In Superbikes Ryuichi Kiyonari and Josh Brookes of the Louth-based HM Plant Honda saw their title hopes dented as they finished both races outside the top three.
In April Ryuichi Koike, Japan's best-known sokaiya, was sentenced to nine months in prison and he might have got several years more if he had been prosecuted under new laws.
Defending champion Ryuichi Kiyonari, Jonathan Rea and Gregorio Lavilla have all left the championship but Laverty faces stiff competition from the likes of Shane Byrne, Tom Sykes, Leon Camier, Leon Haslam and Cal Crutchlow.