2001 Edition Yamaha F225A and LF225A Outboards Service Manual, Page 94Get this manual
Fuel system
19Measure the vacuum of cylinders #1, #3, and #5Repeat step 12 if out of specificationVacuum difference between cylinders: 20 mmHg (27 mbar, 0.79 inHg) 20Measure the vacuum of cylinders #2, #4, and #6Repeat step 12 if out of specification21Check the average vacuum difference between the port and starboard banksAdjust the port throttle stop screw if out of specification
Link rod nut: Nm (0.4 kgfm, 2.9 ftlb)