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Piston and ring question

pdcarpen

CB750 Member
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houston
I have taken a 1973 cb750 motor apart. The previous own put new rings on but come to find out #2 rings are broken and scratched the piston wall. I have 2 extra sets of pistons the ring gap on extra sets are not the same as the ones in the motor. The pistons in the motor have larger gap? I will try to post pictures. #1motorpiston.jpgsparepiston1.jpgsparepiston2.jpgCylinder#2.jpg
 
measure the gaps. stock is .0079 to .016 with a max of .028 on the top and second ring and .0004 to .012 with a max of .028 on the oil ring.
 
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