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Old April 28th, 2019, 05:19 PM   #12
DannoXYZ
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Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011

Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C

Posts: A lot.
MOTY - 2018, MOTM - Nov '17
Use something with better anti-corrosion abilities than brake-cleaner (which just dissolves light oil). PB-Blaster will remove rust and corrosion from piston. Squirt some in there and piston will move freely after soaking overnight.

When I managed bike-shop during university, we had lots of bikes come in with stuck seatposts. They'd be mangled and scared-up from endless twisting trying to free them up. We would just spray PB-blaster on them and let sit overnight. By next morning, 1/2 of them would have seats completely lowered by themselves after the PB-Blaster dissolved corrosion from seatpost.
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