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Messages - Bles31

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1
The Star and Garter / Re: Winged wheel
« on: 26 May, 2020, 10:22:12 »
https://www.cyclinguk.org/cyclists-library/components/wheels-tyres/tyre-sizes
No knowledge myself but this might be useful information.

2
Singles / Re: Gearbox oil leak
« on: 11 May, 2020, 20:38:08 »
For information, there is an interesting video of a gearbox (later type I think) rebuild on Youtube. Search for "Building a B31/B33/B34 from parts. Episode 8 of many". You can see relative heights of internals.

3
Singles / Re: Gearbox oil leak
« on: 06 May, 2020, 10:50:16 »
That seems like a logical approach and some useful information Jim S. I'm inclined to stick with filling to 10mm below the bottom edge of my filler port, in the "early" box on my B31.

 I'm specifying a level as opposed to 370/400 cc because I don't know how much oil is held in nooks and crannies in the gearbox when it is drained. So when  I drained 370 cc from my gearbox I don't know if there was some left in there, possibly bringing the total to over 370. (It might make a difference to someone who had overhauled and completely emptied the box).

From what you say, and from looking at my gearbox I believe there will be enough oil in there to splash all of the internals. I will, however, add oil  gradually to see where my leak starts. I'll feed that back, but it won't be soon!
I had a bit of a concern that the reduced oil volume might lead to excessively high temperature, but if your A10 is OK with 400 cc then that seems to say that I should be OK in that respect . My next runs, when I can eventually get out on the road, will be pretty short anyway.
Obviously everyone will have to make their own judgement on how to proceed.
Thanks for the information.

4
Which BSA do you ride? / Re: BSA B31
« on: 02 May, 2020, 21:30:04 »
Nice bike, Bill. Very like mine on Page 5.
Is it ready to go or have you a job list (silly question)?

5
Singles / Re: Gearbox oil leak
« on: 28 April, 2020, 15:59:31 »
Right - just drained gearbox. 350 ml came out pretty quickly then became a slow dribble that I couldn't be bothered to wait for. So 370ml to the bottom of the lip seal seems about right. So theoretically underfill, or fill to 570cc and tolerate leaks?
Or find a way to have 570cc and no leaks.
Going for a brew!

6
Singles / Re: Gearbox oil leak
« on: 28 April, 2020, 15:35:13 »
Thanks for the replies. I have a bit more information from some notes I have found from when I looked at this a couple of years ago. According to the notes I have dug out of the garage I had previously concluded that the way to reduce leakage was too keep the oil just below lip seal level, approximately 12mm below the bottom of the filler port. This, according to my old notes, equates to around 370cc of oil ( which answers your question in an earlier post, Jim). When I get a minute I am going to drain and refill, just to confirm this number. Why I have revisited this is because the 370cc is well below the recommended volume of 570cc. I have been trying to work out whether it is possible to get 570cc to actually stay in the gearbox, as I have been concerned about the consequences of running with the reduced volume.
Apologies for late addition of this information.

7
Singles / Re: Gearbox oil leak
« on: 24 April, 2020, 15:48:26 »
Thanks for replies so far.
Jim - no clever measuring system. I just measured the height of the filler plug from the garage floor then went round to the other side of the bike, with clutch etc removed and measured heights of lip seal, splines bush etc. Then I compared the two. I finished off by removing the sprocket from the gearbox and let the oil drain out until level with the lip seal. This equates to 12mm below bottom edge of filler port. I don't know what volume this equates to.
Thanks Julian - I will consider that, have a look at the link you sent.
For information - Actual measurements are
Height from floor to bottom of filler port - 285mm ( note my centre stand is worn and the bike sits a bit low)
Height to bottom edge of lip seal housing - 266mm
Height to lowest point of seal lip - 273mm
Height to  low point of splines - 276mm
Height to bush on output shaft - 280mm
Done with a steel rule from a concrete floor, but fairly accurate.

8
Singles / Gearbox oil leak
« on: 24 April, 2020, 10:49:27 »
In the current lockdown I decided to revisit my gearbox oil leak. I pulled the clutch etc off and the final drive sprocket, exposing the gearbox. By measurement at both sides of the box I have found that when I fill the gearbox (B & M group plunger 1938-63 on the Draganfly website) to the bottom edge of the filler port, the oil level is:
12 mm above the lip seal where it sits on the drive sprocket
9mm above the splines between the sprocket and the output gear
5mm above the bush between the mainshaft and sleeve gear (items 97 and 98 on the dragonfly parts list/diagram). The bush, item 103 seems a good fit.
I filled the gearbox to the bottom of the filler port then sat and watched. Cold oil, Duckams 20-50, seeped out of the splines at the sprocket and from the bush/shaft interface
Slipping the sprocket into place and nipping the nut up seemed to sort the splines seepage. I expect it might seep thin hot oil, but hopefully not to any great messy extent ( or am I wrong?)
Currently I'm thinking my biggest leak is from the bush area, which is predictable as there has to be some clearance there and hot oil will find it. My question (eventually) is whether the felt and cork  sealing rings which sit in that area when the bike is assembled actually prevent leakage, or  is the leak inevitable? It seems a pretty crude seal system given that it sits flooded when the gearbox is properly filled. Am I missing a  trick somewhere? I can  run the bike with 10 mm less  oil in the gearbox as I only do short cafe runs at present, but I would like to achieve better than that.
Any advice welcome as this is a major pain as I don't like to park up and drip oil around the place.
Thanks.

9
Singles / Ammeter reading
« on: 13 April, 2019, 12:58:48 »
Just fitted new battery and Dvr2 regulator to my 1954 B31. All seems OK apart from the ammeter reading which flutters around zero until I've ridden a few hundred yards or revved the bike for a while on the stand. It then settles down and shows a steady charge. Once it settles down it stays good. It was doing this on the previous regulator. Is my dynamo misbehaving?

10
Singles / Re: Voltage Regulator
« on: 28 October, 2018, 22:56:43 »
Dynamo

11
Singles / Re: Voltage Regulator
« on: 26 October, 2018, 22:57:42 »
Thanks for information. DVR ahead on votes, although the VReg2 also looks good. It will be one of the two.

12
Singles / Voltage Regulator
« on: 22 October, 2018, 17:55:52 »
Last week I found my battery flat (B31 with Thorspark ignition).When I tried to charge it the charger declared the battery failed and cut out. The battery is 2yrs old and has a less than ideal time, having been charged, left to go flat , charged etc. The bike has a fairly cheap voltage regulator fitted in place of the old electro-mechanical original. Before I get another battery I am interested to hear views on cheap vs pricey solid state regulators. Are there any I should avoid, any which are generally recognised as being best?
Having fitted electronic ignition I am keen to have a good battery. And yes, I'm wondering about having the magneto overhauled to avoid all this. But it's more money!
Thanks.

13
Singles / Re: how to balance bike wheels
« on: 06 September, 2018, 22:42:36 »
That's a neat looking solution Royc. Nice find!

15
Singles / Re: how to balance bike wheels
« on: 31 August, 2018, 19:38:40 »
Wrap heavy solder wire round spoke?

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