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The BSA A7-A10 Forum
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Carb manifold heat resistant spacer
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Topic: Carb manifold heat resistant spacer (Read 2994 times)
Desburnett
A's Good Friend
Join Date: Aug 2009
Posts: 119
Karma: 0
BSA A7 SS, Fazer 1000, Norton Commando 850
Carb manifold heat resistant spacer
«
on:
19.10. 2009 20:37 »
A7 SS 1961
Is there a heat resistant carb spacer fitted to the manifold? I dont have one in my box of bits which I thought was complete and when mounting the carb I find the drip tray is fouling the manual advance / retard cable shroud by about 3/8".
The mag was rebuilt by SRM a few months ago, all the old replaced parts were returned to me and appear to be identical to their new parts.
The current assembly set up from the inlet manifold is,
Paper gasket
Drip tray
Paper Gasket
Carb with O ring
Spring washer
Nut
If there is a heat resistant spacer I would like to know the part number and if possible its thickness.
Thanks,
Des
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LJ.
Peterborough UK.
Wise & Enlightened
Join Date: Jun 2006
Posts: 1403
Karma: 15
The Red A10!
Re: Carb manifold heat resistant spacer
«
Reply #1 on:
19.10. 2009 21:52 »
The set up is exactly as my A10s are... Incidental My M21 had a 1/4 inch tufnel spacer between the head and carb but still did not run properly when the engine was hot. Now I have a 3/4 inch tufnel gasket the problem has been solved. The A series engines don't get anywhere near as hot as an M series engine so you'll be okay to leave as is.
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Ride Safely Lads! LJ.
**********************
1940 BSA M20 500cc Girder/Rigid- (SOLD)
1947 BSA M21 600cc Girder/Rigid-Green
1949 BSA A7 500cc Girder/Plunger Star Twin-(SOLD)
1953 BSA B33 500cc Teles/Plunger-Maroon
1961 BSA A10 650cc Golden Flash-Blue
1961 BSA A10 650cc Golden Flash-Red
old PJ
Moving Up
Join Date: Oct 2007
Posts: 30
Karma: 0
Re: Carb manifold heat resistant spacer
«
Reply #2 on:
19.10. 2009 21:58 »
I agree with LJ and my A10 has no heat spacer fitted.
Old PJ
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chaterlea25
Wise & Enlightened
Join Date: Jun 2009
Posts: 4026
Karma: 54
Re: Carb manifold heat resistant spacer
«
Reply #3 on:
19.10. 2009 22:01 »
HI,
I would recommed the use of a heat insulating washer,
Are the carb studs long enough?
I use the thickest I can fit,
I make my own ones from Tufnol so I dont know the part number
Regards
John
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1961 Super Rocket
1963 RGS (ongoing)
rocket man
Valued Contributor
Join Date: Mar 2009
Posts: 466
Karma: 2
Re: Carb manifold heat resistant spacer
«
Reply #4 on:
20.10. 2009 21:00 »
your alloy head shouldn't get too hot but i have a super rocket and i have one fitted
dave
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RichardL
Outside Chicago, IL
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Join Date: Nov 2007
Posts: 6388
Karma: 55
Re: Carb manifold heat resistant spacer
«
Reply #5 on:
20.10. 2009 23:18 »
I have one fitted and it is a listed part number (sorry, no part number while thumb typing). The problem I just discovered after running 950 mi. With it was that it was about 1/8-inch smaller in I.D. than the intake manifold I.D. Some not-so-quick work with the Dremel fixed the problem and it seems to have made a just-detectable performance difference.
Richard L.
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BSA_54A10
Wise & Enlightened
Join Date: May 2008
Posts: 2544
Karma: 37
Re: Carb manifold heat resistant spacer
«
Reply #6 on:
21.10. 2009 11:59 »
In any case you really need the Tuffnol gasket there as a smooth flat surface for the "O" ring to seal against.
Should be head , paper, drip tray, paper, tuffnol , o ring , carb
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Bike Beesa
Trevor
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The BSA A7-A10 Forum
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Technical (Descriptive Topic Titles - Stay on Topic)
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A7 & A10 Engine
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Carb manifold heat resistant spacer