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Topics - Greenfield

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1
Pre War / 'B' series girders
« on: 15 March, 2024, 15:19:30 »
My B21 restoration continues. Unfortunately so far very little is being restored and there are more and more parts needing restoration. So far I've drawn a blank with the kickstart bushes, so I may be looking for someone to make them.
Whilst working on the front brake I noticed a lot of movement in the top girder link. The parts book lists fork bushes 65-5078. Can anyone advise whether these are associated with the top link of the late '30s 'B' series?
Many thanks in anticipation.

2
Pre War / B21 kickstart bushes
« on: 11 March, 2024, 16:11:07 »
As you may gather, I'm getting stuck into getting a B21 deluxe up and running. There is distinct play in the kickstart and in my innocence I removed the gearbox outer cover expecting to find a bush for renewal. There was just a bush for the gear lever which is good. The parts book lists kickstart quadrant bush 65-3116 and cover bush 65-3134. Are these both behind the inner cover?
There was no outer cover gasket, just sealant. Am I correct in thinking that there should be gasket 65-3022? All good fun.

3
Pre War / B21 speedo drive
« on: 09 March, 2024, 16:22:27 »
I have a rather sad looking speedo drive from a B21 in need of tlc. It has a cork to prevent dirt getting into the mechanism. Presumably there was a removable cover originally to allow access to the gears for lubrication. I anyone able to shed any light on the subject?
Cheers

4
Pre War / B21-B26 parts
« on: 04 March, 2024, 20:49:20 »
I can see the 1938 parts lists in Library search but does anyone do a parts book with exploded views, so you can hopefully see which part joins to which in these prewar bikes?

5
Pre War / B24 parts
« on: 19 February, 2024, 18:34:01 »
I'm looking at the feasibility of restoring a B24 basket case. Can anyone advise on the possibility of finding a cylinder head and front forks, plus some hen's teeth if pos.

6
Singles / Heplex 11341 piston
« on: 17 January, 2024, 08:48:36 »
I've just removed the piston from my 1950 B33. It's a heplex 11341 with maximum skirt diameter around 86.4mm. There are no markings to indicate whether it is standard, +20, +40 etc and would like to fit new rings.
Does anyone know what size it's likely to be?
Can anyone suggest where I might obtain some rings?
And when I reassemble, should the split in the skirt be at the front or back, or doesn't it matter (it was facing the front)?
Cheers

7
Singles / B33 cams/cam followers
« on: 12 August, 2023, 13:39:07 »
There is a very audible click when the exhaust valve on my 1950 B33 fully opens. With the plug out, and with the rocker cover and tappet adjuster cover removed, by turning the back wheel in top gear its difficult to tell where the source is. Sometimes I can see a definite twitch of the tappet accompanying the click as the pushrod goes over the top. I am suspecting that the problem is at the bottom end ie cam and or cam follower. I'm betting that this isn't going to be an easy fix. Any thoughts would be appreciated.
Cheers

8
Singles / C15/B40 primary chain tensioner
« on: 17 July, 2023, 08:51:54 »
The primary chain tensioner on the B40 is simple and effective. However, the chain slides over the steel surface of the tensioner gradually wearing grooves and releasing particles of steel into the primary case which in turn increases the wear of chain and sprockets. The primary chain, sprockets and tensioner can be regarded as renewable service items. As far as I can remember, the surface of the A50/A65 tensioner is a hard rubber material and nylon is used on other brands. Has anyone tried a modification to reduce the steel on steel wear that has proved effective?

9
The Star and Garter / Cable nipple soldering
« on: 07 June, 2023, 12:40:58 »
Perhaps an old topic but just looking for some quick tips.
I'm having a problem soldering a brass nipple to the end of a brake cable; which is presumably made of stainless. I just can't get the solder to fuse with the cable, even on the freshly cut ends of the cable strands. With other cables its simply been a matter of remelting the solder but with my current cable, the cable has been shortened so I need to 'wet' fresh cable. It's been thoroughly degreased and polished with emery, but the question is what flux to use without spending an arm or a leg? My searches indicate that it needs to be phosphoric acid based.
Any tips?

10
Singles / B40 crankcase tie bolts
« on: 21 May, 2023, 15:47:45 »
Does anyone know the part number or length and thread of the top crankcase tie bolt (which clamps the bottom of the barrel) on a '63 B40? It's much longer than the ones beneath. Red arrow in attached photo.
Cheers

11
Singles / Screws i B33 cylinder head
« on: 03 May, 2023, 17:25:47 »
Hi all
A quick question:- What are the two screws for in a B33 cylinder head near side? I'm guessing something to do with the oil supply to the rockers.

12
Singles / B40 gearbox sprocket
« on: 16 March, 2023, 15:36:47 »
Has anyone come across a 20T gearbox sprocket for a B40 (1962)? The standard one is 19T pt no 40-3123 but BSAUNITSINGLES shows a 20T one as being 'British made'. I'm wondering whether anyone has experience of fitting one of these and a possible supplier.

13
Singles / Smiths chronometric speedo S.433/3/L
« on: 20 February, 2023, 11:31:06 »
I'm looking to replace the bezel on a Smiths chronometric speedo, S.433/3/L. I've been looking at various ads and there seems to be different sorts of bezel and kits with a bezel, glass and rubber seal, but how is the glass fixed into the bezel? On mine looking from above it looks as though there's black sealant oozing between the glass and bezel, and from below it looks as though the edge of the metal it turned over to retain the glass. Does anyone know if it's possible to separate the glass and bezel or was it pressed together in the factory?

14
Singles / Compression testing
« on: 04 December, 2022, 11:53:16 »
Some months ago I started a post about preignition problems with my B33. Just recently I fitted a decompression plate to see what the effect would be. I'm interested to see what the compression ratio is now, but can't get the Hawk compression tester to work as its impossible to kick over the engine without using the valve lifter as in starting. Am I attempting the impossible?
It works fine on my A50 and B40.

15
Singles / M01 magneto
« on: 12 October, 2022, 17:27:55 »
I was out on a test run of around 5 miles on the B33 last week checking for leaks after rebushing the outer gearbox case. Less than 1/4 mile from home the engine died and wouldn't start. Luckily I could coast home downhill. There is no spark at the plug or HT lead. I have checked and cleaned the magneto brushes, but still no spark. Before I get the magneto onto the bench, am I missing something obvious? A previous owner spent a bit of money on a full service including an exchange armature in 2014 and the bike's done little mileage since. Strangely, the armature was replaced again after a month as the replaced one failed!
Any thoughts chaps?

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