Author Topic: A7SS Correct Valve info  (Read 598 times)

Offline Terryb

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A7SS Correct Valve info
« on: 22.12. 2016 18:42 »
Can any body Help?

I have a 1955 A7SS (engine no.2367) and I'm trying to get the correct replacement valves to replace a mixed bag of pick and mix valves. The existing valves in the head at the moment are 67-741 on the inlet side and a V15 and V16 on the exhaust side.

One source tells me they should be 67-394 (IN) and 67-395 (EX) another tells me 67-531 (IN) and 67-532 (EX)

Does anybody know the correct numbers?
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Online muskrat

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Re: A7SS Correct Valve info
« Reply #1 on: 22.12. 2016 19:02 »
G'day Terry.
67-531 & 67-532 for the alloy head A7SS.
Cheers
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'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
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beezermacc

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Re: A7SS Correct Valve info
« Reply #2 on: 22.12. 2016 22:24 »
According to my information there are three part numbers for the inlet valves, 67-394 / 531 / 740. Alpha (UK) list one inlet valve for the full range of A7 and A7SS which is V15 and measures 1.315". I don't know why the BSA part number changed. There is exactly the same scenario for the exhaust valves; BSA numbers 67-395 / 532 / 741, Alpha V16, 1.285".
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Offline Terryb

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Re: A7SS Correct Valve info
« Reply #3 on: 23.12. 2016 10:27 »
OK thanks guy's, but the plot thickens. I've just checked and the Cylinder Head part number is stamped 67-1106, is this an A7 or A10 Head, any one know?

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Online bsa-bill

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Re: A7SS Correct Valve info
« Reply #4 on: 23.12. 2016 10:57 »
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All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Online muskrat

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Re: A7SS Correct Valve info
« Reply #5 on: 23.12. 2016 19:23 »
G'day Terry.
 "The valves were 1958/59 super rocket, intake #67-968-1.41", exhaust #67-967-1.38"."
I just fitted these valves to my 1102 head but I had to use the A7SS springs and collar with the SR collets.
Cheers
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'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
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Offline Terryb

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Re: A7SS Correct Valve info
« Reply #6 on: 28.12. 2016 09:54 »
OK Guy's thanks for the advice on the valves, next question:

Head gasket - Looking at the parts book 1954-57 edition for 500cc and 650cc bikes, the part number for 'A' Group (Plunger and Swinging Arm Frames) is 67-255. I can not find any other numbers for a 1955 A7SS, so am I to assume that this gasket fits both A7's and A10's?
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Online Greybeard

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Re: A7SS Correct Valve info
« Reply #7 on: 28.12. 2016 11:27 »
OK Guy's thanks for the advice on the valves, next question:

Head gasket - Looking at the parts book 1954-57 edition for 500cc and 650cc bikes, the part number for 'A' Group (Plunger and Swinging Arm Frames) is 67-255. I can not find any other numbers for a 1955 A7SS, so am I to assume that this gasket fits both A7's and A10's?

You should start a new thread for this question. Makes it easier to search for later.
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