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Engine Rebuild.
1986 and UP 70HP OMC increase main jet one size.
1989 and UP 60HP OMC increase main jet one size.
V4 and V6 Crossflow OMC set Ignition timing at 24 degrees instead of 28.
1985-92 V6 Looper OMC install #65 main jets in engine with #62 main jets.
all V6 Mercury Outboard, increase main jet by .002
all V6 Mercury Outboard, retard timing 2 degrees from original spec.
Mercury Outboard, 1987 and up 3 cylinder, 70-90HP, increase main jet by .002
Mercury Outboard, 1987 and up 47 cylinder, 100-125HP, increase main jet by .002
Mercury Outboard V6 EFI, verify fuel pressure. Minimum, of 39 psi
Chrysler/Force 3 and 4 cylinder engines, retard timing to 28 degrees instead of 32