Honda-SOHC

Seeing those David  reminded me of when a locking wheel nut on amy old Carlton stripped out.
At the time circa 1990 I ended up using a cold chisel to eventually get the nut to free off.

Looks like an opportunity. On their website they only list a system  for cb500. Presumably no good for a 550 k1 ?

Update:  I ended up going back to the USA before continuing with this "project."  While there I came across a complete points plate/advance unit in a garage sale for 10 USD!  I checked the condensers  with a real capacitor tester (not a multimeter) and they show good as far as capacitance and voltage.  Points are original ND and look essentially unused.

Now I'm back in the UK eyeing these parts wondering whether I REALLY want to install the OEM system or just leave the perfectly functioning DSS EI in place.  Logic/common sense would dictate leaving the EI; but I have this NON-common sense urge to have the points in there...

I haven't awakened the 400 yet from it's winter slumber - been too cold/wet for me but hope to do that sometime this week.  It's probably not often that someone has a perfectly running machine and intentionally changes something that may make it less so and I can't think of any operational advantage that the points would provide!   Yes, they will provide a spark with less voltage than EI but I haven't seen any case with my 400 where low voltage is an issue.     So more thinking...

Always stagger Ash, I like a good stagger 😂😂😂

Done