How to Replace a Primer Bulb
Replacing primer bulbs in small engines is one of the most common types of tool repairs, and this article explains professional steps for primer bulb replacement in two engine design types.
How to Replace Trimmer Fuel Lines
Grass trimmers commonly need their fuel lines and other system comenents replaced, and this article offers professional repair advice for performing a trimmer fuel line replacement.
Discussion for the Ryobi 890r (41AD890A734) Handheld Trimmer
Engine runs great, but about half way through trimming the string head quit turning and when I shut it off it sounds like the flex shaft or clutch drum keeps spinning. I am guessing that it's the clutch , any thoughts ??
I tackled this job with the help of the video on disassembling and cleaning the carb.
WATCH THE VIDEO.
A couple of points:
The primer bulb is not included in this kit... you think it would be since the screws that hold it on hold whole stack of carb parts together. So buy that too.
DONT THROW ANYTHING OUT as you disassemble the carb. There are more gaskets in the kit than you need. You have to match the old one to the replacement from the kit.
The kit surprisingly doesn't contain the spring for the needle vale, don't let that go boing when you disassemble
WATCH THE VIDEO.
Note that the diaphragms stick to the gasket they're stacked with... looks like one part when you take it apart but you must match a gasket to the diaphragm and stack them in the same order they came off. Use the old parts you took off to match the new gasket.
WATCH THE VIDEO.
They're not joking when they say be careful to not splash the carb cleaner back in your eyes.
My pull rope broke, I have taken the trimer apart and there is no way to restring the rope? Do i have to buy a new pully or starter assembly. And it dose not say what you get with a new starter assembly ?
I think you needed to turn the pulley that the rope was wrapped around counter-clockwise about 4-5 times, or until you feel the recoil spring that's underneath that pulley, feel like it has tension on that spring. You need to hold that pulley so it doesn't retract until you string the rope through the hole in the pulley. Once you have the rope strung through, then you slowly release pressure off that pulley. That will start to retract the rope and give you the tension you need. At least that's how I performed the task and it worked for me.If you're not getting any tension when turning the pulley counter-clockwise, then you probably have a broken recoil spring lip, or that lip came out of the hole where it needs to be inserted.
We have prepared an article and video that I hope will help you with your trimmer repair. Here is a link to it.
When replacing the primer bulb several parts of the carburetor came off. I thought I put them back on the correct way but now all the trimmer will do is idle. When I give it gas to start trimming it dies. Should I replace the whole carburetor kit?
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...
When I opened the throttle trigger housing on my Ryobi 890r, the spring fell out. Do you have anything that shows the proper orientation of the spring with regard to the trigger and interfacing parts? It's somewhat a puzzle and I haven't figured it out yet?
My trimmer has been put up all winter. It was hung vertically on a wall with the engine at the top. The unit is about 3 years old. I took it down and it started right up with very black oil dripping out all over the place. I shut it down and checked the oil chamber. It would seem that a gasket/seal/bearing is leaking? Can it be fixed or is it destined for the trash?
Richard, I've found crankshaft seals can go bad and when hung for periods of time with the engine on top, the oil can seep past the seal and run down the shaft. Thoroughly clean the trimmer and try to determine the source of the leak and possibly store it in the horizontal position, keeping the oil in the bottom of the crankcase if the crankcase/shaft seal is worn.
Reply: Oil Leak
Richard, you may also want to check all torx screws to be sure they're tight. They have a tendency to loosen on 4 stroke motors, especially the 4 screws that hold the cylinder to the block.
I am not certain on the Model #890r trimmer but on many trimmers the flywheel seats onto a taper on the crankshaft. You can usually remove the flywheel by appling a bit of leverage from below with a large screwdriver and then strike the end of the crankshaft with a rubber mallet.
Hi, i have a Ryobi brushcutter 890r a friend gave it to me said it didn't run(what a great friend) i got it running (just needed new fuel lines and a new primer bulb),but dose not have much power at all. and wont idol. Dose any one know what i can do to fix these problems? thanks
Raptor, remove the aircleaner and when the throttle is wide open (revving up) see if you feel fuel/air spitting out from the carburetor throat. if so, you need to remove the cylinder/head and the valves and clean the carbon from the valves and valve seats. This can be done with a bench grinder wire wheel on the valves,and a plumbers fitting brush for the valve seats and combustion chamber. When they carbon up, you lose compression and power. Be very careful removing the cylinder, as the gasket is very thin and fragile and will probably have to be replaced.