Crunching some numbers now to determine correct ring end gap. Mostly for reference for myself. Working off the 66.4mm bore and using wiseco's calc bore x .004" top, and x .005" bottom.
Top ring: 0.27mm
Bottom: 0.33mm
As delivered the stock S3 rings measured in with gaps as follows (measured about an inch in the cylinder top, pushed down with the piston)
0.25mm and 0.28mm
The S3 piston is stamped A 66.33 S3 Vertex. Piston to bore clearance will not be measured as I don't have the tools to do so accurately, however dropping the piston into the cylinder it will slide in easily under its own weight. There is no notable play side to side.
Reminder to self, rings are installed with the marked side facing up.
I'll wait for a few opinions before making any adjustments. At this point planning on keeping the 0.28mm ring as the top, and opening the other to 0.33m for the bottom. Does anyone feel these are too tight and should be opened up a bit more?
Piston
Clearance
