Alright. Owner brought over that 660 for me to combine with the 066 to build one running saw. I was checking out everything tonight. Put 660 back together after checking p/c bearings all the good stuff you know. Put a plug in but didn't tighten up metal clamp on intake. Notice while turning flywheel by hand I can feel compression but it's not an over exaggerated feel. What do y'all think?? Rings ?? Decomp???