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@bq
Electric starts work by energising a solenoid which moves an electric motor so that its gear engages with a gear on the flywheel. If it "plays up" then one assumes that it partially or intermittently works. This is likely to be a dodgy solenoid or a dodgy motor, both of which are probably a fairly easy and cheap fix, assuming access is simple. The other thing that might fix it is lubricating the moving parts and cleaning up the electrical connections.