Silicon in fuel is a new one to me...
If carbs and tank are cleaned out and its still running like crap, maybe you have to clean out the injectors (FI???), fuel rail and then change the plugs.
It doesnt make sense that they would use silicon to clean lines unless it was silicon abbrasive.....
You would probably have to clean and inspect everywhere where the fuel would have contact with.
If he filled up in the UK with that, then he should probably be writing to the garaage and his solicitor.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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