Ryobi 700r 31cc 15" Trimmer,

need to relace the prime line with a longer line...

The gap for the Weed Eater 20cc engine can be set @ .025". The larger engine Ryobi 31cc/32cc class can be set @ .030" Either engine would operate within that .005" range and I know a 32cc Poulan calls for a .030" gap.

Mixture is typically 40 or 50 to 1, gas to oil. The exact mix should be stamped on the gas cap.

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

most of these use 2 wires coming out of 2 holes on opposite sides roll the firstwire clockwise, then the 2nd counterclockwise so that when the spool turns the string comes out its not hard

I got on here to find the solution for the same problem. This seems to be fairly common. I need to have it at 3/4 choke to run properly. Other posts say the exact same thing, about the 3/4 choke. It is apparenly something that breaks occationally.

I'm going to remove the carb and take it apart. My suspection is the diaphram in the bottom of the carb. There isn't much you can do with the carb, it is very simple and has few parts.

There is a chance that it is a blocked passageway also.

There are instructions for adjusting the mixture, but they are not clear enough. I will be posting a clarification reqest on one of those posts. Will also post again after I check the diaphram.

I would agree that is most likely the problem. I would just readjust.

Check the fuel lines for cracks/breaks. If they are o.k., then:

Youwill need to disassemble the carburetor and spraywith carb.cleaner. Make sure the small screen is free of debris.(Should be able to see daylight through it.) Use a Den Tek Brush, (http://www.drugstore.com/products/prod.asp?pid=165357&catid=1152),to clean the small portals in carb. These portals canbecome blocked. Reassemble and start.

If you need further assistance, just let me know.

Jim

The longest fuel line, which has the filter attached to it, goes to the brass fitting furthest from the primer bulb. The short fuel line goes directly under the primer bulb. Which hole to put it in doesn't matter if the lines are the same size. Just choose the shortest path for each. However, if the lines are different sizes, then the longest line (smallest in diameter), goes in the smallest hole of the tank.

Jim

You need to push the primer button 10 times or so (the button at the top of the speed control) to get the gass pumped up into the system again. Likely gas not getting through the line yet. Takes awhile.