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50/50 Acetone and Automatic transmission fluid.. Pour some in and top up untill it stops leaking past the rings.
Once the level stays constant the rings have popped back out and pretty much all the gaps filled with oil.
The acetone loosens and eventually melts the gunge in the ring grooves and the oil is loose enough and carried with the acetone to lubricate.
This is a bit of a cheapo plus gas mix, just a bit more aggressive.
Best is to get the pistons out then clean the grooves, scotch-brite works well as it isn't too abrasive. The rigs do get more brittle with age but I'd guess would be OK.
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"The final measure of any rider's skill is the inverse ratio of his preferred Traveling Speed to the number of bad scars on his body." Song of the sausage creature
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