Yeah i should of said I have a 250 so 50 hrs is prety much standard for a 250 for a piston kit but a pain in the arse having to do valves just lucky that they are cheap but as far as dust goes that is not my problem i fit clean filter every time I ride even if it’s not that dirty and i youse the same method as I have on my wr450 and it’s never had it’s valves done only checked and were still in toleranc when it had a full rebuild for peace of mind at 240hrs.i say honda just has shit valves
