1) The (new) top ring on one of my pistons does not move smoothly in its gap, it gets caught and doesn't move all the way into the groove. Seems to be the piston - even the old rings don't fit back in!
2) The wristpins sent to me by Tyga are around 2 or 3 mm longer than the ones that were in there when I took the engine apart, meaning that I can't fit the pin between the two circlips. The new pins are 13111-KV3-7771.
The local wrecker, who seems to be a bit of a 2-stroke fan, told me the cylinder heads I have are from some in-between MC16-MC18 model, as they do not have a 'flat' at the top...I'm getting confused so any help would be great.
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'87 MC16