Throttle adjustment on 56 Evinrude 30 ES

[JENNIE116LOWE]

I'm getting ready to install Simplex controls on a 56 Evinrude 30 ES and I noticed the manual throttle wont move past the start position. If you start at the far right or the slow position and move to the left towards the fast position it stops at the start position. Does the motor have to be running to advance to the fast position or do I need to make an adjustment?

 

[JENNIE116LOWE]

Re: Throttle adjustment on 56 Evinrude 30 ES

I guess I answered my own question, found this info on another site might help someone else.(Synchronization Of Older 2 Cyl Engines)
(Such As The 28, 33, 40hp Etc models )

On the linkage that runs from the armature plate (the plate the coils & points set on) to the carburetor throttle roller, loosen the set screw on the brass collar that you see there and temporarily move it away from the armature plate/vertical throttle arm clevis (clevis is that thing the linkage rod slides through). We'll refer to that vertical throttle arm/armature plate clevis simply as the "clevis" from this point on.

Look at the cam that's attached to the front of the armature plate.... the cam that slides up against the carburetor throttle roller. You'll notice that there's a scribe mark on it. Also notice that at the top portion of the intake manifold there is a raised portion, that top portion forming a point. The carburetor roller should contact the cam and just start to open the throttle butterfly when the scribe mark is dead center with that point.

With the engine in gear (not running of course) have the armature plate advanced all the way (by hand) so that it is up against its stop. Now adjust the brass collar (set screw) on that associated linkage rod so that it is up against the clevis. It should be adjusted so that there is either no play, or just a hairs play between the collar and the clevis.

At this point, the armature plate movement is not advancing the throttle butterfly via the rod movement, but further movement of the throttle control, although the armature plate cannot move any farther, causes the tension spring at the armature plate to allow the vertical throttle arm to move farther which now advances the carburetor throttle butterfly via the rod. When fully advanced (full throttle), the carburetor throttle butterfly should be fully opened (horizontal).

If all else with your engine is as it should be, that should do it.

 

[lindy46]

Re: Throttle adjustment on 56 Evinrude 30 ES

That's the procedure for sychronizing the carb and the magneto. I guess you figured out that the shift lever must be in "forward" to fully advance the throttle.