Whiiir.CLICK. ok we'll get to that later.
Ahh Wob, you have a way with words that makes me laugh. . usually at myself.
I'd only changed to Castrol R30 in an attempt to get better ring sealing. I thought the old bean oils were supposed to have surprisingly good film strength esp when hot (& teh bike was air cooled not that long ago).
anyways..since it has a full reed conversion I trimmed the back of the piston from 56mm to 48 as it stuck down in the way at BDC. I'd noted the old aircoold YZs had most of the piston back missing and the KT100 .skirt was reasonably long and parralel. A few pages back you indicated that the most flow isn't happening at BDC. Perhaps I should go back to full length skirts (except on saturday nights when its dark).
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