My Ryobi weed eater loses power at working speed after 5 minutes.

Most common problem with weed eaters is the small fuel line breaks off inside of fuel tank usually flush with top of fuel tank - check to see if fuel line is still connected to weighted fuel filter inside of tank - replace if necessary. If fuel line is intact then adjust High speed adjusting screw 1/16 counter clockwise to allow a richer mixture - special tool may be needed to adjust - available on ebay. "https://www.6ya.com/callphilipforhelp

check for debris around the cutter

I work with weed eaters and mowers. Weed eater fuel ratio is normally a 40:1 ratio. That usually all weed eaters fuel ratio.

make sure that the vent to the fuel tank is working

Sounds like you need a new spark plug and probably a new gas filter. To start the weed eater it is recommended to pump the primer bulb seven times and the choke full down. You can get the fuel filter out of the tank with a hooked wire. Good luck.

Hi Mark, I own a shop, we will not work on ryobi, have you gotten 2 seasons out of it? If so thats probably as good as it gets. But you can check carb settings. In the USA they come with limiters on the adjustment screws, not too much you can do(break them off) back your adjustments counter clockwise 1half turn.

I think a new carburetor kit and a good carburetor tune up is in order my friend. Sounds like it's starving for gas. If it bogs down after warm up when you throttle it, then yes it needs a carb tuning. The L screw is the low side screw and should be turned in lightly until it seats then back it out one and quarter turns (1 1/4). The H screw is your high speed screw. Also, turn it in lightly until it seats, then back it out approximately a 3/4 turn. With these settings the unit should start and may even stay running. Again, if it bogs when throttled, while running turn the L screw out a little more maybe only 1/16th of a turn and then try it again. If it does rev then you'll have to adjust the H screw in about a 1/16th of a turn. But make sure you only do this after the engine has warmed up.

Hope this works, good luck
Skidooer

aside from carb adfustment. remove exhaust screen and scrape off carbon with piece of wood. also repplace the fuel pickup filter in the tank. couple buck at the home depot.

A couple of things may work...
Make sure you have the correct Oil / Fuel mixture, if it is incorrect the motor may have problems running.
Also take off the bottom where the cord is wound up, make sure there hasn't been any grass get wound up inside it, this will cause it to stall out on high RPM.

What model number is your Ryobi?