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#878282 04/21/22 6:26 pm
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Building the 68 tbolt head. New valve springs from Steadfast cycles. Springs appear to be just a tiny smidge larger od than standard and don't want to sit in the spring cup.
Is this a common occurrence? I can't imagine it would affect anything negatively to slightly bevel
the edge of the spring face to fit in the cup. But I'm not stoked on the idea...
Anybody have this experience?
Thanks!

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StephenM #878337 04/22/22 11:59 am
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Sounds exactly the same as the inner springs that SRM are suppplying now, they are a gnats smidge tighter than they should be, if you work at it enough you can get the cup and cap to sit and hold, but i was close to getting a die grinder to mine. I doubt you would do any harm adding a chamfer to the edge of the spring so it will sit on.

A better option would be to send them back and order ones from Ed V, his seem to be consistantly spot on and where I will be ordering my next set from. I have some Ed V springs from a little while ago, but found until recent the SRM ones were good, but without the shipping cost to the UK was the more viable option.
Cant find a link on his website, but contact him and he will be able to assist.


Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (now rebuilt)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)

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He is a sponsor of this forum at "E&V Engineering" found up in the list of sponsors.

Gordo


The roadside repairs make for the best post ride stories.
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I have been getting sets of springs for other Brit bikes that are slightly off. The inner springs don’t quite fit the retainers . What I have been doing is putting the retainer on top of the spring and squeezing with an arbor press or similar so that the spring snaps in place. It doesn’t take much. I too questioned this but I have received them this way from several suppliers.In my situation it was the spring ID that was small.

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Or try these, Terry's Valve Springs 451-531
ebay uk 185274642178
While part numbers changed, they are referenced
forward and backward in 1970 Master parts list.

StephenM #878431 04/23/22 10:46 pm
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Well, the outer springs just aren't going to work. Beveled the edge to help fit but the outer diameter of the spring is just too large, about 20-25 thou larger than the inner lip of the spring cup. The coil itself is thicker than stock and the spring itself sits about a 1/16 taller.
I don't know how to load pics on this forum from my phone otherwise I'd show pics of how they read with calipers.
Classic British spares has an article on their blog that addresses junk uk made springs and how they can cause coil bind and end your ride real quick (catastrophically)...
Looks like these are from that stock.
For reference they came from Steadfast cycles and are from MCA (Aston) ltd.
Made in England part number D405B.
Looks like I'm not getting the head together this weekend...

StephenM #878435 04/23/22 11:46 pm
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For a road bike, Triumph T140 springs are fine.
No need for fancy race springs and T140 ones are easily available.
Just don't buy Wassel ones.

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