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650 SS

Norton Models (not Commando or P11)

650 SS

Postby Brooking 850 » Wed Aug 09, 2017 2:20 am

Hi to all forum members, hope you can help me with a few issues .
I have a race bike set up with a 650 SS motor and a slimline frame.
The engine numbers are (as I can make out ) 18 SS 406375 .
There is a marking after the ..... 75 numerals that is hard to make out, it could a R and also a slash before the 4 which could be a 1
With the frame, there is no numbers, I thought the featherbed frames had a number stamped on the rear vertical gusset on the back loop left hand side.
Also this frame has an upward curve on the bottom tube instead of being straight and parallel to the ground.
It comes with two spare heads, one alloy , one cast.
The motor in the bike has an alloy head, twin carbs, runs on alcohol h has a distributor and runs well. 6V coils, Positive ground, total loss.
The difference in the two alloy heads, the one in the bike has the bolt holes horizontal for the inlet manifolds, (as per Commando )the spare head has them in the vertical on each port.
Any ideas please ?
Regards Mike
Last edited by Brooking 850 on Mon Aug 14, 2017 6:51 pm, edited 1 time in total.
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Re: 650 SS

Postby robs ss » Wed Aug 09, 2017 3:58 am

Mike
The number doesn't sound like anything 650SSish
I think in late '61 they started at around 101000 and finished in '67 at around 120000 so your number doesn't come even close to fitting (it's even after the last Commando number!) at 406375
18 of course being the designation for all 650s
You're correct about the location of the frame number
Your description of the frame curve is not clear o me - maybe a pic would be better?
Cheers
Rob
1962 Norton ES2
1964 Norton 650SS
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Re: 650 SS

Postby bad_friday » Wed Aug 09, 2017 7:38 am

Brooking 850 wrote:…The difference in the two alloy heads, the one in the bike has the bolt holes horizontal for the inlet manifolds…

As far as I know, all 650SS-heads are down draught with the horizontal bolt pattern. Have a look here: http://atlanticgreen.com/nhth.htm

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Re: 650 SS

Postby BritBikeBoy » Wed Aug 09, 2017 3:35 pm

Alloy head with the vertical intake manifold fastener holes/studs sounds like a standard, non-SS head.
Yes, frame number should be located on the left hand swing arm gusset plate of the main frame loop, just above the swing arm pivot bolt. Without seeing photos, the non-parallel bottom main frame loop rail is most definitely non-standard.

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Re: 650 SS

Postby Brooking 850 » Thu Aug 10, 2017 1:12 am

Thanks guys, seem to have the numbers sorted.
I went and bought a new set of magnifying glasses and behold the right numbers.
The initial marks that I saw when I posted were infact 2 x 1's close together that made them look like a slanted dash.
Also what i thought was a R as a suffix is a P as the Kiwi police force used to stamp their engines with a P to denote they were police bike issue. The extra marks that make it look like a R are the indents from the end of the letter punch as it is on a curved surface.
18 SS 11406375/P
The frame maybe a repaired slimline hence the curved bottom rails.
Regards Mike
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Re: 650 SS

Postby Brooking 850 » Thu Aug 10, 2017 1:22 am

Also I am after a 650 SS parts book and workshop manual
Any .pdf files out there?
Regards Mike
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Re: 650 SS

Postby L.A.B. » Thu Aug 10, 2017 1:24 am

Brooking 850 wrote:Also what i thought was a R as a suffix is a P as the Kiwi police force used to stamp their engines with a P to denote they were police bike issue.18 SS 11406375/P



/P usually denotes a 'Plumstead' (AMC) built engine.

http://www.nortonownersclub.org/noc-cha ... #647433943
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Re: 650 SS

Postby BritBikeBoy » Thu Aug 10, 2017 2:35 am

I have heard the rumour of the /P engine number suffix meaning police spec, but I'm with LAB /P = Plumstead.

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Re: 650 SS

Postby Brooking 850 » Thu Aug 10, 2017 4:04 am

Thanks guys, got it Les.
The P was also on the Triumph and BSA's that were police issue.
We used to try and get our hands on the ex police bikes as they had been better looked after and maintained by the time they were sold off or phased out as they went to Jap and European bikes.
Regards Mike
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Re: 650 SS

Postby Brooking 850 » Thu Aug 10, 2017 4:12 am

Heres what was used in the past as police bikes.
Also present bikes
Image
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Re: 650 SS

Postby L.A.B. » Thu Aug 10, 2017 4:23 am

Brooking 850 wrote:The P was also on the Triumph and BSA's that were police issue.


Yes, although for Triumphs the P was normally included in the model code, for example, 'TR6P'.
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Re: 650 SS

Postby Brooking 850 » Mon Aug 14, 2017 2:06 am

Hi Les, so what year do you think this motor will be from?
Mid '60"s?
Regards Mike
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Re: 650 SS

Postby Bernhard » Mon Aug 14, 2017 2:52 am

Brooking 850 wrote:Heres what was used in the past as police bikes.
Also present bikes
Image



This is not a full list, there were in the 1960s the old 650 Triumph Thunderbirds , 750 Atlas, even the Velocette LE “noddy”

https://www.bing.com/images/search?q=ve ... ORM=IQFRBA
I'm sure others can add to this list.

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Re: 650 SS

Postby L.A.B. » Mon Aug 14, 2017 3:26 am

Brooking 850 wrote:Hi Les, so what year do you think this motor will be from?


"11406375" seems to have two digits too many?

http://www.bmh.com.au/norton/index.php?id=modelnum
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Re: 650 SS

Postby Brooking 850 » Mon Aug 14, 2017 4:30 am

Bernard, that was just the list of bikes used in the New Zealand police force, not the UK or Europe, reason for such a short list.

Les , yes it seems so, but that whats stamped on there.
Unles they were blank cases and a PO stamped what he thought was correct.

can you post a pic of another set of SS numbers to see if the combination and placement is the same.
Thanks and regards Mike
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