When I mentioned my 2008 GRiSO 8V tappet issues and roller conversion to a friend with a KTM 990 he replied:
" Wow.. that's so KTM 990 !. The flat tappets in my bike have exactly the same problem (the coating chips off and wears the cams away). KTM's fix in the version 2 LC8 engine (1190, 1190, 1290) was.....
roller rockers !
No happy ending for my bike unfortunately. I have to pull the engine out and inspect them every 15-30k because there's no retrofit roller kit for my 990 engine!
Most owners as soon as they get news of this, they sell their bike. I'm one of a few that are happy to deal with it."
Have you seen the DRAMA inspecting and/or replacing the KTM tappets compared to the sheer *ease* of the GRiSO 8V engine ... it's days/weeks instead of a few hours.