Hi all, I need to know how sensitive the piston rings / rod lower pin or other parts are for wear / fatigue failure under medium load conditions. (I ride in flat woods (Enduro), not on cross-tracks) Yamaha Manuals require every 5th race or 1000 km (?) or .... ? before preventive replacement. I doubt if this is a reasonable margin. It does not differentiate between loading conditions. What do you think, What should it be under medium conditions. Is 10.000 km Feasible? Anyone experience with WR400F running much more hours without failure? Thanks for your info!