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#712704 - 10/25/17 8:34 pm 1955 A10 Golden Flash Rocker box.  
Joined: Jan 2014
Posts: 18
Samsmc1 Offline
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Samsmc1  Offline
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Joined: Jan 2014
Posts: 18
Houston, Texas
I need help - I'm restoring a '55 A10 from a large pile of parts. Most of the sheet metal and hard to get stuff was there - I just had to figure out what was correct for the '55 model. I'm about 90% of the way there, but I'm jammed up on the rocker box. BSA appears to have used a number of different rocker box's on just the A10's excluding what they used on the A7's. All have numbers on the bottom, but they do not conform to the parts list.
I think the new valves in the head must be the correct length or I couldn't get any rocker box over them. Just to be on the safe side, can anyone tell me what the installed height of the valve or collar to head should be.
The box that works on a later aluminum head model will not go past the valve collars. This box is stamped 42-1142. I have a box stamped 67-260 that fits (barely) over the valve collars, but does not match up with the correct push rods. BSA says the correct part number for the box I need is 67-259. Can anyone tell me what number should be stamped on the bottom of the box correct for a '55 model iron head A10?

Thanks
Sam

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#712706 - 10/25/17 9:02 pm Re: 1955 A10 Golden Flash Rocker box. [Re: Samsmc1]  
Joined: Aug 2015
Posts: 931
Andy Higham Online content
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Andy Higham  Online Content
BritBike Forum member

Joined: Aug 2015
Posts: 931
Bolton Lancs UK
When I bought my '54 A10 it had an iron head, I later fitted a super rocket head-same rocker box, I then fitted a heavily modified A7 twin port head-again with the same rocker box.
The only difference was the length of the holding down studs


1955 BSA B31 400cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350cc
1967 Greeves 360cc Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
Modified Nu-Trak GM500cc sprint/LSR bike "Deofol"
2003 Aprilia RSV Mille "Lo Stregone"
#712745 - 10/26/17 6:28 am Re: 1955 A10 Golden Flash Rocker box. [Re: Samsmc1]  
Joined: May 2004
Posts: 3,548
BSA_WM20 Online content
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BSA_WM20  Online Content
BritBike Forum member

Joined: May 2004
Posts: 3,548
Sydney Australia
Originally Posted by Samsmc1
I need help - I'm restoring a '55 A10 from a large pile of parts. Most of the sheet metal and hard to get stuff was there - I just had to figure out what was correct for the '55 model. I'm about 90% of the way there, but I'm jammed up on the rocker box. BSA appears to have used a number of different rocker box's on just the A10's excluding what they used on the A7's. All have numbers on the bottom, but they do not conform to the parts list.
I think the new valves in the head must be the correct length or I couldn't get any rocker box over them. Just to be on the safe side, can anyone tell me what the installed height of the valve or collar to head should be.
The box that works on a later aluminum head model will not go past the valve collars. This box is stamped 42-1142. I have a box stamped 67-260 that fits (barely) over the valve collars, but does not match up with the correct push rods. BSA says the correct part number for the box I need is 67-259. Can anyone tell me what number should be stamped on the bottom of the box correct for a '55 model iron head A10?

Thanks
Sam


Sam ,
part 67-259 is what happens when part number 67-260 is fully machined.
A part number is always stamped into a part.
Ant other number is the raw casting / forging before machining.
Generally the finished number will be 1 less so
67-260 + machining = 67-259

Last edited by BSA_WM20; 10/26/17 6:29 am.

Bike Beesa
Trevor
#712792 - 10/26/17 3:42 pm Re: 1955 A10 Golden Flash Rocker box. [Re: BSA_WM20]  
Joined: Jan 2014
Posts: 18
Samsmc1 Offline
BritBike Forum member
Samsmc1  Offline
BritBike Forum member

Joined: Jan 2014
Posts: 18
Houston, Texas
That makes sense. I wonder why I'm having so much trouble with the push rods now that I have a box that fits over the valves. I have the correct length push rods, yet they appear to be to short. I had the lifters ground by Megacycle, but they only removed a minor amount of metal - these pups are 3/16th too short.
Thanks
Sam

#712807 - 10/26/17 5:22 pm Re: 1955 A10 Golden Flash Rocker box. [Re: Samsmc1]  
Joined: Aug 2015
Posts: 931
Andy Higham Online content
BritBike Forum member
Andy Higham  Online Content
BritBike Forum member

Joined: Aug 2015
Posts: 931
Bolton Lancs UK
There are only three alternatives for pushrod sets, Pre 1950 A7 (longs troke), post 1950 A7 and post 1950 A10
If yours are too short they may be A7


1955 BSA B31 400cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350cc
1967 Greeves 360cc Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
Modified Nu-Trak GM500cc sprint/LSR bike "Deofol"
2003 Aprilia RSV Mille "Lo Stregone"
#712809 - 10/26/17 5:46 pm Re: 1955 A10 Golden Flash Rocker box. [Re: Samsmc1]  
Joined: Jan 2014
Posts: 18
Samsmc1 Offline
BritBike Forum member
Samsmc1  Offline
BritBike Forum member

Joined: Jan 2014
Posts: 18
Houston, Texas
I already measured them - they're just over 8 1/2 and 9 1/2 inches.


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