At the end of the day a seal is seal and most probably manufactured by the same supplier and if it lasts more on one motorcycle compared to another then I doubt we should bluntly blame QC, as the same goes for tires, them being consumables as well, a pair of tires may last 10k on the KTM's where as the same would last twice as much on the Honda's, doesn't mean that the KTM's follow inferior QC norms, it's just a result of the state of tune which again as you've mentioned is Engineering, a look at the CR is the best indicator of state of tune.
Hence why a KTM 250 with a CR of 12.5:1 would have components wear down considerably sooner than a Honda 250 with a CR of 10.7:1, now a Kawasaki 250 with a CR of 11.6:1 would have better component life than both the aforementioned motorcycles but when you look close its because of the twin cylinder configuration putting two 125cc cylinders at 11.6:1 configuration translating to even distribution of load on internals plus considerably lesser blow translating to lesser internal crankcase pressure resulting to considerably longer seal life.
Now the less informed would say that the KTM is the least reliable option but knowing the facts like any economical question the answer would be, "It Depends!"
And what it depends upon is the owners priority.
Just saying, cause even the alloys cracking/bending is in fact attributed to improper use rather than component quality.



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