Doing the valve adjustment on my 99 Katana 600. Figures the last valve cover bolt (Allen 6mm) is tight as hell and I fear I might round it out if I keep going. It is of course the most difficult one to get at and will require engine removal should I strip or break it. Anyway any ideas as to how to proceed to loosen this one. Also any ideas on getting a little more low end power from this bike without breaking the bank, keeping in mind that I do daily highway miles. Thanks JRE