So, Yamaha have been caught swapping the defective valves in their engines for all riders....
Details are still emerging, no-one seems to be 100% clear on exactly when/how this has happened.
The best I can tell, the designs for the engine were supplied for homologation (along with a sample...
Just come across this on goggle news.
http://www.newsandstar.co.uk/news/millionaire-cumbrian-motorsport-boss-sentenced-over-texts-1.1053313?referrerPath=news
;)