Valve stem seals, valve spring plus a question or 2

[londonboards]

It think this again proves the unreliability of compression testing. Nothing you have done so far would explain the differences in compression testing results satisfactorily.

Most likely cause of oil burn in this case would be that the rings need replacing and the cylinder needs honing. Or a leak somewhere. Have you checked around the sump?

[DohcBikes]

Yes you definitely need to put your springs in right. Its hard to believe anyone would even ask, for the simple fact that essentially you are asking us to tell you whether or not knowingly doing it the wrong way is ok. The answer is no. It actually makes a big difference in how fast the valve changes directions and most certainly will cause valve float.