9.5 h.p. Throttle closing.

[6tring]

1964 Evinrude 9.5 h.p.
I recently went over everything and it runs great.Starts good and accelerates smoothly. The problem is when at full throttle when I remove my hand from the twist grip the throttle wants to close slowly to slow position. If I keep hand pressure on if all is well. This model does not have a friction piece or spring in the handle by design as latter models. (I studied the parts diagram) All I can figure that it may have something to do we with the detent part # 0310031 and spring that rides along the serrations on the throttle plate that may add friction to keep the throttle plate in a specific position is my only guess. Or possibly is this a built in safety feature as if you let go of the tiller handle the motor slows? Any I put would be most appreciated.

 

[racerone]

Are the coils set in the proper place.----Perhaps coils are rubbing on the flywheel.-----Or adjust tension on that friction bit on the magplate.

 

[6tring]

Coils were set in place using a ring so that should not be an issue.. What is it you mean by friction bit?

 

[racerone]

The item you referred to in post #1.

 

[6tring]

Pulled the flywheel off to better access the detent and spring. I would have to remove the throttle plate to remove the detent and spring. No space to remove it otherwise. I did not want to make this a real project at this time so I used a very small pointed file to clean the serrations followed by wire brushing on the Radis of the throttle plate. I was given enough space by pulling back the detent away from the throttle plate to get a pipe cleaner in between to clean the detent. I added a plastic shim behin the spring as to tighten things up a bit. I will report back after testing on the water.

 

[6tring]

Returning back with results of the open water test.
Throttle held it set position at mid range or higher. The throttle would creep slowly close at in the lower ranges.
That is when the vibration set in for what these models are noted for without the anti vibration kit installed as this particular motor one does not have. I have no plans to acquire and install a kit. Runs out smooth and accelerates just fine in the higher RPM ranges.