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Downtown 300 / Low RPM engine vibration
« on: February 24, 2015, 04:44:27 PM »
I know single piston motors have the reputation of heavy vibration at low RPM but I'm noticing lately that it's getting stronger. This happens when the motor is cold, as the motor heats up it somewhat goes away. This has always been the case but in the last couple thousand miles has gotten worse. I have about 14K miles on it, I get normal oil changes (synthetic) and the valves were checked at about 8500 miles. Once motor comes to normal operating temps it's fine. The motor seems fine all the way through the RPM range but has heavy vibration in the lower RPM's when cold. Is this normal ?