When you put it back together, did you line up the dots with the two marks on the cylinder? Did you do the work yourself?
Does it rattle or clank when it is running? Is something broken in there?
As far as your second question, "You would have to bring it in and let us look at it". :-) Late last fall, I put a new piston, piston pin, circlips, small end bearing, rings, base gasket, head gasket and KIPS gasket on an '87 model I sold earlier this year, so I am pretty familiar with it.