My ryobi 4618 starts then dies hard to start when it eventually started its almost full throttle

SOURCE: my weed eater will start but when I push on throttle it dies

well take the spark plug out take some WD40 and give it a shot inside the unit, remember to keep the unit level when hitting the throttle and allowing it to warm up for a few minutes before use also make sure where your choke lever is. also when starting I start it on the ground like most manuals state and leave it idle on the ground for a minute before picking it up and then when I pick it up I make sure that the gas tank is tilted towards the ground so there is no room for air to get into the filter causing and disturbance while the unit is warming up.

SOURCE: Ryobi SS30 won't stay running

can be your plue

SOURCE: Engine starts but dies when I pull throttle trigger

you need to adjust the high speed needle turn it out in 1/4 increments as you throttle it, low speed may have to come out alittle but do high speed first. I had to answer this as I use to have a pastor john in sturgeon bay, miss him alot.

SOURCE: Ryobi 25cc grass timmer, cuts out when full throttle applied

check gas cap vent check ball may be stuck

SOURCE: Have changed plug and gas. hard to start but will

I would suggest cleaning the carb (remove it) and air filter. There are a few really small passages in the carb that need to be cleaned which get gummed up due to the 2 stroke mixture and sitting for the winter. (Even if you drained the fuel)

DO NOT use a piece of wire or anything to clean out any small passages. Use carb cleaner and compressed air, put it back on, and see if it's better.

If that doesn't do it, a carb rebuild is in order. Not very many parts on those little buggers. If the cleaning doesn't solve it, it's most likely a bad diaphram from sitting and drying out. (Which I'm learning towards due to the lack of pressure when you prime and having it starve for fuel and die after a minute of running). There is a square plate on the bottom of the carb held on by 3 or 4 screws. That's the cover for the diaphram. Remove the screws and plate and look at the diaphram to see if it has a hairline crack, if it's sticking (there's a spring under it), or if any thing else looks out of whack.