Asso piston

[RAP 200]

Does anybody know what sort of rpm a 66mm [2 chrome ring type ] asso piston will put up with

[sean brady scooters]

1.5mm rings...........57mm stroke............
good for 8000 revs.........maybe a little more..........8500 tops ..reliably.........
a lot depends on shape and width of ex port...............

[sean brady scooters]

i,m sure these could cope with 10,000 revs...........for a while.............but not for long.....................