Ryobi s430 not turning shaft

from your description the drive cable is broken.
Good luck

Make sure that all of your fuel lines are good with no leaks and cracks. Ditto for primer bulb. If all ok, then you need to clean out carb, or get a kit for it.

Start with adjusting the carb low and high out 1 full turn, then adjust the idle.

If not a clutched model, likely the flexible drive shaft is broken. Check 1st to insure the engine head is firmly positioned into the aluminum shaft case. If it is remove at the engine, disconnect the cable as necessary and pull out the shaft for close inspection.

Ken it sounds like the shaft isn't going in to the spigot on the engine. Make sure that the head is on properly and that the shaft is in the spigot itself. If there has been any movement with the head creeping down slightly the shaft will no longer go into it. Try and straighten the shaft slightly to give a couple of millimeters more to the shaft.

hello,,There are only three things to cause trimmer head not to turn.
1.Outer shaft has sliped down from engine because screw has fallen out and ring has come loose,
2.Shaft has broken due to excess stress,such as putting on a differant trimmer head or binding up,
3.Trimmer head striped.
hope this helps,any comments welcome,thank you.

May also be the clutch, in the drive section up by the motor. You will have to take it apart to inspect it

Hi and wel;come to FixYa, I am Kelly.
The part you need is item 9 on most parts lists:

Your problem is caused by either drive shaft failure or.. clutch failure. Most of the time the drive shaft fails before the clutch.

The manual is here:
http://www.mymowerparts.com/pdf/Ryobi_String_Trimmers_Blowers_Tillers/700r.pdf

Shaft is PN 682064 or 753-04280

Sears parts direct has the shaft as item 10 this link:
http://www.searspartsdirect.com/partsdirect/part-model/Ryobi-Parts/Grass-trimmer-weed-wacker-Parts/Model-700R/0909/1503820/10060718/00002?blt=06&prst=0&shdMod=700R

Detailed view:
http://www.searspartsdirect.com/partsdirect/part-number/Ryobi-Parts/Grass-trimmer-weed-wacker-Parts/753-04280/0071/247/Model-700R/0909/1503820?keySuffixId=NA&productTypeId=x&searchModelNumber=700R&subCompDesc=Boom%20and%20trimmer&brandDesc=RYOBI&modelDesc=TRIMMER&pathTaken=partSearch&blt=11

Lower price here:
http://www.mowpart.com/p661995/Flex,-Shaft-(Rpls-682064)/product_info.html

Average price ($32.50)

Thanks for choosing FixYa,
Kelly

It is reverse threaded so you have to turn it like you was tightening it to loosen it. Clockwise looking at it from the bottom of the head. But there is a clutch that will let the whole thing turne. The best way is to remove the shaft from the weedeater and hold the shaft with some vice grips. Or you may be able to hold it right above the head, before the shaft tube.

pull the shat off the engine and check the inner shaft it sounds like its stripped or the theengine side is cracked hope this helps