MERC w/ NO POWER

[frusterated]

I have a 79 Merc. 140hp. My problum is that the motor refuses to rev up to speed, but likes to sputter with a load, but will idel and run slowly all day long. I have rebuilt the carbs, fuel pump, put in new plugs tested the compression, blown out the lines, tested for spark and set the timing. What am I missing? Is there reed valves that may be bad? are thear jets that don't come in the kits that I might have missed? Oh ya if the boat once planes out it quites sputtering but still won't wind up. Thanks in advance.

 

[skeets]

Re: MERC w/ NO POWER

Hello frustrated<br />Welcome to the forum<br />No acceleration, idles well but when put to full power dies down.A few thoughts<br />High or low speed needles set too lean<br />Dirt or packing behind needles and seats<br />High speed nozzle obstructed<br />Choke partly closed<br />Improper timing and synch<br />points improperly gaped or dirty<br />Did you use compressed air to ensure all of the passages of the carbs were clean.<br />Good luck

 

[abogiant]

Re: MERC w/ NO POWER

prop with to much pitch will cause those symptoms also

 

[jdkzrt]

Re: MERC w/ NO POWER

Fuel pump.

 

[frusterated]

Re: MERC w/ NO POWER

I'll rip the carbs back off and try it agine. I ran some stiff carb cleaner threw and it seamed to help some.