Author Topic: Centre stand (1965 B40F)  (Read 942 times)

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Phil C

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Centre stand (1965 B40F)
« on: 23 April, 2022, 17:39:01 »
Evening everybody,
As it's so difficult to get my bike onto its centre stand, I'm just wondering if it's the correct one for the bike. Its design can be seen on the attached photo. I'm holding it down slightly from its at rest position in order that you can see it better. It measures 10 ins from the pivot centre to the bottom point of the foot. Does anybody know, please? Thanks in advance.
Phil

spaceman

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Re: Centre stand (1965 B40F)
« Reply #1 on: 23 April, 2022, 18:07:37 »
My B40 is 9" and my C15 is 8", the difference is due to the different sized wheels: 18" vs 17"

Phil C

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Re: Centre stand (1965 B40F)
« Reply #2 on: 23 April, 2022, 20:41:49 »
So would you - anybody - say my centre stand is an inch longer than it should be? Can anyone else give dimensions?

Phil
« Last Edit: 23 April, 2022, 21:03:04 by Phil C »

spaceman

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Re: Centre stand (1965 B40F)
« Reply #3 on: 24 April, 2022, 07:02:31 »
If you don't believe the figures I provided then have a look at Vol. 2 of Rupert Ratio which verifies these ::)

DAVE BRADY

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Re: Centre stand (1965 B40F)
« Reply #4 on: 24 April, 2022, 08:46:41 »
Hi Phil,

It looks like you may have a non-standard centre stand.  The return spring also does not look quite right.  However, you could look at reducing the feet on the one you have to shorten it a bit.
I remember my B40 was not easy to get on the main stand even with the proper one fitted.  Although I never got around to doing this, riders used to replace the rear shock top bolt with a rear footrest that would fold down. This gave a good way to hold the bike to assist in lifting it on the stand.

Dave.

Phil C

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Re: Centre stand (1965 B40F)
« Reply #5 on: 24 April, 2022, 10:44:48 »
My B40 is 9" and my C15 is 8", the difference is due to the different sized wheels: 18" vs 17"
Spaceman, Thanks very much for the info and obviously I   absolutely believe the figures you gave me, but didn't know whether the stand on your bike was standard, or difficult to use, or what, so just thought I'd ask for further comments. Sorry for any offence, and thanks again. I had looked at Rupert Ratio (vol 2), and read the relevant bits, hoping to find sizes, but stupidly hadn't noticed that the photo (p. 163) has a tape measure on it! I'll also check mine for the part number which is supposed to be cast on the inside of the legs ('40' for C15, '41' for B40, which I imagine has caused misunderstanding occasionally over the years.) Then I guess I'll shorten the feet, and have a look at the spring - thanks for pointing that out, Dave.
Phil

Phil C

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Re: Centre stand (1965 B40F)
« Reply #6 on: 24 April, 2022, 12:06:12 »
Morning again,

Further to my previous post, I've just been out to the garage and had another look at my centre stand. It is embossed "41-4705". Looking at the parts info on the BSAOC website, my bike should have a 4703. So it looks like I do have the wrong one fitted. I had a bit of a look around the info on thew website to see if I could establish which model the 4705 was meant for, but I couldn't find it.

Interestingly (well, to me anyway!), looking closely at the stand, it looks like it might have had foot extensions welded on at some stage (see photo), unless that's just the way it was made. Looking at photos in RR I think it's probably been extended, but I'm not certain, esp as I'm not sure what model 4705 was meant for and exactly what its feet should look like.

If anyone has any relevant info, eg what model the 41-4705 was meant for, and whether mine has had its feet built up, I'd be very interested. 

Phil

JulianS

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Re: Centre stand (1965 B40F)
« Reply #7 on: 24 April, 2022, 13:22:15 »
The complete centre stand comprises a number of separate parts each with there own part number. These numbers, when welded together, comprise the centre stand 41 4703.

Thses separate part numbers will not appear in the parts books.

The stand 41 4703 consists of;

Offside leg part 41 4705
Nearside leg part 41 4706
These legs are an EN8 steel stamping.

Centre stand tube part 40 4722
Spring bracket part 40 4708 EN4 steel strip

AdrianS

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Re: Centre stand (1965 B40F)
« Reply #8 on: 24 April, 2022, 13:40:33 »
I dont have much trouble getting my B40 onto the centre stand.
Are you shocks the correct length? That can affect getting the bike onto the stand.
As for the side stand......! That certainly could do with modifying to correct the lean angle!

Phil C

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Re: Centre stand (1965 B40F)
« Reply #9 on: 24 April, 2022, 14:02:29 »
I was wrong about the specified part number for my bike. Looking again at the BSAOC website, part number 4703 is for the 1965 B40. But the 1965 B40F (my model) is apparently allocated centre stand 4710.

Both the legs on mine have 41-4705 embossed on their inside. So, going by the info kindly supplied by Julian, I have two offside legs for 4703 (1965 B40.) So I've got the wrong thing. It's all very odd.

I didn't even know there was a 1965 B40 distinct from a 1965 B40F. Was there?

Confusing, eh?!

Phil

PS Adrian, re side stand, thanks for that - it's at the wrong angle? I'll have to look into that.


Mike Farmer

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Re: Centre stand (1965 B40F)
« Reply #10 on: 24 April, 2022, 14:23:14 »
 :) :) :) :)

I have this problem, but I reckon its down to my lack of ooomph. So I have a 3"x 2"X6" chamfered block of wood. Run rear wheel onto block, put the stand down and rock the bike off the block. Easy peesy.

Mike 8) 8) 8) 8)

JulianS

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Re: Centre stand (1965 B40F)
« Reply #11 on: 24 April, 2022, 14:30:20 »
Phil

I dont think you stand is made of the wrong parts, could well be that both legs are the same basic part but differing only in machining to give off side and nearside different numbers.

My own experience with a 1961 B40 was that it was not particularly easy to get on the stand, no kick leg to get your foot on for example. So your experience may not be much different from that of some other owners and your bike may just be a typical B40.

I would very cautious of shortening the legs you could end up worse than it is already. Sometimes a stand has had pads welded to the feet to compensate for wear in the feet, the pivots or the mounting lugs on the frame

spaceman

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Re: Centre stand (1965 B40F)
« Reply #12 on: 24 April, 2022, 15:09:02 »
If I put my 1965 B40 on the centre stand, the front wheel is barely lifted off the ground. It's possible the stops on the stand are a little worn and the stand slopes forward slightly more than it should although it looks ok to the eye.

If the front wheel on the B40 in question is lifted 2" off the ground when the bike is put on the centre stand then the stand is probably too long. If the wheel is only lifted 1", the stand is ok in terms of length.



Phil C

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Re: Centre stand (1965 B40F)
« Reply #13 on: 24 April, 2022, 17:49:13 »
Thanks everyone.

When I put the bike on the stand, both wheels are just touching the ground. The front one can be revolved by hand but it is rubbing on the ground. So that, I guess, means either the stand is NOT too long, or maybe the angle it sits at when in use is wrong? Please see photo. Any thoughts please?

Phil.

JulianS

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Re: Centre stand (1965 B40F)
« Reply #14 on: 24 April, 2022, 18:13:37 »
Old photo, not the best quality, of my B40. Back tyre about 1/2 inch off ground.

I think there will be some wear at the top of your stand or the frame mounting lug causing the angle. Looks like a previous owner has welded a pad to the feet to compensate