OMC 305 GM STILL will not go over 2500 rpms

kicks2

Cadet
Joined
Aug 30, 2003
Messages
7
Here is an update, which includes everyone's feedback!<br /><br />Replaced the coil, pts, plunges, condenser, cap, rotor, H20 separator, fuel filter and siphon valve.<br /><br />Checked timing to verify it is advancing, checked all fuel lines for blockage, checked cylinder compression (all of right bank at 150psi, all of left bank at 170psi) checked carb & choke linkage for binding, checked cut out switch for correct operation and rebuilt the carb.<br /><br />And it still will not go over 2500 rpms!<br /><br />The fuel pressure at the carb is 3.5 psi, the manual indicates it should be 5.75 to 7 psi. But, spoke to 2 marinas and they both stated that it is not the fuel. Fuel pumps either work or quit!<br /><br />I am dazed and confused. Can anyone help!?<br /><br />Your input would be appreciated. Thanks Joe
 

The Marine Doctor

Commander
Joined
Jul 25, 2003
Messages
2,177
Re: OMC 305 GM STILL will not go over 2500 rpms

Buy a new fuel pump. It is not up to spec anyway. That is reason enough.<br /><br />Fuel pumps do get tired.<br /><br />TMD
 

hoot

Chief Petty Officer
Joined
Sep 8, 2002
Messages
434
Re: OMC 305 GM STILL will not go over 2500 rpms

don't know what plunges are. not much left to replace. spark plug wires maybe. what do the plugs look like after you try to get rpms? clean, sooty, ??? is your throttle stop set correctly? maybe the control lever is not pulling the cable.
 
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