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It all depends on your riding.racers change 25hrs or so.I ride every other week end 3-4 hrs,its giong on 3yrs since last top end.Buy compression tester 170psi needs top end,my compression 220.KTMs piston are forged like wisco,But Austria quality.Usually bike has lost power,runs but not as peppy ,depending on compression. tbiker67@Yahoo.com

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Q: How often change top end on KTM 250SX?
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