I posted a while back that my 1991 Honda XR250R was burning oil after a Complete Topend rebuild, It is still burning oil and I will tell you some of the story again because I got something bugging me, I got the bike and rode it for about a week and I was riding in my yard and the bike just quit and would not start back so my dad tore the top end down only to see the whole thing was tore to ****, So he took it to a guy and he called back and said that the oil pump was not working so we orded a whole new Top-End for it including a new Valve cover and Cylinder head since the head was so messed up, So I was going to go with a Wiseco piston so I had to order a new sleeve anyways so The dealer ordered the piston for us and then had to bore the new sleeve to fit the piston, So anyways we get to whole new topend put together and I get it home and it is smoking terrible and my dad said well the Rings may just have to seat so we waited and now it is still smoking so My dad talked to the guy that rebuilt the engine and he said maybe there is a Low-Spot in the cylinder wall alowing oil to get past the rings, So my dad is going to take it back apart when he gets a chance, Now for the part that is bugging me, I was talking to a guy on AOL Instant Messanger last night and he is about 16 years old like me and he has a 2000 XR250R, He got it and it was burning oil so he put a whole new top end in it, I told him the story on mine and he said that when you bore a cylinder to fit the piston that you cannot have a LOW SPOT, Is this true? He asked me how often I changed my oil after the rebuild and he said that he put oil in his and then when the engine got to operating Temp he changed the oil again, and then he rode it for about 5 hours and changed it again and he said if you don't do this on a new engine there are little pieces of metal that will score your cylinder walls and create Blow By, He said that if I went above Half throttle during break in I could have seriously damaged my engine, I didn't go above half throttle but my uncle did, I was just learning to ride my first motorcycle so I was scared to go half throttle, He said that it is probably my fault that the engine is burning oil and that since I have rode it for about 2 months with it burning oil that I will probably need atleast a new piston and rings and maybe a whole new cam and Rocker arms and everything else, I cannot afford to pay for another topend and if I didn't change the oil like he did could this be the problem, I have more questions but I have to go to work so I will ask you experts when I get home, Sorry for the long post but I am just so fustrated and confused and kind of depressed about the whole thing because I just spent over $1000 including labor on the topend so I can't do this again, I am still paying the bike off, Please help me out,Matt