60 carbs on 40 merc.

[benelli101]

Thinking of putting 60 h.p. carbs and reeds on my 40 h.p. Mercury. Just wondering what kind of gains to be expected. Its a 2005 Mercury 40 H.P. 3 cylinder two stroke.

[Fast Fred]

it will step up, but the port map is dif' than the 60hp case, it Will Not make 60hp,
but will make a bit more than stock

[cory]

Hey Fred....do you know the difference in port maps for the 60 block as opposed to the 40? Alot of guys around here are raising the exhaust ports by a few degrees to help make a little more on top. Also, we've been decreasing case volume with epoxy to help with bottom end pressure. Do you have any experience with these 60 cube Mercs?

[Fast Fred]

i don't know the dif in the port maps. flute the piston crown on the intake side
so the ports will open sooner with out movin them. putin a choppin
on the 15" tuna mite help.