HELP! 572 idles bad and won’t rev up

[Yellowking86]

I bought a 572 on marketplace and it idles if I press the throttle slightly but won’t rev up at all and seems like it floods at idle and does. I put a new carb rebuild kit in it and spark plug and filter.

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[huskihl]

Couple things. Check the plug and wire. Make sure the crank case bearings are good so that the flywheel can’t wobble. Check the blue and red ignition wires from the coil to the carb for breaks or shorting out against the casting. Remove the flywheel and make certain the key isn’t sheared. If those are good, it’s possible that the nozzle in the venturi is bad and it’s also possible that the coil is bad

 

[Yellowking86]

I will check those thank you

 

[Poleman]

I would check and clean the carb first. If it’s a used saw the inner screen is probably dirty. I’ve see a lot of fines getting through the filter in those saws. In doing that you will be separating connections make sure they’re clean. Also like mentioned check crank bearings and seals, especially if the saws has a lot of use. I’ve seen three recently with bad bearings which took out the P/C and spun bearings in the case.
Big three… dirty carb, bad coil, bearings and seals on those saws. I’m dealing with Loggers saws that very little maintenance, poor fuel and run hard ever day.

 

[Yellowking86]

Bearings seem fine, I cleaned the carb and out a new diaphragm in it. I checked to e flywheel for a sheered key. Maybe it’s the nozzle. Seems like it loads up at idle and dies and when I pull the throttle all the way it makes and awful sound.

 

[Yellowking86]

Did you pull the H&L needles and inspect them, as well as their seats?

I did not, I will check those out thank you

 

[srcarr52]

Did you pull the H&L needles and inspect them, as well as their seats?

It's an Autotune saw, there are no H&L screws.

 

[Yellowking86]

the carb won’t hold pressure, sounds like it’s coming from the nozzle?

 

[EFSM]

the carb won’t hold pressure, sounds like it’s coming from the nozzle?

The metering chamber should not have pressure in it when testing. If it does, then the needle is leaking. Make sure you have the tester hooked up to the pickup fitting.