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I said talk, not do ;)
Have a few stories of enlarging the ports for moar power and destroying cylinders.
Would getting bits from the EU be any cheaper?
Orings are orings, as long as you have the right material then diameter and size. You can shorten bigger o rings to size.
Thought most bearings in two strokes are usually standard iso sizes. Or just wander to the machine shop and they have the parts. Different country I suppose and 2 stroke bikes are far more common.
lynx
You mean dremel the ports to increase in-out flow?
I was told about using a needle file to smooth the sharp edge of the ports to speed up the flow.