diary @ telent

S is for Stocks#

Sat Mar 29 19:28:02 2025

Topics: ride-report motorbike

Wooden stocks, on a village green with a hedge behind S is for Stocks. Although there have been stocks in Roydon since "date uncertain", they have been substantially rebuilt since that time and perhaps even more than once. "Most recently in 2016" according to the Parish Council web site.

I'm assuming they don't still see use, but that does make one wonder why they keep rebuilding them. Maybe it's to attract motorcyclists to the village to take pictures. Anyway I was careful to stick to the speed limit lest I end up in them

Rectangular wooden structure of maybe 1.5m high, with padlocked  double doors and some slats above to allow air circulation Next to the stocks is the village lockup, which looks like a small wooden shed. Apparently this is where in former times criminals were held until they could be brought before the magistrate.

It looks very low to the ground. Perhaps they expected to lock up only short people, or just didn't see why the detainee should be able to stand up.

Inside the shed. Unclear I did try for a photo of the inside, but I don't really know what I'm looking at here. Its possible that the low height is because it was partly set into the ground, but its equally as possible that the floor has rotted away and been removed

Who needs a satnav anyway?#

Sat Mar 29 20:03:55 2025

Topics: gear motorbike

I am experimenting with running Kurviger on one of my (several) old Android phones as a dedicated "satnav" for the bike, but tbh am not sure it's worth it.

Minerva/Specsavers custom-moulded earplugs#

Tue Apr 1 20:14:00 2025

Topics: motorbike

two custom-fit earplugs in a "clamshell" plastic case "What big ears you have"

My custom-moulded earplugs are here! I was not allowed to simply go and collect them, I had to make an appointment with the audiologist to have them handed over. (The appointment consisted of them being handed over, and me putting them in my ears: presumably it would have been more involved if I hadn't succeeded in that act)

Red is right ear, blue is left ear and you can see they're both a lot fatter than the off-the-shelf Pinlock earplug I put in there for comparison - which might explain why I was not getting a whole lot of volume reduction from the Pinlocks. Texture is "slightly squishy", I guess they're made of some kind of silicone compound.

They came with a soft case and the hard case pictured. Both cases are far too large for the purpose, but the plugs are a little too girthy to fit in the small metal keyring tube that I've been keeping the Pinlocks in. Not that I'm complaining about the size when it's a consequence of them being big enough to fit my ears, you understand.

I put them in for ten minutes to ride home and they do noticeably attenuate the sound, but I didn't get to more than about 45mph so I don't yet know how good they are at motorway speed.

The visible branding is Specsavers, but they're actually made by Minerva

T is for Train#

Sat Apr 5 18:19:02 2025

Topics: ride-report motorbike

T is for Train. This bright yellow engine was used in the London Underground works at Acton as a shunter to push dead trains up and down the hill. It's made of two Piccadilly Line locomotives welded together (and a number of "bits box" parts making it a quite unusual artifact) and now lives at the Epping Signalling Museum

I don't have any photos of the inside, but I got shown all around it and had the controls explained. About a third of it by volume is given over to giant high current resistors: line voltage on the tube is (was) 650v and if you want to travel at less than full power ... that power has to go somewhere. I'm told that they glow red when in use

This is the view from one end: in the middle at the bottom you can see two sets of couplers so that it could be used with both tube and surface trains. The door was welded shut so that the driver was not tempted to open it/lean out/fall out while attaching to the train, then a glass pane set into it so that he could still see what he was doing.

The other end looks more like a normal tube train cab (and the door opens), although still painted bright yellow.

The rest of the museum is in the adjacent former signal cabin, including this restored signal frame with 47 levers. Epping was complicated to signal as it had passenger trains and also goods steam trains (longer stopping distances) for the brick works and gas works which also used to be here.

Under the desk, the levers are linked to very hefty sliding metal rods with cutouts and dogs and things that provide mechanical interlocks preventing the operator from e.g. setting a green signal for two trains that would merge onto the same section of track and colliding. It's a hardware state machine. The levers eventually operate relays which operate pneumatic switches that operate signals or throw points using compressed air.

A signal frame seen from underneath. Some of the bits go side to to side when the levers are thrown, and this causes other bits to be prevented from going side to side. I think. Boolean logic in hardware.

"Fishbowl" relay in cubic glass walled case Ranks of relays There at least three generations of relay design exhibited. The oldest ones ("fishbowl" relays) are ~ 100 years old and others like them are still running on some railways in India.

The "train sequencer" machine is a mechanical paper tape reader that knew which train should be where (separate decks for weekdays and Saturday services). Left hand columns were timecode and right hand columns were for the train number. It operated ... relays. There are a lot of relays.

Anyway, if it wasn't already obvious I found the whole thing fascinating and a great way to spend 90 minutes.

It was however only 10 miles from home, so not a whole lot to say about the motorcycle trip there. I am attempting to build a habit of doing shoulder checks whenever I move off (although I did as a result get uncomfortably close to rear-ending a police car the other day, which would have been incredibly embarrassing. There's a time and a place, I suppose)

https://www.eppingmuseum.com/

LED headlight swap#

Wed Apr 9 17:48:36 2025

Topics: motorbike

It is legal in the UK to retrofit LED bulbs(sic) into an existing motorcycle halogen headlamp fitting - provided that the beam pattern is correct and so on and so forth.

The MOT rules were changed in January 2021 to explicitly fail retrofit LED lights, and then again in March 2021 to not fail retrofit LED lights, but only for motorcycles and for cars that predate 1986. (You might notice that the MOT special notice which makes this explicit is withdrawn, but that's a normal process when special notices get subsumed into the next version of the manual itself)

Doing the swap turned out to be simpler than I anticipated. The pictures in the Haynes manual are grainy and unclear, but I've seen enough video guides of motorbike tasks to know that I hate watching them, so here's my attempt at documenting the process using words and pictures only.

[There are some images with no alt texts in this thread, because they're just showing what the body text is already describing]

an LED set into a black aluminium (I think)  mount, with two metal blade terminals sticking out of the other end of the mount. An adjacent ruler shows it is about 4.5cm long, or 5.5 including the terminals First, choose a compatible bulb. For a CBR600F of this era, that's H7 - and because there's a big rubber boot that fits over the back of the headlight, preferably a bulb without a huge great heatsink sticking out of its base, or any kind of separate transformer box. And as I want to be reasonably sure that the light is going where I want it and not straight into the the eyeballs of oncoming road users, it also needs to be a bulb whose light source is the same size and in the same place as the filament would be in a filament bulb ,otherwise it'll bounce off the reflector in the wrong places.

Philips Ultinon Access meets the dimensional criteria and as it's a reputable brand not an Ebay special I'm relying on it not to spray photons at the sky.

To get to the bulb: first, remove the grey plastic "armrest" thingy on each side: undo two bolts and then carefully manoeuvre and flex the three different bits of interlocking plastic that have prongs sticking into each other, until it comes away. I also slackened off the two bolts holding the front of the fuel tank so that I could lift it slightly.

The headlights are under the dash. The plug pulls off (no fancy release mechanism, just friction) and then the big rubber boot thing can also be pulled away.

Now unhook the hinged wire retaining clip and it swings open rightwards. These pictures show both closed and open states (although they are for different lights and taken on different days: my continuity supervisor is down the pub already)

Now the bulb should just come out. Don't get your fingers on the glass parts of a filament bulb, not if you're going to keep it.

Here is where I reached for the new bulb and realised that the base of the old one was apparently bigger. Turns out that the bulb plugs into an adapter thing, so we take the two parts apart by pulling them (again, no clips or catches just an interference fit) and push the new bulb into the adapter instead.

Reassembly is, to coin a phrase, the reverse of disassembly. Taking phonecam photos of a light source is probably pretty pointless - during daytime, likely doubly pointless - because of auto exposure, but I did it anyway. The dipped beam only turns one light on (this is normal) and the full beam seems to be very very bright, but maybe that's full beam doing what full beam does.

side by side "before and after" photos taken while sitting on the bike at night time with the lights on. The bike is pointed down a narrow alleyway and there is a wooden board faciing it about five meters away.  "after" is a whiter and (I think) more intense light but does seem to spread a bit higher A better test was conducted after night fell, but my phone decided to take the "before" and "after" photos with different exposure settings (and it's not even as dark in the first one) and I'm buggered if I'm replacing the old bulbs in the dark for a side-by-side comparison. If it looks brighter even though there's more ambient light, that's good right? (Science r us)

The cutoff does seem to be a bit higher with the LEDs - unless the angle is different and I'm looking at the kickup there (UK roads, we drive on the left). Looks like I'll have to measure that properly and maybe adjust it

Skidmarx rear hugger#

Mon Apr 14 16:38:11 2025

Topics: motorbike

view of the left hand side of the rear of a motorcle. A shiny black fibreglass mudguard has been added that covers half of the rear wheel.  The passenger footpeg has been removed to allow fitting I bought this Skidmarx rear hugger back in August but when I (perhaps foolishly) asked my insurer about it they said it would add £200 to my premium so I didn't fit it then. Fast forward to renewal time, at which time I told the insurer I had a hugger and crash bungs and braided brake lines (which I haven't even ordered yet but intend to) and it made all of about £3 difference to the renewal price, so yesterday I added this to the bike.

right hand side of the bike, taken from the rear looking forward. the rear brake hose is sticking out to the side instead of running straight ahead from caliper to pedal top of the wheel, shoing very marginal clearance between the tyre and the hugger it's almost rubbing on

Fitting was a little bit involved because I had to remove one of the rear footpegs which meant removing the rear fairing to get access to the nut it's attached with, but nothing particularly complicated. Having said that I'm a little disappointed, to be honest:

I'm having very little success with web searches for "P clip with long arm" or similar terms, but perhaps I could instead use some kind of adhesive-backed cable clip that sticks to the top of the hugger (something like https://www.startech.com/en-gb/cables/cbmcc3)

As for the clearance, I think I need to take it off again and see if I can enlarge the screw holes to give a bit more range for moving it about.

I read https://www.als-place.co.uk/hornet/how_to/hugger.php?page=0 before starting and it reminds me of the web sites of yesteryear. In a good way! Written by a human for humans (not an AI for SEO), not a forum post or a youtube video, describing something they've done so that others may benefit