Hi Baz,
The kickstart ratchet nut 76-0271 according to a listing off the internet is 1/2" BSC 20tpi
The clutch centre retaining nut 40-3227 is shown in the BSA parts list as 1/2" BSC
So both cycle threads
Search found 449 matches
- Wed Jan 20, 2021 8:04 pm
- Forum: Tech
- Topic: Gearbox main shaft thread size
- Replies: 3
- Views: 130
- Sat Jan 16, 2021 6:13 pm
- Forum: Tech
- Topic: Stripped thread - tank rack
- Replies: 4
- Views: 155
Re: Stripped thread - tank rack
Hi Jeff Thanks for the details on the Loctite Form-A-Thread. I was not aware of the product. Seems simple enough DIrections: Coat bolt with release agent Dispense and mix equal quantities of compounds on clean surface Apply into application Screw bolt into place Wait 5 minutes and remove bolt Allow ...
- Sat Jan 16, 2021 10:55 am
- Forum: Tech
- Topic: Stripped thread - tank rack
- Replies: 4
- Views: 155
Stripped thread - tank rack
. Hi The previous owner of my WDB40 fitted a Fleetstar petrol tank that accommodates a tank rack. I liked the idea of a rack so I dug out the four locating holes as they were full of filler. I than ran a 1/4" bsc (cycle) tap down the holes. Three of the holes are fine but one has no thread left at ...
- Thu Jan 14, 2021 3:46 pm
- Forum: Tech
- Topic: B50 hydraulic drum brake
- Replies: 39
- Views: 1039
Re: B50 hydraulic drum brake
Hi All I guess a welder that knows what they are doing could weld the aluminium brake cylinder directly to the back of the brake plate. Assuming there was no distortion in the cylinder caused by the welding process it would make the front face look a little neater as there would be no need for the s...
- Thu Jan 14, 2021 1:58 pm
- Forum: P92 Tech
- Topic: Not sure If this is relevant P55?
- Replies: 9
- Views: 3249
Re: Not sure If this is relevant P55?
Hi Gerry
Not sure what P51 and P52 are as there are only drawings of footrest and kickstart. P50 is the A70 twin so P51, P52 could be derivatives.
I also think all the ETED drawings are various versions of the 350 twin that became the Fury / Bandit
Not sure what P51 and P52 are as there are only drawings of footrest and kickstart. P50 is the A70 twin so P51, P52 could be derivatives.
I also think all the ETED drawings are various versions of the 350 twin that became the Fury / Bandit
- Thu Jan 14, 2021 8:14 am
- Forum: Tech
- Topic: B50 hydraulic drum brake
- Replies: 39
- Views: 1039
Re: B50 hydraulic drum brake
Hi eebtr7 I understand your username a bit better now re: TR7, as kid my late Father had a TR2, much fun was had :razz: What has been known for a while and has now been further detailed in print (*) i.e. the brake plate on your B50SS was originally designed to accommodate a hydraulic brake set-up i....
- Thu Jan 14, 2021 8:11 am
- Forum: Books and other info
- Topic: Thunderbolts & Lightning, Peter Crawford
- Replies: 0
- Views: 520
Thunderbolts & Lightning, Peter Crawford
I recently purchased a copy of 'Thunderbolts & Lightning - Vol I - The Road Bikes' by Peter Crawford as I run a brace of A65's as well as B50's. It's a very well put together book with many contributions from the people who worked at BSA at the time. I've found it a great accompaniment to Brad Jones...
- Wed Jan 13, 2021 8:41 pm
- Forum: Tech
- Topic: B50 hydraulic drum brake
- Replies: 39
- Views: 1039
Re: B50 hydraulic drum brake
Hey eebtr7, just remember if the BSA designers had got there way back in the early 70's your B50SS would have come fitted with a hydraulic front brake as standard from new 

- Wed Jan 13, 2021 7:00 pm
- Forum: P92 Tech
- Topic: Not sure If this is relevant P55?
- Replies: 9
- Views: 3249
Re: Not sure If this is relevant P55?
. Hi Claus During the film Angus does state that the owner calls the engine P55. I've not seen reference to this engine before. With reference to Edward Turner you are correct that by 1967 Turner had set up his own consultancy company, ETED, Edward Turner Engineering Developments (?). I do not have...
- Wed Jan 13, 2021 10:02 am
- Forum: Tech
- Topic: B50 hydraulic drum brake
- Replies: 39
- Views: 1039
Re: B50 hydraulic drum brake
Hi Basil
I was going to raise the same query as Gerry. Now you have explained it I can see the offset from the picture of the brake cylinder you provided
I was going to raise the same query as Gerry. Now you have explained it I can see the offset from the picture of the brake cylinder you provided
- Mon Jan 11, 2021 5:03 pm
- Forum: Tech
- Topic: B50 hydraulic drum brake
- Replies: 39
- Views: 1039
Re: B50 hydraulic drum brake
+1
Nice work
Nice work
- Mon Jan 04, 2021 9:18 am
- Forum: Parts for sale
- Topic: Unit single books - Rupert Ratio and Roy Bacon
- Replies: 3
- Views: 627
Re: Unit single books - Rupert Ratio and Roy Bacon
Hi Paul
Is the 'Blueprinting B25 Engine - Mike Rothwell' book any good? Never seen a review of it
Is the 'Blueprinting B25 Engine - Mike Rothwell' book any good? Never seen a review of it
- Sun Jan 03, 2021 5:10 pm
- Forum: Project bikes
- Topic: 1972 B50 SS Return to Flight .
- Replies: 75
- Views: 2466
Re: 1972 B50 SS Return to Flight.
Regarding the exhaust pipe I'd be tempted to drill a hole through the tube from the opposite side, maybe 1/4" and then used a piece of 1/4" steel rod with a domed end on it and spend a bit of time knocking out the dent. You may be surprised at how well it comes out. Weld up the hole you drilled when...
- Sun Jan 03, 2021 11:14 am
- Forum: News
- Topic: BSA Coming back!
- Replies: 5
- Views: 855
Re: BSA Coming back!
Don't forget that Chris at Ripe Motorcycles has been flying the flag for a few years now with his BSA Electric bike; although I don't know how much longer his licence has got to run:
BSA John McLaren TAG
BSA John McLaren TAG
- Fri Jan 01, 2021 3:45 pm
- Forum: Tech
- Topic: Unable to remove valve collets
- Replies: 10
- Views: 379
Re: Unable to remove valve collets
+1 what Momus said
- Wed Dec 30, 2020 10:25 am
- Forum: Project bikes
- Topic: 1972 B50 SS Return to Flight .
- Replies: 75
- Views: 2466
Re: 1972 B50 SS Return to Flight.
Agree with Ian about the indicator stems, go with 3" front and back
- Wed Dec 30, 2020 9:38 am
- Forum: Project bikes
- Topic: 1972 CLEWS "Original owner Chuck FEETS Minert!
- Replies: 6
- Views: 411
Re: 1972 CLEWS "Original owner Chuck FEETS Minert!
Very nice find
Did you really get it for $700?

Did you really get it for $700?
- Mon Dec 28, 2020 5:21 pm
- Forum: Tech
- Topic: B50 hydraulic drum brake
- Replies: 39
- Views: 1039
Re: B50 hydraulic drum brake
Hi Basil
Hope it works out
. Looking forward to a write-up
Hope it works out

- Mon Dec 28, 2020 2:29 pm
- Forum: Tech
- Topic: Concentric premier pilot jet
- Replies: 3
- Views: 209
Re: Concentric premier pilot jet
Hi Basil
I've noted numerous discussions on other forums regarding the drillings of various Amal components (including pilot jets cross drillings) indicating that stated sizes vary, so worth checking prior to fitting
I've noted numerous discussions on other forums regarding the drillings of various Amal components (including pilot jets cross drillings) indicating that stated sizes vary, so worth checking prior to fitting
- Tue Dec 22, 2020 8:44 am
- Forum: Project bikes
- Topic: B50/44 Hybrid
- Replies: 21
- Views: 1107
Re: B50/44 Hybrid
Hi Claus You don't know what damage the frame may have suffered over the years so best follow Momus's advice regarding chain alignment first and then sort out the spacers. You may also have to remove the cross tube that links the footrest mounts so that the oil pipe union on the bottom of the motor ...
- Wed Dec 16, 2020 9:39 am
- Forum: News
- Topic: Stan Millard
- Replies: 20
- Views: 1774
Re: Stan Millard
+1 what Kommando said, it would make a fitting tribute to Stan's wise words


- Tue Dec 15, 2020 8:25 am
- Forum: News
- Topic: Stan Millard
- Replies: 20
- Views: 1774
Re: Stan Millard
Totally devastated by the news His absence on the forum had been noted. He helped me out numerous times with advice and parts and I won't forget him. ................ and if anyone is ever searching for advise about B50's you should do no more than search under his username 'HPbyStan' on this Forum ...
- Sun Dec 13, 2020 4:15 pm
- Forum: Tech
- Topic: Seat brackets size
- Replies: 14
- Views: 800
Re: Seat brackets size
Just for reference I have measured a couple of dual seats, the spacing of the mounting studs is 8.1/2" (216mm). The frame mounted metal bracket the stud locates into has a diameter of 7/16" (11mm) - the stud is 5/16", so the factory made a generous allowance for tolerance due to variations in seat t...
- Fri Dec 11, 2020 8:51 pm
- Forum: Tech
- Topic: Seat brackets size
- Replies: 14
- Views: 800
Re: Seat brackets size
Hi bbenxe There does seem to be some slight variation in the size and location of the brackets. I'd very tempted to offer up the seat you intend to use and weld the brackets to fit your seat. Of the three complete oif singles I have at the moment 2 are a complete pig to fit the seat requiring pushin...
- Wed Dec 09, 2020 8:11 am
- Forum: Project bikes
- Topic: Plum Crazy E35 Fury Project
- Replies: 265
- Views: 128337
Re: Plum Crazy E35 Fury Project
Hi Malc
I read the same ad the other day and thought the same as you
P.S. Did you see it in that new A65 book?
I read the same ad the other day and thought the same as you
P.S. Did you see it in that new A65 book?
- Tue Dec 08, 2020 6:00 pm
- Forum: Project bikes
- Topic: Plum Crazy E35 Fury Project
- Replies: 265
- Views: 128337
Re: Plum Crazy E35 Fury Project
.
£5,250 for just the frame?
Do you think the vendor got the decimal point in the wrong place?
Or maybe the wrong currency? 
£5,250 for just the frame?

Do you think the vendor got the decimal point in the wrong place?


- Tue Dec 08, 2020 10:42 am
- Forum: Parts & Bikes wanted
- Topic: Petrol tank rubbers - oif
- Replies: 5
- Views: 500
- Mon Dec 07, 2020 6:32 pm
- Forum: Parts & Bikes wanted
- Topic: Petrol tank rubbers - oif
- Replies: 5
- Views: 500
Petrol tank rubbers - oif
Anyone know a UK source for the horseshoe tank rubbers, 83-3563, 3/4" thick at top? I though there were some listed on ebay but not been able to track them down. Any help appreciated
- Wed Dec 02, 2020 9:50 am
- Forum: Tech
- Topic: New Amal Premier Carb/Tickler Issue
- Replies: 3
- Views: 476
Re: New Amal Premier Carb/Tickler Issue
Hi johnu
I agree with Momus that a 6mm tufnol or equivalent spacer would help. However it looks to me that the stud is too long. All my B50's are only showing a maximum of a couple of threads visible after the nut. Overall length of stud should be 1.1/4"
I agree with Momus that a 6mm tufnol or equivalent spacer would help. However it looks to me that the stud is too long. All my B50's are only showing a maximum of a couple of threads visible after the nut. Overall length of stud should be 1.1/4"
- Tue Dec 01, 2020 5:02 pm
- Forum: Parts & Bikes wanted
- Topic: Decent Tank Taps
- Replies: 12
- Views: 920
Re: Decent Tank Taps
Hi Jon I'll be interested in any replies you get as one on my B50T has just sheared and one on the WDB40 did the same a couple of weeks ago. Not sure if its to do with ethanol fuel causing the rubber seal to swell so tight that the force you apply to move the lever overcomes the strength of the meta...
- Mon Nov 30, 2020 2:33 pm
- Forum: P92 Tech
- Topic: Project 92
- Replies: 53
- Views: 47971
Re: Project 92
Hi Bob
Alan's notes make interesting reading......
Regarding the XON series of registrations there are others on the forum that will be able to contribute more accurately than I can
Alan's notes make interesting reading......
Regarding the XON series of registrations there are others on the forum that will be able to contribute more accurately than I can
- Sun Nov 29, 2020 7:35 pm
- Forum: P92 Tech
- Topic: Project 92
- Replies: 53
- Views: 47971
Re: Project 92
Hi Bob, thanks for the additional info and pics.
You mentioned the bike was used as works transport, is it one of the 'XO' series of registrations that were kept for use by BSA?
You mentioned the bike was used as works transport, is it one of the 'XO' series of registrations that were kept for use by BSA?
- Sun Nov 29, 2020 9:44 am
- Forum: Tech
- Topic: Brake master cylinder.
- Replies: 7
- Views: 654
Re: Brake master cylinder.
Fantastic
If you get stuck on detail Paul (beesa71) may be able to help, reference the original M&T version

If you get stuck on detail Paul (beesa71) may be able to help, reference the original M&T version
- Sat Nov 28, 2020 1:16 pm
- Forum: Tech
- Topic: Brake master cylinder.
- Replies: 7
- Views: 654
Re: Brake master cylinder.
Hi Basil
Are you upgrading the B50 to a single disc front end?
The same item is a bit cheaper from BBB:
stainless-front-master-cylinder-c-w-lever-triumph-1973-78 £112.80 + £9.54 shipping
Are you upgrading the B50 to a single disc front end?
The same item is a bit cheaper from BBB:
stainless-front-master-cylinder-c-w-lever-triumph-1973-78 £112.80 + £9.54 shipping
- Thu Nov 26, 2020 8:37 pm
- Forum: P92 Tech
- Topic: Project 92
- Replies: 53
- Views: 47971
Re: Project 92
Hi Bob Thanks for sharing :thumb Makes interesting viewing. Essentially oif chassis converted to isolastic with a disc front end, although there must be a lot of other detail changes. They lost the under tank electrics box. I can see the coil still under the tank. Where'd they put the rest of the el...
- Fri Nov 20, 2020 3:51 pm
- Forum: Off topic
- Topic: B65 Mongrel
- Replies: 23
- Views: 2951
Re: B65 Mongrel
.
A bit more welding completed. Set up with wheels and suspension to check monoshock top mount location
. . .
A bit more welding completed. Set up with wheels and suspension to check monoshock top mount location
. . .
- Fri Nov 20, 2020 9:25 am
- Forum: Project bikes
- Topic: 74 TR5 MX Project For Ken
- Replies: 115
- Views: 15192
Re: 74 TR5 MX Project For Ken
Looking good 

- Thu Nov 19, 2020 8:43 am
- Forum: Tech
- Topic: Decompressor Lever Alternative
- Replies: 2
- Views: 544
- Sat Nov 14, 2020 4:37 pm
- Forum: Off topic
- Topic: B65 Mongrel
- Replies: 23
- Views: 2951
Re: B65 Mongrel
.
A little more progress
. . .
A little more progress
. . .
- Thu Nov 12, 2020 8:43 pm
- Forum: Tech
- Topic: b40 engine rotation ?
- Replies: 5
- Views: 714
Re: b40 engine rotation ?
Hi Andy
Which side of the engine are you looking at?
anticlockwise from the clutch side
Which side of the engine are you looking at?

anticlockwise from the clutch side