An 18 seems so new. But if it has a bunch of hours maybe that's 5 years of wear.
I've come across master cylinders that don't improve with rebuild. The issue is an alloy bore and a sinusoidal lever push. The bore wears like an hourglass.
I bought a new mc for mine and all of a sudden after every other thing it came right.
I'd tried Chinese ones but weren't right. A new one out of Italy of all places was surprisingly cheap on evilBay.
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'07 EC300 GG
'14 TXT250 GG
'? 496 CPI Cheetah RZ/RGV hybrid
'22 765 Street Triple RS
'21 XTrainer
'69 Stinger T125 Suzuki
'23 TRS 250RR (it's a Trials thing)
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