So far I found wildly differing opinion and recommendations on bottom end rebuild schedule for x30.
I understand this can be very dependent on level of abuse, oil mixture and general running condition.
I am a recreational club racer and I am not squeezing the max performance out of engine as it diminishing return to abuse the engine at my skill level.
Seen as low as 20hrs and as high as 50hrs on bottome end service. Two different service centers gave me wildly different opinions on this and quick google search has it all over the boards. One place said must do at 20hrs other place said keep running it and fit pistons as needed just check rod and condition of lower roller bearing and dont worry about it until 50hrs. You can see me confusion.
I typically do my own top end service as it pretty simple with a bore gauge and send out cyclinder for quick hone/clean up at machine shop. I can understand doing piston pretty regularly and religiously at about 8-10 hrs as parts cheapish and easy to do to avoid a piston failure.
I have to outsource the bottom end service as I am not committed to spending money on tooling to do it …yet…