Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.

Messages - AdrianS

Pages: [1]
Singles / Clutch cable routing
« on: 22 February, 2018, 10:31:43 »
Sorry to bother everyone with another small problem with my B40 rebuild.

What is the route of the clutch cable?
I cannot see what the best route for it is without fouling the chain or having to bend it through some very sharp bends.
I did see one B40 where someone had put a "P" clip on the engine rear mounting bolt to support the cable but that left a right angle bend into the engine case.

All advice appreciated!


Singles / Re: B40 wiring advice and spacer advice
« on: 21 February, 2018, 18:51:49 »
I had a look at another B40 this afternoon - had the spacer in the same place as mine!

Singles / Re: B40 Star air filter - what's the best option now
« on: 21 February, 2018, 11:28:13 »
The filter hasn't been put in back to front has it? It looks like the perforated gauze may be resting against the filter housing plate!

Singles / Re: B40 wiring advice and spacer advice
« on: 21 February, 2018, 11:25:00 »
Thanks for the advice
Here is a picture of the collar in place on the left hand pivot. I originally thought one of the bolts was a bit longer but mine are the same length. I think if the spacer is not needed I shall remove it

Singles / B40 wiring advice and spacer advice
« on: 20 February, 2018, 17:37:36 »
I am in the process of putting my B40 (1961) back together. 2 questions I hope can be answered:

1. I cant remember the order of the electrical components that are fitted under the seat on the crossmember. Can anyone help? Also does the loom go under the frame tube or to one side of it?

2. I have a distance piece about 7/8 x 3/8 inch which I am sure came of one end of the swinging arm. I have fitted it to the left hand side so that it makes access to the bolt and grease nipple better. It looks like it should be there but my concerns are a) I cannot find reference to it in any parts diagram and b) the swinging arm bolt is only going into the swinging arm shaft by about 3/8 inch because of the spacer.
Should I leave it or take it out before I get any further with the rebuild?  I have looked at many pictures on the internet and enlarged them but cannot see for certain what is on the bike.

ps there is a spacer on the parts diagram 108  41-4055  Not sure what this is for. It could be the spacer I have



Singles / Re: B40 Star air filter - what's the best option now
« on: 19 February, 2018, 18:54:06 »
Thats the same as my 1961 B40. I've got the monobloc carb.
I am missing the rubber seal that looks present on  you filter.
I still wonder how effective the filter is though as the pipe from the carb to the filter housing I don't feel is a very good fit.
Also a lot of British bikes had no air filters fitted. Often a chrome ring or trumpet with a wire gauze inside was fitted to the carb.
The problem with running no filter is that the bike probably will be running lean.

Singles / Re: B33 Engine rebuild recommendations
« on: 16 February, 2018, 17:49:50 »
RTS Racing may be able to help - Roger spends his life re engineering BSA singles.He is just south of Malvern. Google him and have a chat to him.

Singles / Re: B40 swing arm - quick question
« on: 07 February, 2018, 10:02:23 »
I think the lateral play is taken up by the shim between the swing arm and frame on the drive side.
I think the spacer goes on the drive side as I've looked at a few pictures and no spacer appears on the right side of the bike. The parts drawing is not very clear about the spacer and the part numbers for the 2 bolts are different

Singles / B40 swing arm - quick question
« on: 06 February, 2018, 18:38:04 »
Just had my seized swing arm sorted - only took 2 months but now bike is ready to reassemble. The swing arm pivot had to be pressed out and a new pivot fitted plus bearings in the arm.

I didn't make a note of the fittings at each end of the swing arm. I've got 2 bolts with grease nipples on, one longer than the other and also got a spacer. Can anyone let me know which side the longer bolt and spacer goes. Can't seem to find any drawings confirming the position!


Singles / Re: C15 brake pedal return spring location
« on: 01 February, 2018, 18:14:06 »
My B40 didn't have a return spring at all when I got it. The rear brake shoe springs returned the pedal. However on rebuilding I managed to source a concentric spring which is strong enough to return the pedal. The early models of the B40 and I assume C15 had a standard expansion spring attached to the frame and brake pedal.

Singles / Re: B40 Brake return spring
« on: 15 January, 2018, 22:16:33 »
I haven't seen a picture of a linear spring - the brake light switch has a linear spring; I don't know if there would be enough room for another spring. I wonder if the later spring would retro fit to the early models?

Singles / B40 Brake return spring
« on: 15 January, 2018, 18:32:22 »
Is there a brake pedal return spring on the pivot of the rear brake pedal?
My bike hasn't got one and some drawings don't show one. I believe the C15 has a spring. I wondered if the B40 one (if it needs one) is the same?

Singles / shimming brake shoes
« on: 21 December, 2017, 17:39:08 »
I know this has been discussed before but there doesn't seem to be any "rules" about doing this.

The front brake lever is most effective at 90 degrees to the cable when operated. Sometimes it is difficult to compensate for wear by moving the operating lever to another position as the brake cam end is square shaped. Also the hub can also wear a little inside.
Oversize linings can be fitted but is it ok to fit shims over the ends of the shoes ( made out of tin cans ) to take up a bit of the space between the brake shoe and drum?

Singles / Re: B40 Swinging arm and a few questions.
« on: 18 October, 2017, 16:11:31 »
Thanks for the quick answers.

It appears that I've got to completely strip the bike to get the frame to have the swinging arm looked at and the pin pressed out if possible.

One other quick question; does the pivot tube at the top of the rear part of the frame just push out with a bit of persuasion?



Singles / B40 Swinging arm and a few questions.
« on: 18 October, 2017, 09:19:34 »
New to this forum.
Recently bought a B40 ( 1961) which needed tidying. Came with a 12 month MOT so was usable.
However, I started dismantling with a view to repainting etc and everytime I remove something, a new problem arises.
At present the bike is just a frame with the engine in. I would appreciate a bit of advice on:

1. The swinging arm is solid - I cannot move it in the frame! I assume the pivot axle is seized. Any advice?
2. The battery box has virtually rotted away so will need rebuilding. Has anyone got a photo of what it should look like so I can get an idea of what to make?
3. How heavy is the engine  ? is it easy to lift out without any help?
4. Where is the best place for parts ?

Pages: [1]