I have a 1975 85HP Merc. Have re-built both carbs, including needles, seats,& floats! Have re-built fuel pump & new water pump impellar. Replaced old internal wiring harness with new harness. Compression test,("GOOD", 120 to 125 on all 4 cyl)! Have good blue spark on all cyls!<br />PROBLEM: In...