Same thing happened on my '18 XC250. Felt front brake get weaker, thought it was air in the system(disc had lateral movement). Turns out 5 out of 6 front rotor bolts were loose. Loctited front & back & no probs since.
In 138 hours I've also nearly lost a pipe mount bolt(sitting on cases unbelievably), lost a rear spoke, just recently lost a chain guide bolt & a loose plug. Mostly my fault TBH.
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'18 Gasgas XC250
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