echo cs600 won't do anything except idle

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Coils do some dumb stuff like this every once in awhile.. Gotta discern which it is then report back.

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These types of problems can drive a person nutty but there is a reason it's running bad and eventually you will find it. The saga being posted here will likely help someone else out someday.
 
I've had spark plugs and tank vents whip me for days on end. I got so frustrated with a ms290 I set it down for two months time then worked on a buddies ms360 and the light bulb finally went that they both needed vents..

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Pulled Welch plug out. Had to drill to get it out. There was nothing laying in there. The holes are clear through to the carb body... My only question right now is do I have the carb screws correct? H and L? Or backwards?
 

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On most carbs the L screw is longer. So I'd say you have them correct. I usually put them in a little labelled baggie when I disassemble the carb. On some carbs the threads are two different diameters so there's no chance of mix up...
 
Flywheel is in correct spot.. Check out the top of the piston.. Strange??
 

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Those are the idle jets under that welch plug - the idle worked so I'm not sure of the reason for opening that up?
 
Did you say the carb was rebuilt? Good chance that if there is gasket material stuck to a carb body means it's been in the carb a while. If the check plate diaphragm and fuel pump diaphragm could be dried out. If you used carb n choke cleaner on ur carb parts they could have really dried out fast. Only thing I use on diaphragm carbs is disk break cleaner, imo I think it's easier on rubber and evaporates quick
 
I wouldn't say that the idle worked.
I went back and read the initial description:

It won't do anything but idle. Give any gas at all and it dies.
So if you crack the throttle even a little it dies?

If you look at the 3 holes under the plug, the left is the idle outlet. The two on the right are the transfer outlets:

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Walbro shows those as being fed downstream of the L needle:


HDA-PartThrottle.jpg
However, this HDA is built different from older ones I've seen. Still, determining if it dies on the transfer outlets or the main (H) outlet will help point you to the problem.

On yours the H is mostly a fixed jet with the H needle providing additional fuel.
 
barely crack it... just a simple tap and dead...

i removed the tank vent completely and still same issue as well...
 
barely crack it... just a simple tap and dead...

i removed the tank vent completely and still same issue as well...
Well then, as you can see the transfer outlets are fed from the same well as the idle outlet, and it will idle. That idle well is downstream from the L needle.
So I would be looking as something whereby the carb can only supply enough fuel to feed the idle but not enough above that.

This could be due to an incorrectly set metering needle not allowing enough fuel flow into the metering chamber.

Or it could be an air leak into the metering chamber small enough that with help from the fuel pump at idle it can supply enough fuel, but once the draw on the metering chamber increases is just too lean. Possibilities are a hole in diaphragm, poor seal at edge, or maybe a leaking check valve on the main jet. If it were the main check valve then it should run at wide open if you can get it past the off-idle cut out. Try holding it partially choked and see if you can get it to rev up.
 
I don't know if I'm sipping on to much coffee. But that carb on other documents looks like a accelerator pump carb. Those have caused many issues on other walbro carbs in the past when the o ring goes bad. Sucks air leans out saw and inconsistent idle and tuning
 
It was a new carb kit with about 5 hours on it.. But was about a year ago it was installed. Gt to get a new Welch plug and OEM carb kit and give it one last go before I throw the carb in the river.
 
It was a new carb kit with about 5 hours on it.. But was about a year ago it was installed. Gt to get a new Welch plug and OEM carb kit and give it one last go before I throw the carb in the river.
if you only have that short of time on it and it sat that long it is a very good chance the diaphrams dried out,, get a NEW kit and put in it,,, turn your mixture screws out 1 full turn and run it
 
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