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Messages - Calum

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1
Singles / Re: B31 (1954) - how to fit side stand?
« on: 16 June, 2022, 09:45:10 »
Quote from: idie on 15 June, 2022, 19:11:58
If you were to fit the centre stand the wrong way round you would be unable to fit the spring as the peg would now be on the wrong side.
Yep, good shout. I knew there was something obvious other than the lugs it sits against when lowered!

2
Singles / Re: B31 (1954) - how to fit side stand?
« on: 15 June, 2022, 19:06:59 »
Quote from: chrisb on 11 June, 2022, 20:16:35
Got the sidestand fitted but it interferes with the centre stand.  (Centre stand won't come down with sidestand up).   Is this normal or might I have got the 'wrong' sidestand for this bike?
Is the centre stand on the right way around? They aren't symmetrical (but probably wouldn't work very well the wrong way round!)
I think mine just catches the other sometimes, but I can't think in what situation (I.e. which one is up or down, or both)

3
The Star and Garter / Re: mudguard rolling tool
« on: 11 May, 2022, 19:55:06 »
It's a bead roller. Usually they have different dies to swap out for rolling in different shaped beads/ribs/joggles etc. I too have one, handy piece of kit if you're doing sheet work restoring cars etc.

4
Singles / Re: B31 smoking
« on: 30 April, 2022, 22:30:28 »
Just to report back that I've done a few runs out now and not had one puff of smoke since, so it was a nice easy fix in the end (and in fact didn't cost a penny other than my time!)

5
Singles / Re: 52 BSA B33 Gearbox
« on: 13 April, 2022, 23:20:31 »
As above, they are to set the end float of the selector shaft. I didn't require them in mine, nor were any removed before I fitted the new bushes (but the old bushes were heavily worn!). Simply put, you really want as little end float as you can get away with without it binding up when hot or even when the inner cover is tightened - with little to no end float all the motion imparted by the cams is used to move the forks and the selector dogs rather than moving the selector shaft. The excess endfloat on my selector shaft, coupled with a worn fork and groove caused 3rd gear to drop in and out of mesh - it's worth getting right!

6
The Star and Garter / Re: machining prices, whats the normal
« on: 08 February, 2022, 18:25:19 »
Going rate for labour in most machine shops is £40-50 per hour (ours was £40 at work but I believe it has just gone up this week) It's a different story if you can leave the machine and go do something else in the meantime, but if you need to be there at all times to operate it it's generally skilled work and you'll pay as such.

7
Which BSA do you ride? / Re: Bsa b31 history
« on: 02 January, 2022, 20:05:19 »
How long ago are we talking? I would think the only way would be through any club(s) or friends who knew them and the bike. I assume you know the registration mark?

8
Singles / Re: B31 smoking
« on: 02 January, 2022, 13:51:00 »
Bottom banjo removed and drilled to match the top. I managed to remove the bolt once I had loosened the three bolts that hold the front of the inner primary to the crankcase. This gave me just enough room to remove it. I might shorten the bolt slightly when I refit to enable the bolt to be removed in future without having to loosen the primary case again.
The small hole (same as my feed banjos) was around 3/64" but the large was 5/32", if not slightly larger, but I drilled the bottom one to 5/32" to 'match'. I measured them trying different drill bits in which I measured with a micrometer. I had to poke the drill down the main body of the banjo bolt too to open that up to 5/32" as well. I quickly cleaned up the 45 degree sealing faces on the lathe as they were quite stepped and rough feeling. Hopefully it's all sorted now!

9
Singles / Re: B31 smoking
« on: 31 December, 2021, 00:45:59 »
Quote from: Pete Gill on 30 December, 2021, 15:01:26
Well Calum at least you’ve found the problem. I must confess that I drilled out the apertures on all those bolts on my B31 as 1/64th seemed to me to be too easy to clog up with a bit of debris. I did open up the lower ones more so. I haven’t found it to flood with oil yet or smoke. If it does smoke more as time passes I’ll renew the rocker box ones, they are easy to get to.
Pete
I don't suppose it's likely to flood the top as long as the drain holes are considerably larger than the combined area of the supply banjo orifices. I'll remove the drain pipe and drill the bottom banjo out to match the top and see how we get on.

Quote from: cdsdorset on 30 December, 2021, 15:50:51
Have you had the head rebuilt. Sounds like wear on the valve guides. Oil in the head sucked into the engine down the side of the inlet valve.
Nope, never had the head off. There's no smoke on the overrun or going down long hills to speak of so I don't think the guides are too bad. I do have some jobs planned for the engine in the future but for now I am just enjoying riding it when I can. Once I finally build my new garage I suspect I will spend a lot more time tinkering...

10
Singles / Re: B31 smoking
« on: 30 December, 2021, 14:27:39 »
So I finally got around to having a look at this... two rocker feed banjos easily removed, correct small holes. Drain banjo on head is a large hole, drain banjo on crankcase seems to be the small one >:(. Annoyingly the only one that is hard to get to, and I don't think I can quite get to it without removing, or at least loosening, the primary chaincase. Typical! I not long had all the primary stripped when I rebuilt the gearbox, I suppose I should have checked then!

11
Singles / Re: Any Magneto magicians?
« on: 19 October, 2021, 21:52:24 »
Does the short go away if you back the centre bolt off ever so slightly? It screws into a nut which I believe is encased in plastic/resin to insulate it from the mag body. If this screw is overtightened I believe it can crack the plastic and short across. I only ask about backing it off slightly as a test as I found I had a similar issue on my mag, although with the locktab folded over it did run fine. I couldn't get my head around what was touching where.
I bought one of those timing lights but off someone else on eBay, a little cheaper than the one from 'the magneto guys' but both would be a worthy investment. Very helpful in my diagnosis work on my bike.

12
The Star and Garter / Re: Grease in gearboxes
« on: 18 October, 2021, 13:06:52 »
In an M20 gearbox the constant gears on the layshaft are fed oil from a drilling in the shaft itself, and hence the gears are lubricated from the inside. I wouldn't trust grease (semi-fluid or otherwise) to make this journey (I am pretty sure it is the layshaft rather than the mainshaft)

13
The Star and Garter / Re: Headlight underslung pilot
« on: 19 September, 2021, 14:21:35 »
Mine on my '53 B31 is just like the drawing from the manual above. It slides into the clips in the bowl, and the glass lens is held in from the inside by a spring wire pushing it up against the rubber seal.

14
Singles / Re: BSA M33 500 1955 Engine looses Power after 20 min
« on: 17 September, 2021, 20:19:00 »
Valves not closing properly when hot?

15
Singles / Re: B31/M20 Gearbox
« on: 17 September, 2021, 20:17:55 »
I rebuilt my plunger B31 box recently and I bought a box for spares (many for the good selector forks) but I did end up using a gear or two out of it. It was stamped M20 on the casing but came disassembled so I can't guarantee it was all correct. I'm pretty sure the gear ratios were identical.

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