The exhaust valves are the ones where the exhaust pipe lives.
The valve covers do not need the bolts very tight, just enough to make the rubber seal and the bolts to not back out.
That lock tab on the fuel pump connector is far too close to the mount bolt to suit me, too. You are probably right about it being such a snug fit that the tab isn't needed. Just in case, keep that fact in the back of your mind in case some day the engine quits for no reason. If it does, just peek in there to see if it has popped out.
I agree that valve adjustment on the RX-3 is a nuisance, but it's the only complaint I have about the bike.
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