First order of business on this bike is to sort out the keys. The ignition tumbler had been replaced at some point so didn't match the petrol cap or the seat lock. It was also gummed up with years of crap.
Equipment needed:
10mm socket to remove lock
1 medium JIS Screwdriver
1-2 spare locks (for wafers) and ball-bearings/springs that get lost on the floor
Cleaning solvent
DriGlide Spay
CRC contact Cleaner (for the electric parts)
Access the lock by removing the upper triple tree, and open the headlight to disconnect the wiring.
I pulled the ignition lock and a couple of screws and I had it apart. Once all the obvious bits have been pulled out, the tumbler comes out by pushing a brass spring-loaded tab in towards the centre, then the lock out towards the rider. The lock is a wafer type - it uses sliding wafers rather than pins so it's a lot simpler to re-key (and to pick). Take care though else you will have springs and wafers everywhere. The brass tab is on the same side as the wafers so keep it pointing upwards. A finger on the top as you remove the tumbler stops the wafers in place. There are you tube videos on wafer locks, but none I found with the brass tab. Hondas use circlips instead.
With the key inserted, all the wafers have to align to the body in order to turn. Pulling apart some spare ignition units I found wafers of the right size and swapped them in. Cleaned and sprayed the insides liberally with Dry Glide (Doesn't attract dirt like oil does), and job done.
The only tricky thing in re-assembly was the spring/ball bearing from a small catch. Fitting is not immediately obvious. The way to fit this is to insert the small metal piece without the spring or ball, Align the indent from the hole in the casing, then insert these both from the outside, Spring first. It's locked in place once the metal piece is pushed into position.
All together and looks and operates like new, but with the correct key. The back plastic part was hard and brittle and I broke 2 spares trying to disassemble. I ended giving up on the thought of a thorough clean - instead I flushed quantities of CRC Contact cleaner through the holes to clean up the electrics. Gave the connectors a clean and polish.
Finally, I made a replacement label for the back with the new key number.
Loverly