They came in the mail fully oiled so no corrosion. They were also perfectly sealed in a plastic container. I had to adjust the valve clearances on my bike to 0.03mm inlet and 0.08mm outlet and they went down to 0.02mm. You should always buy probes that are thinner and thicker than you need, the average measurements in a set are more accurate than the largest and smallest. I can't tell you how insanely much I had to bend my arms and gauges just to get into the gap where the valves were in my engine and the 0.03mm bend was able to easily do a 270Β° - handle bend. wrinkles. After restarting the bike there were no valve clicks or compression leaks, absolutely perfect valve clearance adjustment. I highly recommend that you wash off the oil they get in and coat them yourself with a specially selected anti-corrosive, specialty WD40 if you have it, if not then regular WD40 will work too.
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