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I've now had my bike vanned over to my mate who is investigating the cause(s) of the misfire.
He's been in touch with his preliminary investigations and it seems the carbs require a service and ultra sonic cleaning. The carb set up is standard despite running an aftermarket air filter and Sil Moto carbon cans (now changed for standard 620i cans due to wear and tear of the Sils). The electrics are in something of a state apparently due to age ,the usual corrosion and various bodges. A load of the wiring and connectors have had to be replaced. The charging system was on its last legs and the master fuse nearly melted through .The CDI pick up connectors were breaking down and it now appears the one of the pick ups is causing an intermittent misfire on tickover so both will be replaced with Electrex replacements if they have them. That's all for now-will report his further findings as and when I get them.
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