Reason is the cover is a stamped steel product. It is not machined flat.
When you are fastening non machined parts together, there is potential for the parts to shift and settle, and the head of the bolt to dig in under load, which can relieve some of the initial bolt torque. The lock washer is there to somewhat help prevent the bolt from losing its grip.
But split ring lock washers can actually cause a different problem, splitting and squeezing out! If you want to use split ring lock washers, be sure to get a good grade, not the hardware store bulk bin variety.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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