Evinrude 40452 40 hp carb linkage adjustment

[Tom]

Can someone please run through the procedure for adjusting the carb linkage on a 40 hp Evinrude 40452? It seems like the carb is not open far enough at idle, and the roller hits the advance plate prior to the notch. I don’t see any way to adjust this.
Thanks!

Tom Manley

[frankr]

The roller is not supposed to make contact at the notch. Look to the left of the roller and you will see a pointer sticking upward from the intake manifold. When the notch on the cam aligns with that pointer, the carburetor should be just barely ready to start opening. I’m not 100% sure, but it might be adjusted by moving the cam in /out.

Related to all this is the cruise fuel saver rod along the side. When the spark advance hits the stop at full advance (in forward gear), contact is made with the setscrew barrel on the rod. Further movement of the throttle control pushes on the rod, opening the carburetor to WOT position.

[Tom]

I have the fuel saver adjusted correctly, I think, but I don’t see any way to adjust the roller.

T

[fleetwin]

Is the throttle cam slotted on one side so it can be moved in/out slightly to set up the cam pick up? Loosen the cam screws slightly and try to move the idle side of the roller in/out. I don’t know why I seem to remember some sort of offset cam screw on some of those carb throttle arms to set up the pick up as well….Kind of like the offset screw that adjusts the OMC universal mag points….Maybe I’m just losing it….

[Tom]

I checked it again, and found that the roller contacts the cam when the notch lines up with the pointer on the manifold. I also found that the mag plate was moving stiffly, and lubed that up. I think I’m OK now, I’ll take it out tomorrow.

Thanks, guys.

T

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