I have a Shindaiwa weed eater 22 t while I was using it I accidentally hit the off switch when I try to start it again it wouldn't start I pulled the spark plug out to check to see if it was firing I didn't see any fire so I thought I would change the off and on switch well I did that still don't start maybe the way I checked firing was incorrect I put a test light grounding it I put a test light on the end of the spark plug and pulled a string and it wasn't firing

SOURCE: Ryobi string trimmer -weed eater pull cord hangs out wont start

What model number is your Ryobi?

SOURCE: my 32cc craftsman weed eater was running fine.when

check for trash in the carb somtimes when you run then out of gas small peices of dirt or on older motors residue builds up in gas tank and it gets sucked into the carb there should be a screen that you can clean

panilling9

• 284 Answers
• Posted on Jun 01, 2009

SOURCE: Home lite String Trimmer Won't Start

be sure your kill switch is set to run positon and the wires from it arent grounding theirself out . Make sure your spark plug is
grnded to metal when you check for spark.(ground to head away from the spark plug hole
You may have a bad ignition module if you still have no spark or the flywheel keyway has sheared for some reason throwing it out of timing.(removal of flywheel is required to see if the keyways are aligned flywheel and crankshaft)
If your flywheel seems tight then you may be ok
not a high failure rate but it has happened.Gap your plug at .030 then.025 see if that makes a difference? keep going to a smaller gap to show you may have a weak module not able to jump a wider gap.
just a couple things to check hope this helps maybe

SOURCE: My gas Craftsman Ez Fire 25cc 17 inch weed eater wont start!

Just had a similar symptom on my step-dads weedeater...... found the cylinder head loose and it had blown the gasket out. They used a very very thin gasket here.
Grab ahold of the carb and rock it back and forth a bit and see if it moves the cylinder head.

I tore it down and made my own gasket, fired right up.

Also make sure the four bolts on the side of the engine are tight that go through part of the plastic cover, there is an o-ring there.

A two-stroke crankcase needs to be completely sealed in order to run.

SOURCE: String-trimmer (weed eater) won't start.

the only thing left is the coil that is inside the cover right next to the flywheel with a gap of 10 thousand of a inch a business card will work but a new coil is almost thr price of a new trimmer unless you have a used one

Testimonial: "Thanks for the help. We did look at the coil. Got about 30 volts out of it when we pulled the starter. I hope that means it's OK."