Will a 48mm piston work in a 49mm steel sleeve cylinder?

Those deposits on your head are probably from mixing in the tank, some of the oil settles out and makes the mix rich here and there. If you have a little jerry can and mix it up in that, I bet a lot of those deposits go away. What does your plug look like?
 
Those deposits on your head are probably from mixing in the tank, some of the oil settles out and makes the mix rich here and there. If you have a little jerry can and mix it up in that, I bet a lot of those deposits go away. What does your plug look like?
First pic is after I completely cleaned the top of the cylinder and ride 40 miles with it running like it was lean.
 

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Will I do any harm by removing some metal from the upper lips and the lip that is opposite of the exhaust port? (Cylinder is upside down)
 

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