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Messages - Bles31

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Which BSA do you ride? / Re: My B31
« on: 21 May, 2018, 19:17:19 »
That's very pretty. Same colours as my '54 plunger model, which is slowly reaching a roadworthy condition. Very nice!

Singles / Gearbox oil seal
« on: 17 May, 2018, 19:55:13 »
Had a search and this has been discussed before - but I can't find a solution.
I replaced a  leaky oil seal on the output shaft of  my '54 plunger B31. The leak persists! The seal is fitted nicely, square to bore and just below flush with gearbox case. Sprocket shoulder the seal contacts is in good condition and I have a felt and cork seal on the output shaft - which I think is intended to seal off the end of the shaft splines. I've looked at this again and again and can't work out why the leak is there and so  bad.

A few factors - I filled the gearbox to the level of the screw in inspection port on the right hand side of the gearbox as advised - this fills box to just about the level of the oil seal on the left side. Should I try less oil?
                      Ive read about putting grease into  gearboxes - possibly reduce leakage, but not something I've done before.
                      The oil seal is meant for a shaft diameter of 1.625 " (according to the size marked on the seal - which I believe refers to the associated shaft diameter not the seal size.) but the shoulder on the sprocket is 1.722" - not a lot different, but the old seal looks a bit stretched when I try it on the sprocket -         has anyone a sprocket they can measure for  comparison (I may be over thinking this!). Puts the shoulder on my sprocket at  between 1 5/8" and 1 3/4" which seems a strange choice for an old  british bike.
I can just let it leak but would rather not. Any advice welcome.

Singles / Re: Thorspark
« on: 27 April, 2018, 15:12:10 »
Two photos attached. Still not entirely sure about clearance above coil. Toolbox is another possible position, but require very long ht lead.

Singles / Re: Thorspark
« on: 18 April, 2018, 20:08:20 »
Sorry for delayed response. I fitted a Thorspark to my 6volt B31 - it was pretty straightforward and gives a nice juicy spark. Bike starts second kick. The bike is part rebuilt so I haven't done any miles with the kit fitted. My ammeter is showing a healthy charge with the Thorspark in use, so it looks good at least for daylight use. I expect it will be OK at night as I can put on the headlamp and still show a charge. You will obviously be dependent on the battery but I'm OK with that. Get your dynamo in good nick! One thing I need to investigate is the use of a pack of AA cells as a back up should the battery go flat - some people do this apparently but I don't know what range this would give (obviously not great if lights are needed). If it looks OK a pocket full of AA's will be travelling  with me!
You will have some extra wiring to hide away - it is bright green and red. I have bought in some more subdued colours to fit when I get time. There will be a coil to mount and hide. Mine is under my single saddle - pretty well sheltered but needs careful positioning to avoid debilitating shocks!
It's really all about whether you are OK relying on your battery.
Hope this helps.

Singles / Re: !950 b31 petrol tank
« on: 15 January, 2018, 22:11:35 »
From another section of the parts list. Hope this is of some use.

Singles / Re: !950 b31 petrol tank
« on: 15 January, 2018, 21:42:07 »
There are a few different part numbers in mu BSA Parts Llist (for 1949 - 1952 B31's, Gold Stars and others). I attach the information - but find it hard to be sure which tank is used on which bike - rigid, plunger or Gold Star.

Singles / Re: !950 b31 petrol tank
« on: 14 January, 2018, 18:18:11 »
This is the tank on my 1952 plunger B31.

Singles / Re: 1950 B31 Saddle
« on: 07 January, 2018, 22:30:01 »
Saddle from below.jpg
Looks like a bit of a bodge up - I will fit something more reliable

Singles / Re: 1950 B31 Saddle
« on: 07 January, 2018, 16:44:23 »
On my 1952 model the saddle measures 13.5" from back to front, the support springs are on 8.75" centres and the front mounting bolt centre line is 11.5" from a line connecting the support springs. It fits in the tank cut out. The front crossbolt is, however, attached to the saddle metalwork using two extension plates, one fitting on either side of the frame mounted boss just behind the tank. I am trying to work out how to attach a picture.

Which BSA do you ride? / Re: Newbie, M21
« on: 01 October, 2017, 19:53:34 »
Nice looking bike - and other interesting bits reflected in the tank?

Singles / Re: 1950 b31 plunger info
« on: 17 September, 2017, 20:34:33 »
On my '52 plunger model it is 19.75" from the centre of the hole in the clevis end, to the end of the rod at the drum end.

Which BSA do you ride? / My B31
« on: 11 September, 2017, 13:47:53 »
Hello  there.
This is my  1952 B31 which has been living in my garage virtually untouched for 12 months. I've just recently got it running, but a few jobs to do. You might notice front wheel is well off centre - nearly touching right hand fork. Looks like it's not charging very well, but basically it seems a sound bike which I want ready for cake shop adventures around the Lake District next Spring.

Singles / Re: B31 stand
« on: 08 September, 2017, 21:41:39 »
Been away for a couple of weeks. Thanks to all for replies. I think I'll start with a generic stand and see how it goes.

Singles / Re: B31 stand
« on: 21 August, 2017, 21:07:51 »
Thanks to both of you. Unfortunately the part on ebay won't fit as my bike doesn't have the welded lug to which it bolts - as on Greybeard's bike. I may buy a clamp-on universal stand to help with moving around the garage and look at some way of preventing it rotating around the frame tube. Looking at the ventele device makes me wonder if something down from the seat stay (bicycle parlance) could be used to do this.
Some sort of lever added to the centre stand is also possible I suppose.
Thanks again.

Singles / B31 stand
« on: 21 August, 2017, 16:23:05 »
Hello - this is my first post. I have a 1952 B31 which I am currently making roadworthy. I will be putting it on the road to use regularly -  mainly to visit cafes and cake shops around the Lake District. One of my major problems is the lack of a useable stand so that I can work on the bike. It's currently leaning against the wall, which isn't convenient.  The bike has a centre stand but this offers no leverage at all and I find myself having to lift the weight of the bike to get it up on the stand. This is too much for my 69 year old back! Despite searching around I can't find a side stand to fit the plunger frame. Can anyone advise on side stand, source of better centre stand, mod's ?
Thank you.

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