Yfz 450 white smoke

[THORrider350]

hey all, i had my engine rebuilt in like september and rode it maybe 10 times since then. the last 3 rides its been kinda blowing a little white smoke for the first 5 minutes when you rev it up, at idle no smoke. any idea's what could be up if anything? to rich?

[Ride1Rob]

Rich doesn't cause it to blow white smoke. Either rings are gone or it's coolant. Does it have a burnt coolant smell to it or does it just smell like burnt oil?