BritBike Forum logo
BritBike Sponsor BritBike Sponsor BritBike Sponsor
BritBike Sponsor

BritBike Sponsor

BritBike Sponsor
BritBike Sponsor BritBike Sponsor BritBike Sponsor
Jwood & co JRC Engineering dealers Jwood & co
Home | Sponsors, Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons, "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Member Spotlight
jim schmidt
jim schmidt
Sanger, CA
Posts: 309
Joined: May 2006
Show All Member Profiles 
Shout Box
Search eBay for motorcycle parts in following countries
Australia, Canada, France, Holland, Italy, United Kingdom, USA
Random Gallery photo
Who's Online Now
30 registered members (Alan_nc), 228 guests, and 446 spiders.
Key: Admin, Global Mod, Mod
Newest Members
hondapete1950, Gaspare, eberhard, Norman Woollons, LandoLando
10257 Registered Users
Top Posters(30 Days)
Stuart 75
Lannis 55
TBolt72 47
Popular Topics(Views)
610,901 mail-order LSR
Forum Statistics
Forums34
Topics67,152
Posts651,660
Members10,257
Most Online3,995
Feb 13th, 2017
Like BritBike.com on Facebook

Previous Thread
Next Thread
Print Thread
Rate Thread
1955 A10 Golden Flash Rocker box. #712704
10/25/17 8:34 pm
10/25/17 8:34 pm
Joined: Jan 2014
Posts: 18
Houston, Texas
S
Samsmc1 Offline OP
BritBike Forum member
Samsmc1  Offline OP
BritBike Forum member
S
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

Support your #1 BSA Forum and our favorite sponsors

Check out BSA on e-bay: BSA Parts in UK, BSA Motorcycles in UK, BSA Parts in North America, BSA Motorcycles in North America

 
 
Re: 1955 A10 Golden Flash Rocker box. [Re: Samsmc1] #712706
10/25/17 9:02 pm
10/25/17 9:02 pm
Joined: Aug 2015
Posts: 1,134
Bolton Lancs UK
A
Andy Higham Offline
BritBike Forum member
Andy Higham  Offline
BritBike Forum member
A
Joined: Aug 2015
Posts: 1,134
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 500cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350
1967 Greeves 360 Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
GM500cc sprint/LSR bike "Deofol"
Jawa 500cc "Llareggub"
2003 Aprilia RSV Mille "Lo Stregone"
Re: 1955 A10 Golden Flash Rocker box. [Re: Samsmc1] #712745
10/26/17 6:28 am
10/26/17 6:28 am
Joined: May 2004
Posts: 3,728
Sydney Australia
B
BSA_WM20 Offline
BritBike Forum member
BSA_WM20  Offline
BritBike Forum member
B
Joined: May 2004
Posts: 3,728
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
Re: 1955 A10 Golden Flash Rocker box. [Re: BSA_WM20] #712792
10/26/17 3:42 pm
10/26/17 3:42 pm
Joined: Jan 2014
Posts: 18
Houston, Texas
S
Samsmc1 Offline OP
BritBike Forum member
Samsmc1  Offline OP
BritBike Forum member
S
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

Re: 1955 A10 Golden Flash Rocker box. [Re: Samsmc1] #712807
10/26/17 5:22 pm
10/26/17 5:22 pm
Joined: Aug 2015
Posts: 1,134
Bolton Lancs UK
A
Andy Higham Offline
BritBike Forum member
Andy Higham  Offline
BritBike Forum member
A
Joined: Aug 2015
Posts: 1,134
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 500cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350
1967 Greeves 360 Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
GM500cc sprint/LSR bike "Deofol"
Jawa 500cc "Llareggub"
2003 Aprilia RSV Mille "Lo Stregone"
Re: 1955 A10 Golden Flash Rocker box. [Re: Samsmc1] #712809
10/26/17 5:46 pm
10/26/17 5:46 pm
Joined: Jan 2014
Posts: 18
Houston, Texas
S
Samsmc1 Offline OP
BritBike Forum member
Samsmc1  Offline OP
BritBike Forum member
S
Joined: Jan 2014
Posts: 18
Houston, Texas
I already measured them - they're just over 8 1/2 and 9 1/2 inches.


Moderated by  Allan Gill, Jon W. Whitley 


Home | Sponsors | Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons | "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Powered by UBB.threads™ PHP Forum Software 7.6.1.1