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Throttle Sticking / Need help IDing Part

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dsinc1011

New member
Hi everyone,

I have an issue with my 1971 20 Hp Johnson Model 20r71s. And, basically what is happening is that recently I found a part (part no. OMC 0315762) that had fallen off the throttle assembly and I hadn't used it since.

One day I was out on a river, and the motor's tiller handle throttle was at or near WOT where the throttle at first felt stuck, then moved it up a little further and the throttle wouldn't do anything and it was just slipping around but if brought up to idle or low mid-range then it would drop to that speed after a slight delay.

Coming home, I found one bolt on the bottom of the outboard, but scanned everywhere and not sure where it was from.

Then running fine for some time not experiencing that issue again, I one day found the whole lockout lever cam off the throttle assembly unbolted and the other bolt in the cowl as well. Assuming it vibrated out.

I was told that I didn't need the part, because it is for preventing the pull start from starting in too high of revolutions, but I think this part has to do with the throttle.

Recently, going to a lake I had the same issue described with the throttle stuck at WOT or near WOT even when adjusting tiller then eventually correcting it self once I backed it down to the lower end of the throttle with a somewhat delay then sudden drop in RPM. Basically, when it did this I could not steadily throttle down because it was either higher end or lower end it was fine. However, I did occasionally did not have any issues but a good amount of the time I did.

I was wondering if anyone could please confirm whether or not this part is a potential culprit to the issue that is being caused or if the advice given was correct based on the missing part below? And if not that part, then is there any other advice? It just seems interesting to me that the occurrence of that part falling off is during similar time.

The part I am referring to is: http://www.marineengine.com/newparts/part_details.php?pnum=OMC0315762

Attaching photos below for reference of what happened.

Before: Before.jpg After: C5ApOAM.jpg

Thanks very much everyone!
 
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That part has to do with locking the recoil starter if throttle is open too far.----You may have more than one issue.
 
racerone said:
That part has to do with locking the recoil starter if throttle is open too far.----You may have more than one issue.
Click to expand...

So would adding that part help with my throttling issue where it seems to be getting itself stuck?

Or would it have nothing to do while it’s in operation?

Also the throttle doesn’t open too far the range is okay. I tested while it was not running with the lid open.

Any ideas then?

faztbullet said:
Love that smathering of sealer on t stat cover and wrong spark plugs
Click to expand...

My mechanic just had it for a service and installed the right spark plugs and the seal stuff works lol.

Any idea about the issue though? Would adding that part back help with anything or would it not affect it during operation?
 
If the cam you are referring to is loose, then of course it could be banging up against something and interfering with the throttle. Even more interesting, what is with the screw lying up under there??
 

Attachments

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fdrgator said:
If the cam you are referring to is loose, then of course it could be banging up against something and interfering with the throttle. Even more interesting, what is with the screw lying up under there??
Click to expand...

It was loose and it fell out. So as per some advice I took it out, but then the throttle was doing the thing I was describing after taking out the loose and fallen pieces.

I don’t know if me not having it bolted in is affecting operations.
 
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Well there you go, if that is where it came from, that's your throttle problem. You'll be lucky if it hasn't caused even more damage.
 
fdrgator said:
Well there you go, if that is where it came from, that's your throttle problem. You'll be lucky if it hasn't caused even more damage.
Click to expand...

But I guess what I am wondering is would that part or component not being there affect the throttle of the outboard while it is running or in operation?

My understanding is that it is only for stopping pull start at too much throttle or am I incorrect on that one?

Thanks again all for the help. Very much appreciated
 
????Didn't you just confirm that the screws had come out of the brass magneto support ring?
 

Attachments

  • Magneto mounting rings.jpg
    Magneto mounting rings.jpg
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fdrgator said:
????Didn't you just confirm that the screws had come out of the brass magneto support ring?
Click to expand...

I miscommunicated, sorry. The screws came from the ones holding the lockout lever cam in and vibrated out. But my question has to do with will not having that lockout lever cam affect the issue I am having?
 
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