I visited the Guzzi Doctor’s shop this morning to grab a few things. I’ve been toying around with using the aftermarket ignition switch I bought since the bike didn’t come with the key.
The new switch doesn’t fit the original bezel and to use it would take more effort than I’m willing to go through right now. I picked up a lathe earlier this year but still acquiring tooling.
So we searched through the box of keys and switches and found the correct series key that fit in the ignition switch. It didn’t turn, but at least it was a start.
I got back to the house and pulled apart the ignition switch, taking care not to launch any springs or tumblers. I marked one of the tabs near the 30-30 terminal with a punch so I can ensure proper reassembly.
Pry open the 3 tabs and remove the plastic end cap.
Remove pressure plate and spring. Indexing plate comes off next exposing 3 ball bearings.
The lock mechanism housing has a retaining ring and the aluminum body is crimped over it. I pried one section with a screwdriver and was able to get this out. We will need to be sure to re-crimp when assembling. This was the PITA part of the job.
Once I got down to the core lock mechanism, you can see that when the key is inserted the tumblers are not level with the surface of the barrel.
Since I’m trying to match an already cut key, I swapped around a couple of the tumblers to get it close, and then ended up grinding down the top and bottom surface of the two middle tumblers.
The top of the tumblers affects if the lock turns in the barrel, and the bottom of the tumblers may need to be adjusted as well or the key will not go into the switch all the way when assembled.
Now that I have a good working ignition switch AND a key that works, I’ll zinc plate the housing tomorrow and paint or powder the cover.
Speaking of the cover, to remove the old trashed rubber bits, all you have to do is pry up on the metal disc, work your way around a couple times and eventually it will come off the post.
The surface is pretty rough so it will need to be blasted and maybe touched up a bit if the pitting is deep.
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DO THE TON