Italian motorcycle manufacturer Aprilia says MotoGP's recent rule changes have carried it in the wrong direction and made the championship less appealing to constructors.
Aprilia has not had a prototype presence in MotoGP's premier class since 2004 despite dominating the 250cc category with Jorge Lorenzo in both 2006 and 2007.
While it now has an affiliation as an engine supplier to several CRT teams, Aprilia's main focus remains World Superbikes, to which it returned as a constructor in 2009 and in which it has since won 14 races, taking the constructors' crown in 2010.
Aprilia's technical director Luigi Dall'Igna says several wrong decisions taken by MotoGP have served to make superbikes comparatively more attractive.
"There is no stability with the regulations: they [MotoGP] change everything every year and that's bad," Dall'Igna told Gazzetta dello Sport. "Also, we don't agree with the adoption of a standard ECU. We do our electronics in-house, so it's not a cost and its useful experience to improve our road bikes.
"I speak more as a fan than technician: it is MotoGP's wrong decisions that have made Superbikes more and more engaging."