I have a similar issue on my series 2 when I did my first valve adjustment. You can see in the following thread, hope it helps.
Would also recomment getting one of these for you toolbox. Very useful to find real TDC.
https://www.amazon.com/gp/product/B000CPCA5G/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1
Jay