Rocker springs v thrust washers

[cableguide]

Greetings fellow A folk.
In the process of re-building my 61 A7SS engine and was wondering if there is any noise benefit in replacing the rocker shaft springs with a set of bronze or steel thrust washers instead.
All ideas most appreciated
Cabe

[Greybeard]

Ask Musky. Sounds like fitting the rocker box becomes more difficult as the rockers don't stay put.

[BSA_54A10]

Yes.
A lot quieter with thrust washers
Down side is PIA to set up and you have to cut down hard washers to fit with around .002" running clearence.

[muskrat]

My main intention was to cut down on a little friction/stiction caused by the springs. Less clatter was a welcome byproduct. When fitting the rockerbox I slip rubber bands over the rockers and up and over the opposite side inspection cover stud to keep'em up. Once all fitted cut the bands.
Cheers

[Triton Thrasher]

I'm all for people having fun in the shed.

That's the main benefit of such a modification.

[Dean]

I'm tempted to try thrust washers if they'll quieten the top end.
Where would i find suitable washers?

[muskrat]

I used a collection of the original flat washers that sit between the spring and alloy.
Cheers

[Dean]

I used a collection of the original flat washers that sit between the spring and alloy.
Cheers

Thanks Muskrat

[BSA_54A10]

I had a box full of old bucket rocker shims when I did mine,
The OD was a bit big and a masionary drill with a reprofiled tip did the job of making the hole from a pilot cut with a diamone Dremel tip.

[cableguide]

Great info guys, reckon I may give it a go as Ive just found that TMS can supply the two sizes of thrust washer but like everything with these bikes best to think and tread carefully before messing something up.

[jachenbach]

When fitting the rockerbox I slip rubber bands over the rockers and up and over the opposite side inspection cover stud to keep'em up. Once all fitted cut the bands.
Cheers

Having several times seen the reference to rubber bands to hold the washers, I've wondered how that worked. Now that you've explained it seems obvious.

[Dean]

Great info guys, reckon I may give it a go as Ive just found that TMS can supply the two sizes of thrust washer but like everything with these bikes best to think and tread carefully before messing something up.

Good to know TMS stock them. I might make the 5 mile trip to get some then

[morris]

I'm tempted to try thrust washers if they'll quieten the top end.
Where would i find suitable washers?

https://www.onlinemetals.com/merchant.cfm?id=1217&step=2&top_cat=1175

You'll need
1 pack of 0.062 thick x 0.5"ID x 0.75"OD
1 pack of 0.032 thick x 0.5"ID x 0.75"OD
1 pack of 0.0015 thick x 0.5"ID x 0.75"OD