Both bikes, shortly before the engine died, had a rumble in alternator area at strong lean angle to left. Soot in the exhaust when the engine starts. Jerks when driving at low-mid rpm on flat gas, interruptions with fuel supply to low-mid rpm.
The EBR had problems with cooling - liquid began to go away, I run without thermostats. Where she went - I never found. Engine did not smoke and oil level did not decrease. Z1000 consumed 1 liter oil per 1000 km. EBR had permanent problems with lambdas of both cylinders - I changed them six times in two years.
Sorry from bad english, it's hard for me to write such complex technical details...