67 Johnson 33 hp Super Sea Horse Issues.

[rfevans]

I have a new to me 33 hp Johnson that seems to be falling on its face no power at 2/3 power or above an then fouling plugs. I dont have a service manual as of yet but that is already ordered. In the mean time I am going to try a trouble shoot. Here is the plan for now first check compression altho I dont think that is the issue, next is where my question is this has some sort of runaway feature on the side that I think could be the issue how do you by pass that feature so I can cancel that out as the problem. Next on the list would be checking for good spark, then on the carb. The other thing I'll be looking for is a good wiring diagram for this engine it has what I believe is a generator thats belt driven as well as a starter it also has a control box separate from the engine with a voltatge reg. and starter relay so I have to figure out how to wire it correctly. I guess thats it for now but any help would be great. Dont know much about this specific model. Let me know if Im on the right track....The fish are always biting when Im on working on my boat...LOL thanks ahead of time Randy

 

[F_R]

Re: 67 Johnson 33 hp Super Sea Horse Issues.

This is as close as I can come to the diagram. Colors may vary. IF wired correctly, chances of the vacuum cut-out switch being at fault are slim to none. If you insist on checking it, disconnect the black wires from the center post, which disables it.

EDIT: Notice the safety switch, also connected to the vacuum cut-out switch. At 2/3 throttle that switch is open and the vacuum cut-out cannot do anything. That is why I said chances are slim to none IF wired correctly.

 

[rfevans]

Re: 67 Johnson 33 hp Super Sea Horse Issues.

Thanks F_R the diagram is huge help....Have not delt with vacuum cut out switch before so anything about it is news to me....I'll Check my wiring tonight and pull a compression test then spark with my spark tool and go from there.....If I have good compression she'll be worth the effort I think. Don't know much about the old 33's. Is the generator fairly common on these? Thanks again..Randy

 

[F_R]

Re: 67 Johnson 33 hp Super Sea Horse Issues.

The generator was an accessory kit, did not come with the motor when new. The 33hp actually was a low cost alternative to the more deluxe 40hp, so since cost was a factor, not many got the generator. But it was standard equipment on the electric shift 40hp, and an accessory on the manual shift/electric start 40.

 

[rfevans]

Re: 67 Johnson 33 hp Super Sea Horse Issues.

Thanks again F_R good info on the generator, I finally got a chance to take a good look at things today compression was good 118 in both cylinders that had me worried. Spark was good as well jumpin 5/8 blue gap in my little tool. I do think I found part of my issue tho the little pin just above the cog gears on the tiller handle is sheared it would still throttle up and down but had a lot of slack and I think the P. O. adjusted the linkage to where the it was full throttle way in advance of the Timing. I knew that was something was not right with the hand throttle the other day when I was messing with it. The other thing I have found is that there is no choke on this motor its all been removed linkage and all the butterfly is wired open. So it looks like I'll have to do some parts looking...lol. Why in the world someone remove the choke and linkage is beyond me. The wiring is there for the solenoid but thats it. Anyway all is well tho I gave 150 bucks for the little jewel and looks wise beside the missing choke looks like a really good low hour unit.

 

[F_R]

Re: 67 Johnson 33 hp Super Sea Horse Issues.

Ah yes, how many times have I seen the carb linkage screwed up that way. Usually to compensate for a busted/reconnected remote control cable.

It will jump a 5/8" gap? Whew, that's a lot for a magneto ignition.

 

[rfevans]

Re: 67 Johnson 33 hp Super Sea Horse Issues.

Oops sorry I meant 3/8 but its pretty and blue and bit me once good..lol. I need a picture of the carb area on one of these to see how things look and what I'll need..

 

[F_R]

Re: 67 Johnson 33 hp Super Sea Horse Issues.

Setting the sync is a two step process. First step is adjusting the roller so the throttle butterfly just starts to move at a certain point. There is a sync mark on the brass cam that opens it. The carb does NOT start to open when the roller is aligned with that mark. There is an upward extension of the intake manifold, which is a pointer of sorts. When the mark on the cam is aligned with that pointer, the butterfly should be just ready to move. The push rod along the side of the powerhead must not be interfering with this pickup in any way. OK, second step. There is a sliding set collar on that rod along the side. As you move the throttle control, it should rotate the magneto armature plate till it stops against a nub on top of the powerhead (shift in forward gear). That is full spark advance position. Only when it reaches full advance should the control lever contact the set collar on the rod. Then further movement of the control overcomes a spring and pushes the rod which opens the carburetor butterfly all the way. The rod must NOT affect the butterfly before full spark advance position. Note: Full spark advance and partially closed butterfly is the "cruise throttle" position. Supposedly gives nearly full power at reduced fuel consumption. Works well on a boat where it is not struggling to just keep it on plane.