My 99EC300 still has stock piston and rings...never felt the need to pop the cherry on the topend yet. I don't ride every weekend, but usually 1-2 times a month if work and family allow time. I've been careful about air filter maintenance and trans oil changes, airfilter changed every ride and oil every couple. Run the bike 40-1 with-don't laugh-Honda HP2 and have never had a fouled plug or jetting issues. It runs like a top still, just as strong as my buddies "new" 05 ec300.
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