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Topics - chrisgoodwin

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Singles / B31 chain case
« on: 23 May, 2018, 23:41:08 »
Hello again,
The B31 is ready for the road but I am having problems with sealing the primary chain case.
At present I have a cork gasket greased well and the chain case set screws nipped up tight but she leaks like a sieve.
Time to ask for advice on how best to seal the damn thing, back in the day it was red hermie but I suspect things have moved on.
There seems to be a myriad of silicon gasket goos on the market, can anybody suggest a good sealant?

Singles / The big boot
« on: 29 December, 2017, 01:20:46 »
Hi all,
Like the very similar post by Gusmagicbus, I am almost ready for the first boot.
A few questions if I may regarding a '53 B31.
Engine oil, I was thinking old school straight 40? (is it still available?)
Gearbox, again straight 90?
Finally, what spark plug would you recommend? I know the official Champion and NGK numbers, but I wondered if others experience told a different story.
As always, I would appreciate your advice.

Singles / B31 competition exhaust
« on: 26 November, 2017, 20:49:32 »
Good evening fellow Beezerists,
I am in the final stages of getting the old girl back on the road again, I'm afraid its another Bitsa, 1948 rigid M20 frame married to a 52 B31 - I prefer to call her an M31!

It's all original parts, but quite frankly I have never liked the look of the standard B31 exhaust system, and as it a hybrid and could never be compared with an original machine I have some leeway to experiment.

I really fancy the idea of a high level exhaust, but am not sure if the competition system will bolt straight on. I have average mechanical skills but no access to welding equipment.

My question is has anybody fitted a high level system to a rigid B31?  If so, any description and / or photo's of the mounting brackets would be really appreciated.
Thanks in advance,

Singles / B31 Manual Advance/retard
« on: 11 October, 2017, 15:48:11 »
Hi All,
I wonder if anyone can help with this question.
I have a Lucas MO1 Magneto with the advance/retard cable housing on the left hand side (Looking from the drive end) Right hand side (When looking at the points)

I think that this is a tight wire advance set up and the timing should be set with the cable slack (Retarded) and the lever operated to advance the timing for normal riding.
Please see attached pic, not my mag, but lifted from a flea bay page.

I'd appreciate it if someone can confirm it is a tight wire advance.


Singles / B31 Engine sprocket shims
« on: 17 September, 2017, 21:32:36 »
Hi all,
I need some advice (again) & I wonder if anyone out there can help.

I need to align the engine sprocket to the clutch chain wheel and I am looking for some suitable shims. I can see shim kits for an A7 and I suspect they would also fit the B31, searches for specific B31 aligning shims seems to draw a blank.

Does anyone know if the A7 shims would fit, or where I could obtain specific B31 shims.

I have a 4 lobe spring shock absorber and I think I need to move the sprocket out about 30 tho (ish)

Thanks in advance,

The Star and Garter / Lidl Tools
« on: 15 September, 2017, 12:09:58 »
Hi all,
I bought a compressor yesterday from lidl for 79 along with an air- gun and ratchet attachment

had a play with it in the workshop last night, and the air gun with various nozles is fantastic at blowing away all the bits of crud stuck in the hard to get to nooks and crannies, beats a tooth brush hands down.

The ratchet set is 1/2" drive and I think the max torque is 61 nm

Its 79, it only has a 25L tank and has a max pressure of 10 bar, but in my humble opinion for the average 'Shed bike builder' its a serious bit of kit.

Thought I'd share this as I suspect they will fly off the shelves.

Singles / B31 loose valve guide
« on: 31 August, 2017, 22:34:26 »
Hi all,
Head and barrel now stripped, the plan was a thorough clean and paint, but I have come across a problem, the exhaust valve guide was loose with about 1/8" play up & down.
I made a drift and knocked the guide out, after the initial play the guide was tight in the head.
When the valve was put in the guide it is "sticky" at the point where the valve would have been in its seat.
New valve and guide obviously required, but I am unsure what to do to make sure the problem does not reoccur.
New guide with Loctite and hope for the best? Can you buy oversize guides (I remember doing that to a Triumph years ago) or will the guide hole need reaming and a guide made to suit?
I'm a bit stuck on this one, and as ever any advice is really welcome.

Singles / Rigid b31 brake pedal spindle retaining nut
« on: 25 August, 2017, 13:25:39 »
Hi all,
I wonder if anyone can help out.
I am trying to source a stainless nut to fit the rear brake spindle, the outer nut that retains the foot pedal.
However, I cannot find the correct thread, I have twice ordered the wrong nuts and I now think I need a 9/16" x 20 TPI nut.
Can anyone confirm or correct me, if you pardon the pun, its driving me nuts!

The Star and Garter / B31 Valve seats - lead free
« on: 13 August, 2017, 23:57:09 »
Sorry Folks, I can imagine the rolling of the eyes and the cries of "Not this one again!"

The rebuild (Rigid B31) is going really well, can't take much more apart before I will have to start bolting things back together for a change.

Head and barrel off, today the Gods smiled and the dreaded push rod gland and shock absorber retaining nut 'gave' without drama. All hail to E-bay, C spanner worked a treat.

Finally to the question! What is the feeling regarding hardened valve seats, I have read so much, I have decided to give up reading.

There seems to be three schools of thought,

1. Do nothing and fill up as and when required.
2. Fit hardened valve seats
3. Use an additive

I estimate my annual mileage to be fairly low at 4 - 5K PA, weekend tootle of say 50 miles and weather permitting the occasional summer run to the office and back -60 miles and with the seventeen horses on tap, maybe a speed of 50-60  MPH?

In my defence, I left the UK to work abroad ages ago and did not follow the no doubt legion of advice on this subject at that time.

As always, your comments / advice are really welcome.


The Star and Garter / Nuts!
« on: 29 July, 2017, 22:53:10 »
Hi all, I wonder if anyone can give advice on this one.
I am looking for some generic nuts and bolts to keep in my squirrel store to use as the rigid m20 proceeds, there seems to be a myriad of assortments out there and I am confused.
Has anyone recently bought an assortment of nuts and bolts recently?

Singles / M21 Girder Forks (Links)
« on: 19 July, 2017, 22:12:58 »
Hi all,
When I took the forks apart, on both the top and bottom links, I would have thought there would have been a washer between the link and the fork bushes.
There is obvious signs of wear around the bearing surfaces.
All the parts lists I have or have seen do not seem to show a washer between the link and fork bushes.
Should there be a washer, or am I just being thick?

Singles / B31 Rigid rear stand - frame lug
« on: 10 July, 2017, 23:19:41 »
Hello all,
Another request for help. The strip down is complete, I bought a basket case 25 years ago and in 6 weeks I have converted my old beezer back into a basket case!
Yesterday I gave the rear half of the frame a decent licking of nitromors and a thorough power wash, tonight 90 mins with a wire brush in the 'lecky drill has it down to bare metal.
I never had a rear stand on the bike and I suspect the frame lug that retains the spring was ground off in some previous attempt to 'modernise' the bike.
As the rear loop is now down to bare metal now's the time to get any welding done.
So, what I am trying to work out is A/ what the lug looks like and B/ where is it located on the frame?
I'd really appreciate it if someone out there could provide a picture of the stand spring retaining lug in situ that gives enough detail of what and where needs welding

Anyone got a rear stand for a rigid B31 for sale?

The Star and Garter / Painting rims.
« on: 25 June, 2017, 21:33:05 »
Hi all, some more advice needed I'm afraid.
The B31 strip down is going well, most of the tin ware is now either painted, primed or filled and my thoughts are turning to the frame and wheels.
The frame I am going to use Tekaloid (brushed) - I make no apologies, I'm old school.
But the wheels!
The wheels are sound, galvanised spokes are fine, but the chrome is shot, I was thinking if it was possible to paint the rims while the wheel is still spoked.
It would be a short(ish) term solution, but if I can get a couple of seasons use I can defer the cost of rebuilding the wheels and allow me time to make a reasoned choice - painted, Ally, Stainless or chrome.
Has anybody painted their rims  that gave a decent finish?
I have seen so many paints on sale these days, can anyone recommend a paint that would last 18 months or so?

Singles / B31 Primary drive
« on: 15 June, 2017, 23:13:21 »
Hi all, more advice desperately needed!
I am into the primary chaincase, the strip down going well, clutch removed and them I noticed the primary chain has been wearing the main bearing housing extrusion. Please see photo.
My initial thoughts.
-Is the sprocket too small? It has 16 teeth, I presume more teeth would give a bigger diameter and thus more clearance.
-Is the primary chain wrong and had a chain fitted that's too wide?
-Or maybe the problem is the sprocket does not have enough shims behind it to give clearance?
-The corks on the clutch basket are just about non existent - would this have an effect?

And finally, any tips on removing the shock absorber nut, I am hoping a C spanner will tackle the job, but it looks like it has had a fair bit of hammer in the past. Is it a left hand thread? I seem to think there is a 'lefty' associated with the 'bottom end' somewhere.

Once again, many thanks for any advice.

PS, Just down loaded the photo from my phone and almost cr****d myself. I thought there was a crack in the cases and after a frantic run back to the shed the crack turned out to be a piece of cotton from a rag!

Singles / Rigid B31 Battery Carrier - Missing parts
« on: 11 June, 2017, 21:33:27 »
Hi all,
I wonder if anyone can help in identifying the missing parts to my battery carrier. (Please see attached)
What I am trying to find is the actual battery strapping that presumably fits the rectangular holes at the top to the holes at the front face of the bottom.
I've looked that all the parts lists I can find so far to no avail.
As always, any info / advice is really welcome.

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