[bluedog]

The nock protection is based on ion current measurement technology. I do not know more about that, then that it needs the correct spark plugs to work.

But anyway, I don't suspect that too low octane fuel is the problem as long as you use 95octane labelled fuel. Even outside Europe, the difference should not be that great. It is more probable, that you have contaminated Fuel or Water in it or so. But even that should not be a Problem, as long as the Engine runs smoothly. It may just rise fuel consumption...

But if there is to much dirt or Sand in the tank, that could be a Problem, but I do not considder that very probable.

To check that, you would be forced to look at the fuel pump inlet. There is a strainer at the Inlet... But to get to it, you would be forced to take the pump out of the tank and for that, you'd have to drain the fuel and detach the fuel tank first.

So it is maybe easier to measure fuel pressure, which is done by mounting a pressure gauge intoto the fuel supply hose. Measure that near the engine. You need to know what pressure you get right at the engine, not near the feeding pump in or just outside the fuel tank.

But, I recommend to replace the spark plugs first, if not done yet. That's far easier.

Lunch time. More that afternoon.