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I have a Ryobi 700r weedeater. Rebuilt the carb with new kit, replaced fuel filter and all fuel lines. Blew out all ventricales when I had the carb apart.
Engine will start and run for about 5 to 8 seconds but will not rap up or idle. Adjustments on the carb do not change anything at this time.
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Check the fuel/oil mix ratio you are using. Some Ryobis use a 32:1 mix and some use a 40:1 mix. There isn't much difference there. To be on the safe side, if you machine is possibly running or tuned a little "lean" I would start off with about 4 oz/gallon oil to gas mix. Use synthetic 2-stroke oil also. Your machine will perform much better.
The 700r has the fuel filter on the bottom of the tank. It is held in by the fuel hose which expands when it goes over the barbed end of the filter. To remove follow these steps: 1. Drain tank completely 2. Carefully remove the small, white, round ring that appears to be attached to the bottom of the tank with the fuel line through it. Use a small screwdriver and carefully pry it away from the tank and down the line about 1 inch. 3. Push the fuel line and filter back through the tank and exit out the fuel inlet Always replace the fuel lines with the correct lines as they are necessary to create the proper seal.
When you rebuilt the carb did you remove and replace the welch plugs. If you did not, then that is probably where your problem is. Debris, varnish and corrosion can build up under the welch plugs and the unit will not pass fuel.
Stihl weedeater was running and stopped suddenly. Put in a new fuel filter and cleaner air filter with soap and water. Checked spark plug and it appeared fine. Started the weedeater, ran for a second or so and stopped. Spark plug wasn't gas fouled. Could it be the carburetor needing new diaphram gasket and spring.
Line from tank with the filter on it is the supply line and goes to the carb inlet fitting. This is typically on the "bottom" of the carb (with the tank being up) and will usually have a fitting with barbs or a bulge on it to ensure a tight fit. The other fitting on the carb is the return line and is usually a straight tube fitting with no barbs. That line goes the suction side of the primer bulb. The third line goes from the outlet of the primer bulb to the return barb fitting in the bottom of the tank. Fittings have to be removed from tank to properly install the new hoses on them. Remove retainer ring on outide of tank and push fittings into tank, then shake out of the fill opening. More details on replacing hoses are listed in another post about Repairing Ryobi trimmer.
To leemineres, if hoses are on right and unit still stalls after starting initially you probably need to disassemble carb and clean out using spray carb cleaner. May be sticky needle valve, or partially plugged port or jet.Could also be hole in diaphragm. Gasket and diaphragm kit would be good to add when you take apart, even if diaphragm does not have a hole.
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