89 120 timer base not moving properly.

mookieo2

Petty Officer 3rd Class
Joined
Jun 12, 2002
Messages
84
I had another thread up about the problems I'm having. I think it may be a timing issue. I am getting a gun from a friend tomorrow hopefully.


I have a 120TLCEM 1989
I rebuilt carbs, adjusted linkage, new thermostats, power pack, 120 psi all cylinders, de carbed motor, new plugs, and it will sometimes idle real nice. I took it out and anything over 1500 rpm's it ran really rough and tried to stall out. Talking to one of the mechanics fromm the boatyard next door he mentioned maybe the timing isn't moving right.

I came home and checked It seems that the timer base isn't advancing. What moves it. There is a linkage that attaches to a plastic tube with a knob on it. There is a spring inside. When the throttle is advanced it pulls this tube, when it is almost to the end it moves the linkage that advances the timer base. At WOT it only advances a little. I can get pics later if anyone has an idea. So it seems to me that The plugs are fouling and engine will not run properly over 1500 because the timing is not advancing the spark. Is there any way to fix this or adjust. the book I have Clymer doesn't say anything about how the timer base advances. The timire base will not always go back to its full starting position.
 

boobie

Supreme Mariner
Joined
Nov 5, 2009
Messages
20,826
Re: 89 120 timer base not moving properly.

You'll have to pull the flywheel and ect to get at the timer base. Remove it and clean out the old grease which is probably in it. Lube it with tcw-3 when putting it back together. I'd recommend an OMC factory service manual. Clymer and Selocs both Suck.
 

mookieo2

Petty Officer 3rd Class
Joined
Jun 12, 2002
Messages
84
Re: 89 120 timer base not moving properly.

Followed what you said. also took a soft brass wire wheel and cleaned the rust off of the magnets on flywheel and stator, put everything back. Timer base moves freely now with throttle. Still didn't fix my problem. :(
 

boobie

Supreme Mariner
Joined
Nov 5, 2009
Messages
20,826
Re: 89 120 timer base not moving properly.

Is the timer base now advancing to to it's WOT timing stop??
 

mookieo2

Petty Officer 3rd Class
Joined
Jun 12, 2002
Messages
84
Re: 89 120 timer base not moving properly.

Yes it advances to the stop and then the rod with the adjustment knob on it moves forward more to open the throttle plates and I go to full throttle.
 

boobie

Supreme Mariner
Joined
Nov 5, 2009
Messages
20,826
Re: 89 120 timer base not moving properly.

Is it still running the same way??
 
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