ENGINE SPECS TO IMPROVE YOUR 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, increase main jet by .002                                                

All V6 Mercury, retard timing 2 degrees from original spec.             

Mercury, 1987 and up 3 cylinder, 70-90HP, increase main jet by .002

Mercury, 1987 and up 47 cylinder, 100-125HP, increase main jet by .002

Mercury V6 EFI, verify fuel pressure. Minimum, of 39 psi

Chrysler/Force 3 and 4 cylinder engines, retard timing to 28 degrees instead of 32