yoke and thumb wheel

[dieselcat]

Was reading about synchronizing your carbs.So i did so by making sure all butterfly's where closed while in neutral [which they weren't to start with]Then i made sure roll pins were perfectly vertical when at WOT.Idles better than ever but i don't have any fast idle when i move the lever up.Found that the yoke and thumb wheel was broke.Replaced it and still same thing.
I adjusted the thumb wheel so that when i pulled the fast idle lever,then it would work properly.After i adjusted the thumb wheel then motor wouldn't idle,it would cough and sneeze then die.would fast idle fine,would kinda sputter at low and mid range,so i put it back where i started.Does this adjust the timing in some way?I am having a hard time understanding why this would effect idle cause butterfly's are still completely closed and i didn't move any other linkages.

 

[EN2]

Re: yoke and thumb wheel

Are you working on a 2 or 3 cyl looper?

 

[dieselcat]

Re: yoke and thumb wheel

sorry forgot to tell ya what motor
1987 rude 88 spl,4 cyl cross flo

 

[dieselcat]

Re: yoke and thumb wheel

anyone have anyidea as to what i'm talking about???

 

[EN2]

Re: yoke and thumb wheel

I think by adjusting the yoke and thumb wheel.You moved the pick up timing to be aproximatly where it should be. It sound like someone was trying to speed up the idle this way. As you know butterflies should be completly closed.Apparently low speed circuits are dirty. If you have the OMC manual i believe it will show how to set the pick up timing, using a timing light. I havent worked on a v4 much, but my 2cyl looper linkage yoke and thumb wheel,cam etc, looks very similar. P.S. the roller should not touch the cam.