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No power I have a ryobi 725r weed eater. I can get it to run, for about five sec. Run the throttle and gas just spits out the exhaust, It dies after the 5 sec run time, I tore apart the carburator and cleaned it up, still does the same thing. A little help please I have 705r Ryobi string trimmer with similar problem. Seems to have no power (does not increase rpm without stalling) and seems to be starved for fuel (only starts after being choked0) and sometimes only runs on partial choke (but still no power). I removed the carb and checked / cleaned internally as much as possible. the fuel system seems to be VERY clean, but that's only what I can see. I removed the red / white caps and adjusted both screws from zero to completely removed with no discernable change (except from zero to 1 turn which would not run at all). Is there something else to check besides the carb? All other screws are tight.

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Check for restricted exhaust next
some manufactuers put screens in their exhausts and they tend to plug up sometimes remove clean and put back screen.
When you removed carb. and dimantled were the rubber pieces soft and pliable? if they were not then consider a carb. kit
Be sure on the needle valve side of the carb. the diaphram side
the gasket goes first then the diaphram not the opposite. Zama or walbro the same deal
sometimes you have to dismantle the carb totally and drop it in carb. cleaner for awhile to allow to penetrate where its hard to clean and sometimes you have to replace the carb,but not always
the initial carb. setting for high and low is 1and1/4 turn and tweek from there.
Also the smallest pinhole in the fuel lines will create havoc also.
and if compression is weak or low the carb. will not work properly either.
Try these things and maybe it will help you some?

Posted on Jun 02, 2009

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