Nailed it. And in order for the insurers to deny a claim or coverage, the fact that the tire had been repaired would have to be the proximate cause of the loss.
Well yes, that is what we are talking about.
To what extent police accident investigators and insurance assessors take an interest in a road accident may depend on the seriousness of the incident.
But if you have say, for example, lost control of your bike, and a third party is injured as a result, then you are probably looking at a full accident investigation. In the UK when people are injured on the road the police want to know why. Insurance companies can access those reports and they can carry out their own assessment of your vehicle if they wish.
I suspect police and insurance assessors are more than smart enough to figure out the cause of accidents, say down to it being a failed puncture repair, what type of puncture repair has failed and why it has failed. I don’t buy the idea that they won’t be able to tell a fresh temporary repair from an old one pressed into daily use etc. Then there's the fact that you should have been riding slowly in limp home mode - you know in case your temporary repair turns out to be just that, temporary.
Using the logic that ANY modification to the motorcycle could be used to deny coverage, you'd better not have changed any suspension components, bars, brakes, etc, etc. "How long ago did you replace the brake fluid? Was that done by a BMW certified technician? You have the documentation, of course..."
No that’s nonsense. Firstly, you should declare any modifications to your insurance company, it is reasonable that they know what they are insuring. However, my understanding is that, generally unnotified modifications would had to have contributed to the incident for say third party cover to be withdrawn.
But if you have decided to ignore legal guidance, manufactures recommendations and in the UK BS AU 159 and run long term with a repair sold to you as a get you home fix, then yes if it subsequently fails and you have an accident, then you may find yourself on your own.
I’ve not heard of BS AU 159 repairs failing. But if it does and you have an accident as a result you are covered.