CB750 K2 Misfire

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CB750 K2 Misfire

Howard
I've been struggling with this problem for sometime.
I've changed the points, condensers, coils, HT leads, plugs, caps and associated wiring.
Had it running nicely for a few miles and then the misfire returns.
At present one set of points is sparking badly which suggests the condenser is faulty which I have only just  renewed.
Also the middle set of plugs are burning out which adds to the misfire.
The problem is probably simple but its driving me crazy.
Anyone come across this.
Also as 4 star petrol is now unavailable what is the best solution to run tne engine on 95 octane.
Really appreciate any assistance