RY253SS Ryobi Trimmer - Instructions

Removed the 2 bolts holding the gear head to shaft. On my model I had to remove the complete trimmer head, then using 2 wrench take the trimmer head adapter off the gear heD. One video showed simply putting a screwdriver in the notch behind trimmer head and unscrewing complete head. Mine of course was slightly more involved but still quite easy once I saw what needed to be done.

It didn't, After 2 new sparkplugs 2 coils iand a fly wheel and coil set using a business card. And is killed switch disconnected? Still no spark and I don't have the clue and I'm amechanic.

Pulled trimmer apart, found plastic shims on coil broken. This allowed the coil to drop onto the flywheel, which stopped the crank and in turn sheared the flywheel key. If the key shears it will throw the timing off and the engine will not start. The key is made into the flywheel so it had to be replaced. The trimmer runs again.