Adjusted the fuel on an 02 2388 today. I used a 10mm wrench to loosen a nut then turned the screw in 1 turn. Was this the right screw ? There was also a larger nut with screw in there ---maybe 5/8 nut. I wasn't sure which one that I should have adjusted. Adjustment didn't seem to help much with the power. No load engine speed is 2500 rpm. Is there any way to check the boost ? Thanks for any help.