co-op No.2 won't run more than a couple seconds

bgrieves

Member
I have a CO-OP No. 2 Chrysler engine with a zenith carburetor It was full of dirt and mud wasp and would nut run at all, I got everything cleaned out, good spark starts up and dies after a couple seconds. I have cleaned all passages in the carb about ten times still the same thing, it seems to be starving for fuel.... Any help would be appreciated...
Thanks
 
Be safe, have a catch pan and a fire extinguisher handy, and remove the carb float bowl drain plug and notice the first rush of a half-cup or so of fuel as the bowl empties, then verify a smaller, but continuous flow continues of enough volume to feed the engine.

If not you need to check out the fuel system from the tank though the carb inlet needle and seat to figure out what is restricting incoming gas, if there IS a good stead flow of fuel, you need to look at fuel passage or main jet issues in that area of the carb.
 
I have tried moving it in and out to no avail. I have it set to two turns out right now.
Thanks for the reply
 
I put all new lines, sediment bowl, the bowl in the carb is always full. I will try that.
Thanks for the reply..
 
(quoted from post at 19:59:42 10/19/15) I put all new lines, sediment bowl, the bowl in the carb is always full. I will try that.
Thanks for the reply..

2x what Bob says, for at least 20 seconds.
 
Bgrieves,I know you said you cleaned carb,but did you run a torch tip cleaner,wire,guitar string through the passages and blow then out with a blow gun?Then use the straw on a can of carb cleaner to blow cleaner through them to see if they are completely open.How is the gasket and its small holes,is the venturi in good shape and in correctly?
 
Steady flow, jets are clean, got anything else? I don't know.
I got good spark, time is good, have cleaned the carburetor several times. If I choke it it starts right up sounds good,60psi oil, just won't keep running. I'm at my wits end haha.
 
(reply to post at 23:34:41 10/20/15)

I cleaned it all with wires,b12 cem tool, and air pressure. I did make a new gasket but I still have the same problem as before. I am going to try a remote tank today.
Thanks for all the help.
 
You do know that you could also have a spark problem like say a bad ignition switch or a bad condenser. I have a tractor that I had a problem a lot like your having and I found the ignition switch would work when it wanted to and then hit a bump and shut the engine down. Same can happen to any thing. I would double check your spark and make sure you have a good blue/white spark at the coil wire and All the spark plug wires.
 
So far I've added the coil a battery points condenser clean the carburetor took it all apart all the jets out wired through Kim tool carburetor cleaner about three times put a remote tank on clean fuel It gets good spark even when it's dying it gets a bright blue spark on the plugs.i have added a video of what it's doing.
 
As it dies what happens if you try to choke it?? If that helps then carb still has a problem of some sort and some times getting a carb clean can be a real pain. I soak carbs in a can of carb cleaner for 24-48 hours
 
Big problem now days the carb cleaner you buy to soak them in is not very good due to EPA bull. I have a can of Berrymans carb cleaner that I have had for well over a decade I use and it is still the good stuff. I filter it every once in a while to keep it good.
 
Does it have a ballast resistor before the coil?
If so, during cranking it is being bypassed and as soon as you release the key/start button it defaults to providing ign power through the resistor.
Does it keep running as long as you keep the starter going, then die when released.
Test for voltage both sides of resistor with ign on not during cranking.
 
(quoted from post at 18:54:43 10/20/15) Steady flow, jets are clean, got anything else? I don't know.
I got good spark, time is good, have cleaned the carburetor several times. If I choke it it starts right up sounds good,60psi oil, just won't keep running. I'm at my wits end haha.

For how long to you get steady flow? Do the plugs get wet?
 
Well if carb is clean and gas flow good then has to be a spark problem or some such thing. We have a IH 340 that ran good and all at once would not run. Found that the distributor drive gear had stripped in such a way it would turn some times and then not other times which made the timing go off. Not that it is your problem but likely to have something very odd going one if the carb is clean
 
If you have the air cleaner tube off and hold your hand on the air intake of the carb do you get a good suction and does your hand get wet with gas and also do the plugs get wet?? If no to any of those good chance you have a vacuum leak at he manifold or such in the intake
 
Well finally got it to run after cleaning the carb again. I have to have the choke on to keep it running so it still must have some dirt somewhere else in it. I got the tank out now cleaning it out some more, it must still just be dirt. Thanks everyone for all the help its been real challenge on this one.
 
(quoted from post at 20:03:24 10/26/15) Well finally got it to run after cleaning the carb again. I have to have the choke on to keep it running so it still must have some dirt somewhere else in it. I got the tank out now cleaning it out some more, it must still just be dirt. Thanks everyone for all the help its been real challenge on this one.

When you think that you have it cleaned out, check it by pulling the carb drain and catching the gas. It needs to not just run out, but to KEEP RUNNING for twenty seconds.
 

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