The speedo used on the 1969 Ct90 k1 speedometer is a one-year-only version with a distinctive triangular shape. My bike was fitted with a later version - the different speedos used on the CT90 range are shown below.

left: pre-1969 version / centre: K1 1969 / right: later version (note sticker explaining how to use the handlebar lock used on the K2 and later CT90s)

Although almost identical to the K1 model, the first replacement (below) I aqcuired is actually from a S90 of the same era. The giveaway differences are the oblong shaped warning lights and the orange gear change indicator marks on the speedo face (these go up to 65mph on the S90 - to reflect the sportier version of the engine - compared to the CT which has a 57mph theoretical top speed for a CT).

the initial S90 speedo, prior to repairs.

I did eventually manage to find a genuine CT90 k1 version - before and after below:

genuine CT90 K1 speedometer (before and after repairs and clean up - I switched the internal mechanism over from another speedo as the original was rusted solid)

In what appear to be common faults, the white surround on both speedos was tarnished with rust and the coloured plastic lenses were missing. Perhaps unsurprisingly, some of the bulbs and bulb holders were missing too. The repairs are described below.

This is the speedo and headset received with the bike:

The fork covers, headlight, headlight case and speedometer are all wrong for a K1 (the handlebars, handlebar clamps and fork bridge plate are all correct though)

Replacement Bulbs

I didn't really want to dismantle the speedo to fix the missing coloured lenses, having messed up this job in the past on another bike, so instead I considered using colored LED as an alternative. I gave up on this idea for a couple of reasons: the first is I ordered the wrong LEDs (I assumed they were 9mm but they are actually all 7mm). As it happens the shop I got the bulbs from - LED Bulbs for Classic Cars (Ebay) - does do BA7S LED bulbs but they do not stock amber versions. The very helpful people who work there answered my query about why:

Amber as a BA9S/BA7S fitting in LED is not that bright. The head needs to be a lot larger to get enough SMD's on it to give a bright output. Where you have an amber lens, we recommend the use of warm white LEDs, a similar colour output to incandescent lamps so will work well behind an amber lens. Cool white would just wash the colour out.

6v BA7S bulbs are still available in the UK from Lucas

The second reason is I decided it would look a bit crap without lenses.

Repairs

... so I bit the bullet and unpicked the outer cover so I could glue in some coloured perspex. There is not much to know, just be patient when removing the metal trim from the base.

Much to my surprise the original amber and green oblong lenses were stuck to the inside of the S90 speedo!

There is no real art to removing the stainless steel trim, just go slowly and go round several times prying the lip up a small amount each time. You need to go equally slowly when folding it back into place.

I used a bit of red perspex to replace the small high-beam indicator (in the olden days Honda used red for high beam, switching to blue at some point in the 70s). I glued all the lenses onto the back of the speedo face with epoxy. It was also a good opportunity to clean the white surround.

For the Genuine CT speedo repairs, all the lenses were gone so I scavenged the lenses from the incorrectly sized LED lamps I bought earlier.

Although It is possible to reset the clock back to 000000, it is a semi-destructive process as you have to cut of the folded over tabs that hold the drum in place.

Rear connections

Here are the light bulb is the rear connections

Note that the brown (rear light) and blue (high beam) are grounded through he case. The orange/blue (signal indicator) and light blue/red and black (neutral) are isolated from the speedo case (if you are intrigued about the wiring, read more here). Don't forget to clean up the inside of the bulb holders so there is a solid ground connection to the bulb.

Fork covers

As noted above, the K1 came with a smaller headlight than subsequent models, and as a result the fork covers are also a different design with smaller fork 'ears':

I managed to get the correct fork covers from a red CT90 that was being broken for parts in the UK (although I noticed later you can still get them NOS from David Silvers). The Headlight bucket is still available, but not in the CT90K1 red colour. The smaller headlights were used on a number of small Hondas in the UK and are not difficult to find on ebay.

The only other thing old rubber gasket fell apart immediately - I had to order a replacement from Thailand. Here is the finished job