1961 10hp Johnson QD-22 Throttle Problem

[ScottyOMC]

I’ve got an issue with my throttle where when I take the throttle all the way wide open, the throttle roller gets past the end of the plate.
Is there an adjustment to change how far I can open the throttle?

picture attaches.

Thank you!

 

[F_R]

Post a picture of the gearshift side of the powerhead (with the throttle in the over-travel condition). Actually, you probably will see the problem even before you take the picture.

 

[ScottyOMC]

So I understand where I need the shifter arm to sit but I can’t find what I need to adjust to have the arm sit tighter into the plate.

 

[ScottyOMC]

Post a picture of the gearshift side of the powerhead (with the throttle in the over-travel condition). Actually, you probably will see the problem even before you take the picture.

So I understand where I need the shifter arm to sit but I can’t find what I need to adjust to have the arm sit tighter into the plate.

 

[racerone]

deleted

 

[ScottyOMC]

Is there a roller missing below the bottom cowling?

 

[racerone]

Post pictures of the shift lever.----The area below the cowling where a pin moves that arm.

 

[ScottyOMC]

Post pictures of the shift lever.----The area below the cowling where a pin moves that arm.

 

[racerone]

Does the vertical arm move when you operate the shift lever?----Prop must be turned when shifting.

 

[F_R]

OK, there are two possibilities there, which I cannot see, but you can look for yourself.

1. Obviously, the vertical interlock bar is supposed to limit the armature plate rotation, which it is not doing. First place to look is where somebody suggested. Is there a roller in the shifter pin that rides in the notches at the bottom end of the interlock bar? But that begs another question---is it SUPPOSED to have a roller? That feature was added somewhere along that time frame. But if it is supposed to have a roller, but doesn't, then it will not kick the interlock bar far enough in toward the armature plate.

2. Is there a nylon bushing on the shoulder bolt in the middle of the interlock bar? Once again, not all motors had such a bushing. But if is supposed to have one but doesn't, same results as above.

3. Sorry, I don't have a parts book handy to look up and see what is supposed to be there.

 

[F_R]

So, I found the parts book, and it appears that model had neither a roller nor a pivot bushing. But don't give up yet. The problem can still be in those areas, especially excessive wear at the pivot pin or the hole it goes through, or the notches in the interlock bar. That motor has been run many hours at wide open throttle, so expect to find wear.

Another, less common fault is a missing washer #34, part number 303775, on the shifter shaft. If missing, the shifter shaft can slide too far into the exhaust housing.

 

[racerone]

Be an easy fix here.----But we can not see or feel your motor !!

 

[ScottyOMC]

So, I found the parts book, and it appears that model had neither a roller nor a pivot bushing. But don't give up yet. The problem can still be in those areas, especially excessive wear at the pivot pin or the hole it goes through.

Another, less common fault is a missing washer #34, part number 303775, on the shifter shaft. If missing, the shifter shaft can slide too far into the exhaust housing.

View attachment 340248

Thank you very much for your detailed response, that’s very helpful and I really appreciate it.

 

[ScottyOMC]

I’ll take a look at the suggestions made. In the mean time. I took a video to hopefully explain better.

 

[oldboat1]

may have multiple issues. The carb should have a flat spring assembly at the top rear, I think. On close up, it appears something up there has been sawed off.

 

[F_R]

I’ll take a look at the suggestions made. In the mean time. I took a video to hopefully explain better.

Your video shows it is going to the second stop in neutral. It should only go to the first stop in neutral, second stop in reverse, and third stop in forward. We are back to where we were, too much wear somewhere in that interlock bar