Throttle cable doesn't give full throttle - Ryobi 150 mph 400 CFM Gas Blower Vac RY09053

if it runs good at half throttle, it just wont throttle up it sounds like the throttle cable has slipped. you might try to adjust it to get full throttle back .but if when you turn it up to full throttle and it dies then you have a choke, carburetor, fuel line, fuel filter or fuel tank problem. hope this gives you an idea.

replace the throttle spring and take the handle off and grease in there

check your throttle sensor

sounds like your choke is not opening up all the way fast easy test,take a sharpe pen and mark priar adjustment on choke cable. next; remove cable from carb,then hold chokeopen start give full throttle{no difference} carb kit

Most common mistake that I've seen that causes this problem is as follows...
Many throttle cables have 2 nuts on the threaded end that goes to the carbs...these should be fitted so that one nut is above the bracket and the other below.
If they are together above the bracket the throttle will be jammed open...

before hitting that button, give it ONE full shot of throttle, pull the choke cable all the way out, hit the button...... ONCE.... Mine starts EVERY TIME! When it is WARM, give her ONE shot of throttle, hit the button......

A two-stroke engine idles because a very small hole behind the throttle plate lets a tiny amount of gas through to keep the engine running. At full throttle the air moving through the carburator pulls gas through the venturi vaporizing it. With the motor at idle, if you give the motor full throttle very fast the first charge or two that get into the cylinder are almost completely fresh air with vary little or no gas mixed in. It takes a revolution or two for the motor to pull air through the carburator fast enough to get a fully charged mixture of gas and air into the cylinder so you get full power. This effect is especially pronounced when the motor is cold, the gas doesn't vaporize as well when the motor parts are cold. If you give it throttle slowly or let it warm up the effect should go away.

Check that the choke and throttle adjustment are synced correctly. It sounds like what happens when the choke is coming on too early in the throttle application (choke applied when in the non choke full throttle start detention). I don't have the exact method without looking it up....something like this-a pin goes through a hole in the throttle bracket to line up the throttle and choke together while you make the cable adjustment. Your engine manual should give the procedure. If that doesn't take care of it then suspect worn needle and seat on the carburetor.Hope this helped Tim

If it starts and runs fine, the first thing I would do is to check if the throttle cable sleeve has slipped where it connects to the carb. I have seen a few of these tractors where the cable was not tightened well enough and it slipped.
I don't have a picture of your actual motor. But here is a picture of the clip that holds your throttle cable tight. Follow the cable from the handle on your dash down to the motor. Find this clip on the side of the motor. Now: Move the throttle back and forth until you see how the cable moves the throttle mechanism. Does the cable extend to give the engine full throttle or shorten?
You want to move the cable so it gives the engine more throttle. I personally do this with the engine running but don't do this yourself unless you are comfortable doing so. So loosen the bolt and move it only about 1/8 inch at a time.
If you don't feel comfortable doing this call 1-800-4MY-HOME and have a Sears tech come out and work on it.
Let me know if you have any more questions.