sylvan 19ft, 4.3 omc

brian102

Seaman Apprentice
Joined
Jun 5, 2010
Messages
32
it has the 2 barrel rotchestor carb on it, idles fine and drives fine, but it trys to stall or hessitate when taking off, if you slowly increase throttle it trys to dye out then hit the gas and it comes back. its a 1989 by the way. changed the fuel filter already, both on the carb and water seperator. what else could it be? also is it a common thing for the tach not to work, what are these run off of? it works sometimes then sometimes it just peggs out then sometimes it stays at 0. whats the max rpm these motors run at anyway? thanks!
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
70,513
Re: sylvan 19ft, 4.3 omc

changed the fuel filter already, both on the carb and water seperator. what else could it be?

Ayuh,... My guess is the Carb itself....

The tach draws signal from the coil....

4400/ 4800rpms, at WOT...
 

cr2k

Captain
Joined
Mar 19, 2009
Messages
3,730
Re: sylvan 19ft, 4.3 omc

Sounds like the accelerator pump in the carb. Common problem. Time for an overhaul. When doing so check the tension of the spring on the new pump plunger. If it is softer then yours change the spring. You want to use the stiffer one.

Tach should be the grey wire on the distributer side of the coil.
 
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