Evinrude started getting low grade bolts from a different company and did not realize it until they built a bunch of motors. There is a recall on a bunch of Ficht motors. When I did get the motor back to my boat dealer they replaced all 8 bolts (2 per injector). If the bolts don't have a 17-4 on the head of the bolt make sure you get them replaced . The old bolts had a small yellow dot on the head of the bolt . By looking at both bolts you could tell the yellow dot bolt were low grade bolts. You would think they would use the best for a 10 thousand dollar motor. Maybe they saved a couple of dollars by using the low grade bolts. :'( :'( :'(