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seat securing knob #739482
06/22/18 6:22 pm
06/22/18 6:22 pm
Joined: Jul 2017
Posts: 42
Hangtown, CA>
B
barncobob Offline OP
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barncobob  Offline OP
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B

Joined: Jul 2017
Posts: 42
Hangtown, CA>
74 850.....the seat securing knob has 2 small holes at the base drilled at an angle,,is there a clip or something missing to keep it from vibrating off? purpose of holes?

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Re: seat securing knob [Re: barncobob] #739493
06/22/18 7:09 pm
06/22/18 7:09 pm
Joined: Dec 2004
Posts: 9,805
Scotland
kommando Offline
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kommando  Offline
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Joined: Dec 2004
Posts: 9,805
Scotland
Its for a roll pin so they do not fall off if the loosen off, not 100% successful even with the roll pin.

Re: seat securing knob [Re: barncobob] #739500
06/22/18 8:21 pm
06/22/18 8:21 pm
Joined: Jul 2017
Posts: 42
Hangtown, CA>
B
barncobob Offline OP
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barncobob  Offline OP
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Joined: Jul 2017
Posts: 42
Hangtown, CA>
perhaps a bit of silicone,permatex blue, just a dab?

Re: seat securing knob [Re: barncobob] #739501
06/22/18 8:27 pm
06/22/18 8:27 pm
Joined: Dec 2004
Posts: 9,805
Scotland
kommando Offline
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Joined: Dec 2004
Posts: 9,805
Scotland
No use, the roll pin just bends and allows the flange through.

Re: seat securing knob [Re: barncobob] #739508
06/22/18 9:12 pm
06/22/18 9:12 pm
Joined: Sep 2004
Posts: 959
Farnham, Surrey, UK
gunner Offline
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gunner  Offline
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Farnham, Surrey, UK
Interesting, I have recently discovered the same holes on my 1973 Combat Commando seat knobs which is now on the road after 18 months of restoration. Both of the knobs on my bike had split pins fitted although they didn't seem to engage very well with the bolt flange.

I haven't ridden enough miles yet to experience the knobs loosening, but is there a better way to stop them undoing?


1968 A65 Firebird
1967 B44 Shooting Star
1972 Norton Commando
Re: seat securing knob [Re: barncobob] #739511
06/22/18 9:33 pm
06/22/18 9:33 pm
Joined: Aug 2001
Posts: 1,295
Hamilton, Mass. USA
D
Dave Comeau Offline

Crew Chief
Dave Comeau  Offline

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Joined: Aug 2001
Posts: 1,295
Hamilton, Mass. USA
The knob is supposed to be:
1. screwed on past the bulge on the end of the threads.
2 Then the roll pin gets pushed on/in.
3 With normal use the seat knob never comes off the screw...the seat can be removed and even run loose and the knob in theory won't "fall" off.
4. People wreck the roll pin AND the seat screw retaining bulge by screwing the seat knob all the way off.
4a, now a new roll pin is much less effective. Seat knob falls off on to road unless checked for tightness.
5. Seat knob being loose is an operator error, knob falling off....see#4 and 4a


dynodave
BSA 3 1961-1963
Ducati 3 1992-2002
Norton many 1951-1975
87 Serv-Equip 100HP MC brake dynamometer,
Re: seat securing knob [Re: gunner] #739518
06/22/18 10:02 pm
06/22/18 10:02 pm
Joined: Mar 2006
Posts: 3,895
Norfolk, UK
L.A.B. Online content
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L.A.B.  Online Content
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Posts: 3,895
Norfolk, UK
Quote
I haven't ridden enough miles yet to experience the knobs loosening, but is there a better way to stop them undoing?


The roll pins don't prevent the knobs loosening, only from falling off if they loosen or when the rider forgets to retighten them after removing the seat to check the oil tank level etc. so the knobs get used frequently, however, the pins won't prevent the knobs from being wrenched off by a ham-fisted owner.






Last edited by L.A.B.; 06/23/18 10:53 am.
Re: seat securing knob [Re: gunner] #739557
06/23/18 6:58 am
06/23/18 6:58 am
Joined: Jun 2002
Posts: 10,262
Scotland
S
Stuart Offline
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Stuart  Offline
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S

Joined: Jun 2002
Posts: 10,262
Scotland
Hi,

Originally Posted by gunner
same holes on my 1973 Combat Commando seat knobs
knobs on my bike had split pins fitted although they didn't seem to engage very well with the bolt flange.
better way to stop them undoing?

Reusable R-pins?

[Linked Image]

Regards,

Re: seat securing knob [Re: barncobob] #739561
06/23/18 8:05 am
06/23/18 8:05 am
Joined: Sep 2004
Posts: 959
Farnham, Surrey, UK
gunner Offline
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gunner  Offline
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Joined: Sep 2004
Posts: 959
Farnham, Surrey, UK
Oh I see now, I had thought the roll pins were to prevent undoing but now see that they are to stop them falling off completely.

R-pins sound good so might try.


1968 A65 Firebird
1967 B44 Shooting Star
1972 Norton Commando
Re: seat securing knob [Re: barncobob] #740266
06/29/18 8:43 pm
06/29/18 8:43 pm
Joined: May 2007
Posts: 10,810
Pennsyltuckey
ricochetrider Offline

Moto Mojo
ricochetrider  Offline

Moto Mojo

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Posts: 10,810
Pennsyltuckey
Hmmm. I've not seen the pins, never used them, and never once had my seat's knobs even loosen a little bit.


"It is no measure of health, to be well adjusted to a profoundly sick society."

Re: seat securing knob [Re: barncobob] #740313
06/30/18 2:16 pm
06/30/18 2:16 pm
Joined: Mar 2006
Posts: 1,441
Magnolia, TX
htown Online content
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htown  Online Content
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Posts: 1,441
Magnolia, TX
I fit a stainless split pin (cotter pin) in them. Just long enough to be bent over on the ends. They will not fall out. Usually the hole has to be drilled somewhat larger.


1978 Bonneville T140E
1974 Trident
1970 BSA Thunderbolt
1971 Norton Commando
1972 Norton Commando
1973 Norton Commando
1974 Norton Commando
2004 XL 1200R Sportster

Everything will be alright in the end. If its not alright, its not the end.

Moderated by  Dave Comeau 

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