Re: SU Carburettor Suction Chamber Piston Spring Identificat

Very handy thanks

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