Alright well the end gap could be the problem I put them on exactly how the manual said being as careful as I could to not stretch them. I don't have the head matched but I was running two base gaskets which tazland said should have zero issues.
1. The ring end gap is measured by placing the rings into the cylinder and using the piston to push them down squarely in the bore. Measuring the gap as they sit on your coffee table is of no value...
2. Using 2 base gaskets but an unmodified head may not produce "zero issues". You still have to check compression and be sure the piston isn't kissing the head at TDC.
Wheelman-111
Most of my money is spent on scooterparts. The rest is just wasted.
"ISO": '03 Vespa ET4 Malossi187 74MPH
Flash 9: 2001 Elite SR Contesta 72 ZX Tran, 9:1 Gears, Stock Airbox/Carb/Pipe 58.8 MPH
Punkin: 2010 Vespa/Malossi S78, 61MPH
ANytime I have seen that sort of damage it is ALWAYS a piece of debris in the crankcase. You CANNOT get all the debris from a previous meltdown or problem by "rinsing" it out. The only way is to split the cases and do a thorough cleaning of both the crankcase and crank. I am surprised there isnt a matching groove in the cylinder. If there is I didnt see it in the pics. The most probable cause of that groove is a roller fallen out of the wrist pin bearing.
Despite all the time spent posting about ring gap, thats not the issue here.
