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I would ring it and fresh gaskets at 15 hours and then a complete top-end before 40 hours.
I would adjust/check valves every 15 hours and do a leak down test at 30 hours just to be safe. On a 4 stroke, the leak down will tell you everything you need to know.
Fast novice vet MX if you like.
Air filter ever ride, oil and filter every other.
70 hours and i put rings in it and checked valves, sold it after 100+ hours and it was still running like a champ.
Surely the KX must be similar?
For your average joe/trail rider I would push it to 80-100 hours. The key is frequent oil changes and a clean air filter.
I wouldn't suggest this obviously... but freakin 15 hours? really?
She was still going strong when i did the top end at 285!
I feel like the guys doing extremely premature maintenance do it to tell everyone "ahh yeaah i gotta do a piston on my 450 every 15 hours" to give a fast or factory impression.. thats just me though
Good Luck!
My KTM 450 manual has 40 hours for the top end.
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