Winter Work on the SQ4

It's time to think about winter jobs on the SQ4. The W/NG is the go-to bike and with no chrome makes an ideal machine for the winter, so if I can resist the temptation to tinker with it I can get on with the SQ4 and still have a bike to ride. The SQ4 jobs are:

1. Fix the speedo and get the blurred dial replaced
2. Get a new slow-running screw for the Solex
3. Remove the indicators - I have decided to do this, because they look awful and because the indicators are regular tungsten bulbs and the load causes the LED headlamp to flash with the indicators. This is a bit disconcerting at night...
4. Upgrade the headlight again
5. Replace the front wheel bearings with sealed bearings
6. Replace the front inner tube which leaks slowly
7. Look at the brakes again as they bed in
8. Make a new tool roll
9. Fit a couple of transfers
10. Change the oil tank for the one with a good filler neck thread
11. Make a lower chain guard

I'll make a separate post for the chain guard. It's here.

But first, checking the bike over reveals that the horn doesn't work. A quick nose about with the multimeter reveals no supply at the horn, so we look at the 15A horn fuse. This is blown, and was probably too low for the horn so we will change it for a 20A. This works fine and consistently, so we will leave this for now. We'll also pull the indicator circuit fuse...

I've stripped out the headlight, in preparation for sending the speedo away, uprating the headlamp and removing the indicators.The speedo has gone to Russell at Chronometric Instrument Services for a clean, new springs and a new face:

And here it is, back again just over a week later:

Soundly packed with lots of bubble wrap

New face, all numbers in correct positions

Guarantee sticker on the back

New screws and nuts

Now we can put the headlamp shell back in place with new bolts:

This is the new headlight bulb and it's driver:

It's from CDRC, like some other bulbs I have bought and is their 5th Generation LED headlamp bulb shown here. Not cheap, especially as to fit it I needed an H4 reflector which I bought from Paul Goff as usual. It's the 7" Lucas reflector with a pilot bulb. The bulb is very nicely made - aluminium, powder coated black with nice elastomeric seals and good quality connectors. I've chosen a 6V bulb, so that I can keep the ignition & generating systems running at 6V.

The bulb fits into an adapter ring, which is provided with the bulb. This allows you to twist the bulb through 360 degrees, offering left, right or central dip:

Whilst the bulb looks quite long it appears to fit into the SSU700 shell quite nicely. The cable goes off to the driver box which I will mount in the bottom of the shell.

All done and back together:

One job that wasn't on the list was to fix the offside fork leg which sticks down over large bumps. I pulled it apart to find that it was actually sticking with maybe a third of its total stroke left unused, so now that I have eased some very tight new bushes I am looking for better behaviour from the front suspension! I checked the other leg while I had most of it apart, which moved freely.

Lucas SSU700 Side Lamp Holder

A few pictures of the SSU700 Side Lamp Holder I made early on in the SQ4 rebuild.

I've fixed a LED sidelamp in it, from Paul Goff.

The bulb holder slides under two grooves cast into the underslung sidelamp housing, and is stopped by the two ears formed on the sidelamp holder:

In case anyone is interested, the Lucas part number is 516597...

This is a real one, from AOMCC member Lee Mallabone's KH:

Headlamp almost there

So here are a few pictures of Christmas holiday activities. The chewed pilot light housing has been filled & built up around the front edge as a low-risk alternative to a welded repair - I figured I would rather try this approach and have to redo it than melt an original SSU700 headlamp housing with clumsy welding.

After going through the grits with the help of some knifing stopper the headlamp shell is now looking very smart.

I have ordered some W-clips; I have rubbed down the newly straightened rim and I will order a plating kit after the holidays.

Then I plan to plate all the screws and maybe the rim as well.

And hopefully there should be a Red Spot Ammeter in the post!

Parcels still wrapped - more electrics

Well, the eBay parcels are still under wraps. Christmas is coming and sometimes it isn't wise to buy too many present for other women, however much shiny paint & chrome they will have when they are finished!

So in the meantime, let's get on with the headlamp. We've got a nice original SSU700, no repro bits here!

The instrument panel looks like it is off a WD bike; it's in great nick but the ammeter is wrong - it's not the white face one with the ignition light that should grace a Square Four headlamp.

Also, there are some flaky bits. The edges of the pilot light aperture are rather ragged - it's an aluminium casting and I'm not sure how to repair it yet. Then there is the rim:

The picture is not too hot but it's bent and it looks like it has been thrown down the road. I'm going to see if I can straighten it before I give up and buy a new one.

Here's the inside of the switch panel from the inside. All right & proper, apart from the ammeter I mentioned before. A new one will have to wait though - the proper ones will be like hens teeth!

Lighting switch, cleaned up nicely.

Here's the pilot light mounting plate. It was missing, but I made this one from some photos & dimensions provided from the fantastic people on the AOMCC forum. It's designed to hold one of these in the underslung pilot lamp:

And here is the ammeter, with the steering damper knob lurking in the background. I'm going to tackle the rim and the headlamp fasteners with a Plug 'n' Plate chrome plating kit, and see how much of the original stuff I can save.

More later.