Wrist pin length

How critical is piston pin length. Does it have to nearly touch the circlips on both side of the pin or can it be a little shorter. I have a oem KX 250 piston and a spare wiseco pin which is about a 1/8th of a inch shorter than oem pins.

its supposed to fit perfectly between the circlips if i remember correctly. im pretty sure when i put in my second circlip there was no room between it, and the wrist pin

if there is room for the pin to move, it will. And eventually wear the pins bore, resulting in a loose wrist pin. Thats bad. Make sense?

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