BritBike Forum logo
BritBike Sponsor BritBike Sponsor BritBike Sponsor
BritBike Sponsor

BritBike Sponsor

BritBike Sponsor
BritBike Sponsor BritBike Sponsor BritBike Sponsor
The Bonneville Shop
Home | Sponsors, Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons, "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Member Spotlight
john toghill
john toghill
chatham kent UK
Posts: 380
Joined: August 2005
Show All Member Profiles 
Shout Box
Search eBay for motorcycle parts in following countries
Australia, Canada, France, Holland, Italy, United Kingdom, USA
Random Gallery photo
Who's Online Now
11 registered members (bsawood), 185 guests, and 376 spiders.
Key: Admin, Global Mod, Mod
Newest Members
John Rowley, Zoot, sal pisciotta, Shawn G, bemie
10528 Registered Users
Top Posters(30 Days)
franko 90
Lannis 85
NickL 66
Popular Topics(Views)
785,052 mail-order LSR
Forum Statistics
Forums34
Topics69,219
Posts674,257
Members10,528
Most Online3,995
Feb 13th, 2017
Like BritBike.com on Facebook

Previous Thread
Next Thread
Print Thread
Rating: 3
Amal Concentric Carb Insulating Spacer? #734388
05/07/18 1:13 pm
05/07/18 1:13 pm
Joined: Apr 2015
Posts: 49
Florida
B
BillD47 Offline OP
BritBike Forum member
BillD47  Offline OP
BritBike Forum member
B

Joined: Apr 2015
Posts: 49
Florida
I am putting "thin" insulating spacers between the carbs and head on my '65 Spitfire. Since these are hard spacers, should there be paper gaskets on both sides of each insulator?
Good day!

Support your #1 BSA Forum and our favorite sponsors

Check out BSA on e-bay: BSA Parts in UK, BSA Motorcycles in UK, BSA Parts in North America, BSA Motorcycles in North America

 
Re: Amal Concentric Carb Insulating Spacer? [Re: BillD47] #734418
05/07/18 7:08 pm
05/07/18 7:08 pm
Joined: Mar 2005
Posts: 10,270
Boston, Massachusetts
J
John Healy Offline
BritBike Forum member
John Healy  Offline
BritBike Forum member
J

Joined: Mar 2005
Posts: 10,270
Boston, Massachusetts
The factory used the "O" ring for a seal on the carburetor side and a paper gasket on the engine side.


Re: Amal Concentric Carb Insulating Spacer? [Re: BillD47] #734489
05/08/18 12:09 pm
05/08/18 12:09 pm
Joined: Apr 2015
Posts: 49
Florida
B
BillD47 Offline OP
BritBike Forum member
BillD47  Offline OP
BritBike Forum member
B

Joined: Apr 2015
Posts: 49
Florida
Thank you.

Re: Amal Concentric Carb Insulating Spacer? [Re: BillD47] #734506
05/08/18 3:16 pm
05/08/18 3:16 pm
Joined: Feb 2014
Posts: 1,235
Lancaster, California
C.B.S Offline

Parts Dealer
C.B.S  Offline

Parts Dealer

Joined: Feb 2014
Posts: 1,235
Lancaster, California
Curious to know... what size (thickness) spacers are you using?

Re: Amal Concentric Carb Insulating Spacer? [Re: C.B.S] #734628
05/09/18 2:41 pm
05/09/18 2:41 pm
Joined: Nov 2009
Posts: 284
UK
V
VicCyclone Offline
BritBike Forum member
VicCyclone  Offline
BritBike Forum member
V

Joined: Nov 2009
Posts: 284
UK
They are not really spacers, they are heat insulation washers. The originals were made from TUFNOL a hard laminated fabric/resin material made by the TUFNOL company who are still in business in their original factory in Wellhead Lane Perry Barr Birmingham. More or less directly opposite the site of the AMAL factory in Holford Road. TUFNOL is a similar material to Paxolin which was used to make Lucas magneto gears


VicCyclone

1965 A50 Cyclone Clubman
1966 Victor GP
1967 Victor Special
1968 Victor Special
1968 A65L

2009 HD FXDC
Re: Amal Concentric Carb Insulating Spacer? [Re: C.B.S] #734654
05/09/18 6:49 pm
05/09/18 6:49 pm
Joined: May 2013
Posts: 5,224
West Yorkshire
Allan Gill Offline

BritBike Forum member
Allan Gill  Offline

BritBike Forum member

Joined: May 2013
Posts: 5,224
West Yorkshire
Originally Posted by C.B.S
Curious to know... what size (thickness) spacers are you using?



Same here. Many on the market are too thin, from memory the originals were about 3/16 thick, Ive seen some
About 1/8 which is too thin. That said, I wouldn’t use anything less than 10mm spacers on mine, on a hot day in heavy traffic anything much thinner causes running problems from the fuel boiling in the bowls.


beerchug
Re: Amal Concentric Carb Insulating Spacer? [Re: BillD47] #734670
05/09/18 10:08 pm
05/09/18 10:08 pm
Joined: Apr 2015
Posts: 49
Florida
B
BillD47 Offline OP
BritBike Forum member
BillD47  Offline OP
BritBike Forum member
B

Joined: Apr 2015
Posts: 49
Florida
I have purchased the thin insulators, but after your comments I may be buying a thick set as well. Thanks again for the insight.

Re: Amal Concentric Carb Insulating Spacer? [Re: BillD47] #734695
05/10/18 4:24 am
05/10/18 4:24 am
Joined: Apr 2007
Posts: 840
Brisbane, Australia
BrizzoBrit Offline

Life member
BrizzoBrit  Offline

Life member

Joined: Apr 2007
Posts: 840
Brisbane, Australia
Yes, I'd reiterate what Alan says. I had issues with the fuel vaporising in the float bowls here in Brisbane summers. I now use 3/4" thick ones. Air filters only just squeeze in with concentrics. Might not work for monoblocs.

Cheers
ray

Last edited by BrizzoBrit; 05/12/18 12:28 am. Reason: use of correct word

BSA 1969 A65F
BSA 1966 A65H
Triumph 1968 T120
Kawasaki A1R
& too many projects!
Re: Amal Concentric Carb Insulating Spacer? [Re: BillD47] #734724
05/10/18 12:03 pm
05/10/18 12:03 pm
Joined: May 2004
Posts: 3,910
Sydney Australia
B
BSA_WM20 Offline
BritBike Forum member
BSA_WM20  Offline
BritBike Forum member
B

Joined: May 2004
Posts: 3,910
Sydney Australia
Apparently the same material is used for heavy industrial fuse boxes.
So find some one who makes them and see if you can get off cuts.


Bike Beesa
Trevor
Re: Amal Concentric Carb Insulating Spacer? [Re: BillD47] #734759
05/10/18 5:35 pm
05/10/18 5:35 pm
Joined: Jun 2002
Posts: 10,262
Scotland
S
Stuart Offline
BritBike Forum member
Stuart  Offline
BritBike Forum member
S

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

Originally Posted by BSA_WM20
Apparently the same material is used for heavy industrial fuse boxes.find some one who makes them and see if you can get off cuts.

Originally Posted by BillD47
I have purchased the thin insulators,
may be buying a thick set as well.

Surrey Cycles certainly used to have them in several thicknesses - worth an e-mail to check? https://surreycycles.com/contact-us/

Hth.

Regards,

Re: Amal Concentric Carb Insulating Spacer? [Re: BillD47] #735135
05/13/18 3:56 pm
05/13/18 3:56 pm
Joined: Feb 2014
Posts: 1,235
Lancaster, California
C.B.S Offline

Parts Dealer
C.B.S  Offline

Parts Dealer

Joined: Feb 2014
Posts: 1,235
Lancaster, California

Re: Amal Concentric Carb Insulating Spacer? [Re: BillD47] #735201
05/14/18 4:13 am
05/14/18 4:13 am
Joined: Jan 2014
Posts: 4,266
Aus
N
NickL Offline
BritBike Forum member
NickL  Offline
BritBike Forum member
N

Joined: Jan 2014
Posts: 4,266
Aus
The Triumph carb mounting idea with the bigger sectional O-ring is also a viable alternative.
Th larger ring keeps the two flanges separated so very little heat is transferred. Care must be taken
so as not to over tighten the carbs though. The o rings are available from triumph stockists and may
be used either on their own or with the standard thin insulating spacer. I employ this method on my t'bolt
for the same reasons and have very little room for extended spacers.

The material described for use within electrical switchboards is commonly known as 'Paxolin' or 'Type-X'
It commonly comes in thicknesses from 3- 25mm or so.


No-one expects the Spanish Inquisition................
Bring in the 'Comfy Chair'
Re: Amal Concentric Carb Insulating Spacer? [Re: BillD47] #735405
05/15/18 3:30 pm
05/15/18 3:30 pm
Joined: Feb 2014
Posts: 1,235
Lancaster, California
C.B.S Offline

Parts Dealer
C.B.S  Offline

Parts Dealer

Joined: Feb 2014
Posts: 1,235
Lancaster, California
I had some issues with my A65L carbs getting hot. I went with the thickest phenolic spacer then I used the thinnest 5/16" X 24 nuts to grab onto the studs. Fixed my problems..

Re: Amal Concentric Carb Insulating Spacer? [Re: BillD47] #735509
05/16/18 7:19 am
05/16/18 7:19 am
Joined: May 2013
Posts: 5,224
West Yorkshire
Allan Gill Offline

BritBike Forum member
Allan Gill  Offline

BritBike Forum member

Joined: May 2013
Posts: 5,224
West Yorkshire
Could use longer studs


beerchug

Moderated by  Allan Gill, Jon W. Whitley 


Home | Sponsors | Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons | "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Powered by UBB.threads™ PHP Forum Software 7.6.2