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#804419 04/07/20 5:22 pm
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Hi, I would be grateful if someone has the valve spring lengths for a 500cc DBD Clubman - road use.

The ones that I have received from reputable supplier measure as follows unfortunately due to Coronavirus they are now closed.
I ask this as there are different lengths from those in various manuals.

Outer = 1.750”
Inner = 1.725”

Many thanks
Mike.


Mike.



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Hi 68 Triton,
I have a workshop book from Terry Springs and it gives this info.
Outer 65-2494 wire dia.0.148" od 1.256" free length 1 11/16" total coils 5 3/4 full r/h wound
Inner 65-2495 wire dia 0.116" od .940" free length 1 50" total coils 6 l/h wound
This is from a book used in the workshop to check production.
Pat A

terry 451/488 the same springs for c15/b40/b44

Last edited by mr.moto; 04/07/20 7:33 pm. Reason: further info.
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In the past I've always been more interested in the fitted length - enough not to be coil-bound at full lift, but little enough to allow some clearance from the piston by a small margin..with luck, that'll also give the designed poundages at lift and rest.


No generalisation is wholly true, not even this one.
Oliver Wendell Holmes
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From the BSA Gold Star Instruction Manual:
Valve Springs (outer): free length 1.670 inches
fitted length 1.312 inches
(inner): free length 1.500 inches
fitted length 1.218 inches
Hope this helps

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Hi Guys, Thanks for the replies.

I wanted to keep the specs, drifting away from these normally means trouble unless you 100% know what you are doing!

Are the original springs 'variable rate' ? There is so much on the market, just don't know of a reliable source.

Mike


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Hi Mike,

Have you tried Phil Pearson? He is local to you, and is easily the best resource in the UK bsagoldstar.co.uk

Give him a call and he will tell you what you need to know.

A lot of guys on this site use Mike Reilly in Brisbane, Australia, who also has a lot of parts. mikesclassiccyclespares.com/

Good luck.

Last edited by NYBSAGUY; 04/08/20 3:51 pm.
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Talk to Phil P. I had a couple of sets of recently manufactured 'good' sets of springs when I turned up at his door to have him build my DBD engine. He used his own version, known what they were and how they were made. They weren't expensive - I took his advice and used his springs.

I'm sure Phil will supply springs and advice on preferred fitted lengths.


No generalisation is wholly true, not even this one.
Oliver Wendell Holmes
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H Kerry, Yes, he done my cylinder head for me 6 years back. 20k miles and still good never had the the head off.

Cheers.


Mike.



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Thanks.


Mike.




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