05 250 Burning Oil?

I have a 2005 crf250r in otherwise great condition. I change the oil/oil filter on a regular basis. I just put a new yoshimura system on it and it began to smoke. I thought it may be the pipe just burning in but that wasn't the case. I put the correct amount of oil in it and when I ride for say 5 hrs or so when i check the dip stick it barley reads. Im not noticing a significant power loss with the bike it still seems to run great, other than the fact it burns oil. I find myself adding oil while Im at the track. I was told the top end may need to be rebuilt but Im looking for other options before i spend the money.


original top end? if so and being an 05 it probably needs a new top end (piston, rings if valves are fine)

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