I have acquired a TS250/1 which has been fitted with a 12v Boyer Bransden ignition set up. It has a good spark and starts up OK. The battery is fully charged and easily passes the ‘test’ of having the headlight on full beam for a minute without dimming (without the engine running, of course) – it will also operate the winkers normally, a good strong hooter and stop light at the same time. However, when the engine is running the ammeter shows a maximum charge and the charging light never goes out. On top of that, when I last fired it up the tickover was extremely fast – whereas previously it had been normal – and the engine would not turn off no matter where I positioned the switch. The carb. is a Mikuni which has been recently ultrasonically cleaned. Does anyone have any ideas what could be wrong? Has anyone a BB wiring diagram so I can check if it’s been wired up correctly? Would anyone like to make me an offer for the wretched thing?! I’d appreciate any suggestions. many thanks.