Synchronization

[johnb]

I've got a '62 - 40 h.p. Johnson that hasn't been run in a while. I think I can get it started, I just replaced the gasket (homemade cork) to the fuel pump, it was leaking when I squeezed the squeeze ball.

The manual I have (Seloc's) tells me that whenever any work is done to the fuel pump or the carburator, the two items need to be synchronized so that they work in harmony under a load.

Does anybody have experience in doing this? I've never done it and would like to know the reasoning and the effects of synchronization. Also, how necessary is this? Will not doing it prevent my motor from operating?

 

[HighTrim]

Re: Synchronization

Referred to as a lync n sync

As you advance the throttle control the ignition timing advances while at the same time the carb butterflies open. It is critical that the two are in sync or in phase. The advance must track the butterflies exactly and at the right time. This procedure is lengthy and should be followed exactly as outlined in your manual.

I would not imagine this is necessary for your work performed, although others may correct me.

 

[samo_ott]

Re: Synchronization

It does not make sense that the manual calls for a link n sync when the fuel pump is worked on? Is that really what it says?

 

[iwombat]

Re: Synchronization

I was thinking the same thing samo, that's kinda nuts.

 

[tmcalavy]

Re: Synchronization

Don't need to synch the fuel pump...it just pumps or not. To synch the magneto advance and carb, look on the front of the motor up behind the carb. You'll see a tapered plate on the front/bottom of the stator plate (where the points/coils/condensors hide). As you advance the throttle/plate the tapered piece contacts a small upright roller that should be hooked to the rear butterfly linkage on your carb...so that the butterfly opens as the magneto advances. Now look for a small mark on the tapered plate. When you have the throttle at Start, or pretty close to it, the mark should align with an upright casting on the engine block right behind the carb. At that point, the roller attached to the carb linkage should be just touching the tapered plate...it should be out/forward just enough to start the rear butterfly to open. You can look through the carb throat with a flashlight to confirm this. How to adjust the linkage or tapered plate differs from motor to motor, but that's the process in a nutshell.