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Ryobi 780r (41ED780G034) Handheld Trimmer Parts
How to Test a Small Engine for Spark
If your small engine isn't starting, you'll need to diagnose many issues including the spark plug. This video walks you through the steps of how to test for a spark using a spark tester.
Quick Fix: How to Clean a Spark Arrestor Screen on a Small 2-Cycle Engine
This repair article will instruct you how to repair a dirty or damaged spark arrestor on your small engine.
How to Replace the Drive Shaft on a String Trimmer
Learn how to properly replace the drive shaft on your string trimmer in less than 30 minutes.
Quick Fix: How to Replace the Spark Plug in a Small Engine
This article will help you replace the spark plug on a small engine which will help get your gas powered equipment up and running again.
Discussion for the Ryobi 780r (41ED780G034) Handheld Trimmer
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The flexible drive shaft, part number 791-181817 is 49-1/2 inches long.
Hope this helps,
Question: Fuel Tank/line
The fuel line from the tank to the primer bulb has deteriorated. Now I have a hole in the bottom of the tank where the line went inside. What part do I need and how do I install it?
Reply: Fuel Tank/line
Go to your local small engine repair shop and buy 1 foot of rubber, not plastic, fuel line, just larger than the hole. Cut the line on a diagonal and insert it from the bottom of the tank. You will need a long pair of needle nose pliers to fish it up from the filler cap. Leave about an inch in the tank.
Question: No Spark
I changed the spark plug after it quit. It ran one time then won't restart. I put a new plug in and still no spark. What do I need?
Reply: No Spark
You probably need to replace the coil.
Reply: No Spark
where (how) do I order a new coil for a 780r trimmer??
Reply: No Spark
Ryobi has a module (coil) available for a number of the 780R trimmers. A few of them are no longer available however. To see if yours is still available you will need the series number of that particular unit. That number is located on the the same white tag that the bar code is on. If you can find that number match it up with your model number. Then locate the correct parts diagram to see if that module is still available.
Question: Bump Head Assembly
I have a ten year old straight shaft Ryobi trimmer and I need the complete bump head. It's a 780r 31cc 18" #607070665 ppn501061. It still runs great and I hate to buy a new one when all I need is the bump head. Everything I try from the stores has too small of a shaft and hex nut on the shaft. Any help?
Reply: Bump Head Assembly
I have the same problem almost.On the bump head there is a knob that holds the bump head link removed side that knob is a bolt.I can not find a bolt to fit that link removed some one tell me the size?
Question: Primer Bulb Diagram
I have a Ryobi 780r trimmer. The primer bulb broke. I installed a new one but after installation, the motor starts but will not stay running. I feel like I don't have the hoses connected properly and the filter inside the gas tank broke. Any suggestions or diagrams available?
Question: Fuel Feed Assembly
Where does the fuel feed tube enter the primer? Long port or short port? Where does tube from primer attach to carburetor -- top or bottom? Where does return tube from carburetor enter gas tank? I have all of the parts on hand, but the manual does not show how to attach them. Can you provide a diagram?
Reply: Fuel Feed Assembly
I need the same information. My fuel line rotted, I replaced all of it but now it will start but not continue to run.
Question: Change A Starter Rope
How do I get to the rope assembly to replace a broke rope? The housing's are open but I can't remove the cover on the drive shaft outside the starter housing? It looks to be secured by a torx/flat screw but I can't budge it with hand strength.
Reply: Change A Starter Rope
Removal of the clutch drum isn't too hard of a project at all if you know a few tricks first. We have prepared an article and video that will provide you with all of the information you will need to remove the clutch drum. You can find the article and video at the following link...
I hope this helps you with your repair!
Reply: Change A Starter Rope
Ok this is my first time attempting to repair my weedeater. I got to the part of binding the cylinder, but I have no pull rope. That's my problem, trying to replace the starter rope. How do I do this? Thank you and GOD BLESS.
Question: Flexible Drive Shaft
Can I order just the drive shaft or do I have to order the whole upper drive shaft housing assembly?
Reply: Flexible Drive Shaft
The shaft is sold as part of the Upper Drive Shaft Housing Assembly. It is part #791-147486 and is available from http://www.ereplacementparts.com.
I hope this helps with your repair!
How do I remove the clutch cover from the clutch rotor, is there a screw that keep me from pulling cover off?
There is a screw at the bottom of the hole on the clutch drum. Removal of the clutch drum isn't too hard of a project at all if you know a few tricks first. The drum is held in place by a screw at the base of the hole on the end of the clutch drum. I believe your model of trimmer will require a Torx #T-25 driver to remove the screw but it could be a hex drive or Phillips as well. The screw will remove with a counter-clockwise rotation. When you try to rotate the screw the engine will likely rotate as well. Here is where a trick comes in. Remove the spark plug from the engine. Now find a piece of small rope, like an old shoe lace. Put the rope down in the hole for the spark plug. Be sure to leave enough of the rope hanging out of the hole so you can remove it later. The rope will bind up the piston so the engine can no longer rotate and now you can easily remove the clutch drum screw.
Good luck with your repair!
Accessories for the 780r