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I'd be inclined to check the previously mentioned air filter restriction (under seat inlet). For it to happen suddenly is unusual for an air filter to suddenly get clogged - but its pointing to that area as all 4 cylinders affected.Only other common part to all 4 cylinder (although obviously timed differently) is CDI - I don't know anything about the workings of those but maybe another forum member could advise if the CDI could affect all 4 cyclinders at once
Quote from: philward on January 23, 2021, 01:51:47 PMI'd be inclined to check the previously mentioned air filter restriction (under seat inlet). For it to happen suddenly is unusual for an air filter to suddenly get clogged - but its pointing to that area as all 4 cylinders affected.Only other common part to all 4 cylinder (although obviously timed differently) is CDI - I don't know anything about the workings of those but maybe another forum member could advise if the CDI could affect all 4 cyclinders at onceNo SOHC four (except CB650) came with CDI, they had points and condensers. Highly unlikely to be an ignition related fault on all 4 cylinders. As previously suggested the sudden occurrence points to restricted air intake or sticking choke flaps.This one has had one fitted previously.Sent from my POT-LX1 using Tapatalk