Author Topic: A7SS Correct Valve info  (Read 521 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?

Offline 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
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
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Online 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?


Online bsa-bill

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Re: A7SS Correct Valve info
« Reply #4 on: 23.12. 2016 10:57 »
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

Offline 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
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

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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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.