Author Topic: C11 Head Gasket  (Read 237 times)

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Offline BeenyBoy

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C11 Head Gasket
« on: November 24, 2020, 08:22:59 pm »
1949 C11 Rigid

Prior to stripping the engine I ordered a gasket set. When this arrived I noticed that the "hole" in the head gasket for the bore is actually oval- the supplier claims this is correct- but surely the bore is round so the gasket needs to fit it....or is it one of those strange BSA quirks ?
1955 B31;1954 C11G;1971 B175;1949 C11

Online Owen

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Re: C11 Head Gasket
« Reply #1 on: November 24, 2020, 08:44:54 pm »
Some makes are especially near the valves
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11

Online newc10guy

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Re: C11 Head Gasket
« Reply #2 on: November 25, 2020, 12:53:43 am »
I think mine is oval as well.
Do these new head gaskets need annealing, or can they be used as is?
'46 c11 (nearly resurrected)
'51 AJS 18 (next in line)
'74 TL125 (saved from the skip)

Online timsdad

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Re: C11 Head Gasket
« Reply #3 on: November 25, 2020, 07:31:15 am »
I always anneal copper gaskets before fitting them as, even if unused, they can go hard with age. We never know how long the gasket or copper sheet has been laying on a shelf. - works for me.


Ray
Just a motorcyclist.

Offline BeenyBoy

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Re: C11 Head Gasket
« Reply #4 on: November 25, 2020, 11:03:00 am »
I guess I won't know until I've got the head off...however I'm sure the gasket on my 1954 C11G was round......Interesting...
1955 B31;1954 C11G;1971 B175;1949 C11