Recent Posts

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Singles / Re: B40 Star air filter - what's the best option now
« Last post by AWJDThumper on 20 February, 2018, 22:47:55 »
I'll post a picture of the perforated end cap. I thought I had a spare but it turned out the one that was missing from my B40 filter!
Singles / Re: B40 Star air filter - what's the best option now
« Last post by hoogerbooger on 20 February, 2018, 22:00:17 »
Blimey 3 blobs of braze can be tenacious. One hour with a small file and junior hack saw later  & I have the attached with 10mm of outlet to attach to. ( no dremel available unfortunately)

AWJDThumper: Thank you for both suggestions which look sound. I will investigate both.

I presume it would also be sensible to see if I can fabricate an equivalent to the gauze cover ?  Looks like it was 50% metal 50% perforation. I'm guessing if I do that so that the air filter is as close as possible to the original set-up....... then I can probably use the the 'original main jet size of 140

Singles / Re: B31 head onto B33 Barrel
« Last post by sidewaysid on 20 February, 2018, 21:03:10 »
Sorry I mean Andy Higham, he seems to know a thing or two on the singles, I'm going to see if i can do that Suzuki clutch conversion like he has done.
Singles / Re: 1957 B31 Maroon colour scheme
« Last post by Daniel on 20 February, 2018, 20:30:29 »
Dear Matchymarty,

Thank you for this information, I had the hope someone had looked for it already.

Cheers Daniel
Twins / Re: Headlight bulb lighting
« Last post by CROFTY1984 on 20 February, 2018, 18:47:42 »
Hi Thumper. I have almost the identical 1971-72 diagram, it does not show the black switch that is on the top of the headlight shell. It would appear that mine was factory fitted ? Can't find it in the Lucas manuals either, a right puzzler ? Just looked on Dragonfly site, they list the switch in the headlight 19-1095 as a Kill Switch and in the price list they call it a lighting switch.
Looking at mine and comparing it with the 4 position switch I've heard of and the one on my Bonneville, I think that wiring diagram isn't 100% for my '71 and possibly your bike. With the 4 position switch you have bike on, bike off, bike on with lights (and parking) so there's no need for a black headlight rotary switch to turn the lights on and off as it's done by the key.
With mine there's a 2-position key switch for bike on and off and a separate black headlight switch for lights on and off. I'm assuming the bikes from 72 onwards is when the "all in one" key switch came in, as per the diagram.
Singles / Re: B40 wiring advice and spacer advice
« Last post by AWJDThumper on 20 February, 2018, 18:23:40 »
When I restored my B40 a few years ago, I positioned the components coil, horn, rectifier from left to right looking forward. Harness passed down RH side of top tube. Parts diagram is a little confusing. Part 41-4055 is listed as engine/frame spacer and the usual places are either between engine and frame for either the bottom or front bolts though I can't remember from memory if the B40 has either.
Singles / Re: B40 wiring advice and spacer advice
« Last post by JulianS on 20 February, 2018, 18:13:17 »
The swinging arm spacer is part 40 4213 and it fits on the offside/right side.

Diagram from 1965 parts book because I dont think it is shown in the 1961 book.

Key also from 1965 book showing it fitting on the offside.

41 4055 is a spacer with a smaller hole than the one above.
Twins / Re: Headlight bulb lighting
« Last post by AWJDThumper on 20 February, 2018, 18:00:54 »
Is the lighting switch shown in the 1973 diagram not a 3-way, 8 terminal Lucas 57SA toggle switch?
Which BSA do you ride? / Re: new to the forum and classics
« Last post by A10 JWO on 20 February, 2018, 17:57:37 »
Welcome and enjoy. Don't just pull it to bits and put it in boxes. Try putting oil down the plug holes for a few days to free it off for a start. Clean fuel tank out, clean carb and try to get a spark. Do loads of research in you spare time. I cut my teeth on Minis, not much difference. You will get lots of help on here. Don't throw anything away. If not sure takes pictures and ask us. Regards  :D
Singles / B40 wiring advice and spacer advice
« Last post by AdrianS 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


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