ORIGINAL: RCIGN1
The piston SKIRT is at the bottom..Somebody tell me what the bottom of the piston has to do with the exhaust timing.....
The TOP of the exhaust port is what controls the exhaust timing...
Because if you drop the exhaust port too much, then the piston skirt will open the bottom of the exhaust port and expose it to the crankcase when the piston is at TDC. I know that you know this, but our discussion might not have been clear enough.
But, your right, it doesn't effect timing. It'll just screw up the engine.