Ryobi t430 string trimmer professional repair manual

SOURCE: Ryobi string trimmer 32.1 what do mix gas and oil or just gas?

Ryobi trimmers I have had use a 32:1 oil mix. Just pick up a little bottle of Ryobi 2-cycle oil and read it to see that it will give a 32:1 mix in a gallon of gas. Pour it into a gallon of gas, and maybe a little fuel stabilizer too, shake it up and you should be good for the season.

SOURCE: ryobi weed trimmer

I have one of this trimmers. It is simple to replace the line. 
-First line up the arrows on the bottom of the spindle. 
-Then feed the line back in one of the holes in the side of the spindle (this is the same hole that the cutting string comes out of). 
-You will see the line come out of the bottom of the spindle. 
-Take that line a place it in the hole on the bottom of the spindle. 
-Leave about 9 feet of string hanging out of the weed eater (do the same with the other side). 
-Then turn the inside wheel (I can't remember if it is clock wise or counter clock-wise but it will only turn one way) most of the string is rolled into the spindle. 
-Cut the string of about 5 inches out of the weed eater. You're ready to cut!

SOURCE: Ryobi Electric string trimmer

TJ, I've had the same problem since yesterday and I found the solution (lots of googling - that's how I found your post BTW).
It turned out that the switch malfunction is a common problem.

The part number for the FA3-4 switch is:

ut41002a-36 ("switch assembly")

Available here (thru Amazon):
http://factorylawnandgarden.com/product/553902/B000PLVCX8/SWITCH_ASSEMBLY_UT41002A_36/

It's a Homelite part, which is identical to Ryobi.

Here is the manual showing it (part 6):
http://www.m-and-d.com/pdfs/ryobi_tool/RY41002.pdf

Here is the thread with the solution:
http://www.ryobitools.com/dc/dcboard.php?az=show_topic&forum=112&topic_id=597&mesg_id=597&page=3

HTH,
Adi

SOURCE: Need routing of fuel lines on Ryobi string trimmer Model 725R.

The larger fuel line goes from fuel filter to carbuerator.The smaller line is the return line from the purge bulb tofuel tank. mitchjl_1692

SOURCE: Want manual for RYOBI 31 cc 700r weed eater

Try this link:
http://lawnandgarden.manualsonline.com/manuals/mfg/ryobi/700r_1.html

Testimonial: "Thank you! Just what I needed."