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hard start after warm up 1989 4.3

D

dimarker4

New member
89 4.3 merc new fuel pump, , rotor, cap,rebuilt carb,new plugs[old ones were light tan].the problem....runs great idles great,750 after running for a while i will turn the engine off and try to re start not always but 30 percent of the time it takes a little cranking to start. the other 70 percent of the time i just turn the key and it fires right up. timing is set at 8 btc. any ideas thanks
 
Plug color says the engine is running correctly. Idle speed should be 600-650 in gear on the water. Remove and clean all the ignition wire connections. Spray them w/a few drops of WD-40 and let it dry; reconnect. Look at the optic trigger under the rotor. If it is rusted that could be your culprit. Old models have tiny bare wires that will corrode.
 
the ignition sensor is rusted somewhat. i removed it and im going to replace it. i will clean all ignition wires as well. i will let you know how it goes after i get it on the water. i will set idle as well ,thanks
 
How you running it ?

This is how i run a carbed motor. Cold i pump the throttle 2-3 times leave the throttle down 1/3 of the way and crank it. It starts i leave the throttle alone should run at about 1000-1500 rpm. Choke opens you hear the motor change, put the throttle in neutral for another minute or 2.

Then i slowly give throttle till i'm at say 300-3500 rpm i run 2/3 wot.

I want to stop i slowly back off the throttle till i come to a stop put throttle in neutral and aloow the motor to run at least 4-5 minutes at idle.

Shut off motor. Say i want to start after 30 minutes i try it in neutral no pumping nothing, crank it should start.

No start then a pump or 2 and back into neutral and crank no start then it's 1/3 down the thottle as a cold start.

Why i just write all this cause the idle at warm up and i
 
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