Ok I will recheck the rings, it's possible I put two 'keystone' rings into one piston, meaning that both other rings don't fit in the top groove of the other piston. I tried for around an hour last night putting the wristpins in, I can put in the second circlip but it doesn't seat into its groove - the pin is just two long! Trust my luck to find out all of the minor changes Honda have made along the way It could be the pins are suited to pistons from a later model, so I might just have to order another set of pistons from Tyga
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'87 MC16