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Repair Parts Home    Lawn Equipment Parts    Ryobi Parts    Ryobi Trimmer Parts    Ryobi 990r (411088141) String Trimmer Parts
Ryobi 990r (411088141) String Trimmer

 Ryobi 990r (411088141) String Trimmer Parts

Engine Assembly
Clutch / Starter
Upper Shaft Assembly
Lower Shaft Assembly
   Engine Assembly   

 Fig # Part # Img Part Name Availability Price Qty
A1791-181043
Screw, Muffler Mounting
Backorder:
No ETA.
 $3.73
A2791-181044
Screw, Muffler Mounting
Backorder:
No ETA.
 $4.28
A3791-180890
Spark Arrestor Screen Obsolete - Not Available
Discontinued
N/A
A4791-181045
Screen Cover
Backorder:
No ETA.
 $3.27
A5791-181046
Screw
In stock
1 available
 $1.86
A6791-181047
Muffler
Note: Includes Items 1-5 And 7.
In stock
1 available
 $45.76
A7791-181048
Muffler Gasket
In stock
6 available
 $2.52
A8791-181049
Baffle, Muffler
Ships in 5 - 7 business days
 $5.76
A9791-181050
Screw, Air Filter Cover
In stock
2 available
 $3.69
A10791-181051
Cover, Air Filter Obsolete - Not Available
Discontinued
N/A
A11791-180350B
Air Cleaner Filter
In stock
25+ available
 $5.78
A12791-181052
Screw, Air Filter Base (52.5Mm)
Ships in 5 - 7 business days
 $1.91
A13791-181053
Screw, M5 X 29Mm
Backorder:
No ETA.
 $1.91
A14791-181538
Primer and Line Assembly
In stock
13 available
 $17.14
A15791-181055
Base, Air Filter
Ships in 5 - 7 business days
 $14.65
Fig #Part #ImgPart NameAvailabilityPrice
A16791-181056
Gasket
In stock
2 available
 $4.38
A17791-181057
Lever, Choke Obsolete - Not Available
Discontinued
N/A
A18791-181058
Carburertor W/Choke Lever Obsolete - Not Available
Discontinued
N/A
A19791-181059
Gasket
In stock
3 available
 $5.56
A20791-181060
Insulator, Carb Mount Obsolete - Not Available
Discontinued
N/A
A219072
Nut
Ships in 5 - 7 business days
 $3.38
A22791-181061
Gasket, Intake
Ships in 5 - 7 business days
 $3.92
A23791-181062
Baffle, Intake
Ships in 5 - 7 business days
 $4.15
A24791-181003
Screw (M5 x 18.7mm)
In stock
3 available
 $2.34
A25791-181063
Housing, Fan
Ships in 5 - 7 business days
 $30.96
A26791-181064
Tinnerman Nut Obsolete - Not Available
Discontinued
N/A
A27791-181065
Spacer Obsolete - Not Available
Discontinued
N/A
753-05240
Flywheel Assembly
In stock
25+ available
 $41.52
791-153624
Flywheel Obsolete - Not Available
Discontinued
N/A
A29791-181066
Screw
Ships in 5 - 7 business days
 $3.42
Fig #Part #ImgPart NameAvailabilityPrice
A30791-611063
Ground Tab
Ships in 5 - 7 business days
 $8.24
A31791-181067
Module, Ignition Obsolete - Not Available
Discontinued
N/A
A32791-181094
Lead, Wire 18"
Note: Two Required.
Ships in 5 - 7 business days
 $5.65
A791-610676
Key
Backorder:
No ETA.
 $2.48
A791-181068
O.E.M. Carburetor Repair Kit
In stock
6 available
 $41.03
A791-181069
Gasket-Diaphragm Repair Kit (Walbro)
In stock
3 available
 $23.07

Enter your engine's type number in this search field to show the parts that match your engine.

Your engine's type number is the second part of the model number stamped on your Briggs & Stratton engine (see picture).

Trimmer Parts

Repair Articles

How to Test a Small Engine for Spark
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
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
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
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.
Repair Stories
Symptom:
Primer Bulb Worn Out
Parts Used:
Part Number:
Repair Difficulty:
Easy
Time Spent Repairing:
15-30 minutes
Tools Used:
Entry Date:2014-06-06 10:14:23
1 of 2 customers found these instructions helpful
Primer bulb w/ fuel lines
Watch the video on eReplacementParts!!!!
It makes the repair go smooth! http://www.ereplacementparts.com/article/4262/How_to_Replace_a_Primer_Bulb.html
Did these repair instructions help you?
Discussion
Discussion for the Ryobi 990r (411088141) String Trimmer

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1302529
Question: Ryobi 990r Fuel Tank

1302529

My Ryobi 990r fuel tank part no. 791-181082 has cracked, the part list shows not available. Does anyone know of a fuel tank that may work. Have too many attachments to trash.
1198294
Question: 990r

1198294

need walbro carb for above
1159909
Question: Ryobi 990r Fuel Line Routing

1159909

I have a Ryobi 990r which had all of the fuel lines deteriorated and missing. I replaced the fuel lines and connected then to where i felt with no help. I have tried several different routines of the lines that I got off of the Internet with no help. The unit will run shortly at full choke then stalls. Can anyone tell me the correct routing of the fuel lines from the tank to the Primer Bulb. and Carb. Thanks in advance.
WJA
Reply: Ryobi 990r Fuel Line Routing

WJA

Hello 1159909,

We have prepared an article and video on this subject. Here is the link to it.

How to Replace Fuel Lines on 2 Cycle Engines

Hope this helps,
-WJA
jJim
Question: 990r Ignition Moduel

jJim

does anyone have an ignition moduel for my 990 r ? if not I have the complete power unit for sale, all or part, your choice \. 4252389555.
Brucer
Reply: 990r Ignition Moduel

Brucer

How much will you sell your power head for and ship to SLC Utah?
650935
Question: Ryobi 990r

650935

What is the compression for the ryobi 990r 4-cycle string trimmer.
echojoe1
Question: 990r Fuel Tank

echojoe1

can someone please tell me where i can find a fuel tank for a ryobi 990r brushcutter
thanks joe
steve66396
Reply: 990r Fuel Tank

steve66396

I have one on ebay right now. item # 180917937248.
jJim
Reply: 990r Fuel Tank

jJim

I have a fuel tank that is good, the fuel lines need replacing but the tank is good.4252389555
My Ryobi 990r 4-cycle string trimmer runs fine, however the trimmer head spins fast even at idle. I've backed off the throttle screw all the way, head still turns. I've been playing with the air fuel mix to reduce the idle speed and the head still turns fast. Could this be a clutch problem? I really need to get the head to stop spinning when I release the throttle trigger, any suggested appreciated.
Are there kits for these carbs?
jJim
Reply: There Are No More Carburetors 79...

jJim

I have a good carb for the 990 r if you want it. 4252389555
JBT
Question: RETAINER REMOVAL

JBT

HOW DO YOU REMOVE RETAINER THAT HOLDS HEAD ASSY RETAINER IS ON SPOOL SHAFT.
fracing
Question: Throttle Cable

fracing

has anyone found a suitable replacement for this ?
abuream
Reply: Throttle Cable

abuream

I need to know the same thing . Need a replacement part .
steve66396
Reply: Throttle Cable

steve66396

I have one on ebay right now. item #110905003472 .
jJim
Reply: Throttle Cable

jJim

I have an original cable if you need it. 4252389555. its in great shape.
larryladue
Reply: Throttle Cable

larryladue

Same here need a throttle cable for the trimmer.
RaymondB
Question: Gas Lines For Ryobi 990r

RaymondB

Looking for a digram showing the gas lines. Showing where the lines hook up and were they go.
UtahAV
Reply: Gas Lines For Ryobi 990r

UtahAV

Hi RaymondB,

The fuel system on your trimmer has a filtered inlet that goes to the input tube of the carburetor. The other hose on the carb is the priming hose. It runs from the carb outlet to the input, or suction side, of the primer bulb. The last line runs from the output side of the primer bulb back to the fuel tank. It is the return line.

When you prime your saw the primer pulls filtered fuel into the carb, to the primer bulb and then returns excess back to the tank. To find the suction side of the primer bulb, attach a piece of fuel line to one side of the primer. Now put the line in a small container of fuel. If you see bubbles when you press the bulb, the hose is hooked to the outlet side of the primer. If it sucks fuel into the bulb then you have found the suction side.

Identifying the input and output side of a carb that has a remote priming assembly can be very difficult and there is no rule that applies in every case. Usually you just need to use trial and error on those connections. If you have hooked everything up so you are pulling fuel through the carb, not pushing it into the carb, and your trimmer won't fire, you should just need to swap the lines on the carb and then it should run fine. The important thing is that you have the priming lines setup to pull fuel through the carb.

I hope this helps!

-UtahAV
-Mark
Dave
Question: Weed Eater Repair

Dave

Weed eater will start and run for 10-15 minutes then will just die. Will restart after several pulls, then runs for another 5-10 minutes then dies again. I've had it in shop and they can't fix it. This is very aggravating. Model # is 990r. Please help!
raymond
Reply: Weed Eater Repair

raymond

Try to balance the carb setting and choke. I had same problem with my 990 before I needed my part; it took a while but balanced out in the end. I hope this helps you. --Dave
raymond
Question: 990r Plastic Sleeve /spacer

raymond

I am having a big problem locating a dealer who can supply me with the plastic tube/sleeve that goes between the spacer and the retainer wheel on my Ryobi 990r brush cutter/trimmer. I would be very grateful for any information on this matter. Yours, Raymond Differ
raymond differ
Question: I Have A Ryobi 990r Trimmer Brus...

raymond differ

I can't get a part for my recoil wheel; it is the plastic tube that holds it steady, and I can't find any tube that will substitute. Can you help?
Can I take out the bubble without removing the primer lines?
Al
Question: Won

Al

I have an 990r gas powered trimmer, 4 cycle engine which is about 10 years old. It will start on full choke but as soon as I move the choke lever it dies. I have put in fresh gas and run stabilizer in the fuel.
Doug S.
Reply: Won

Doug S.

The fuel lines on this machine have a tendency to dry out and crack. There's a good possibility that your sucking air into your fuel line somewhere between the tank and the carb.
You may also want to check the carb mount to the engine. Tighten all the fasteners, and see if that helps.
john
Question: 990r How Many Cc

john

Does any one know how many cc the 990r engine has? I am thinking about using my motor for another project but can't seem to find the size.
thanks
Tony
Reply: 990r How Many Cc

Tony

It is 26.2cc engine series 4026u1g4raegr
lawrence gibson
Reply: 990r How Many Cc

lawrence gibson

26.2cc
fred
Question: Flex Drive

fred

I have a brushcutter, Ryobi 990r ser. 704208498. I'm looking for the upper flex drive. Is the part #791-181092?
Mark
Reply: Flex Drive

Mark

Hi Fred,

You are correct. It is part #791-181092. It includes both the drive shaft and the housing. The Upper Shaft and Housing is available from http://www.ereplacementparts.com.

Good luck with your repair!

-Mark

carl
Question: Clutch Removal

carl

I have a model 990R ryobi 4cycle weedeater motor. i have taken it apart far enough to be looking at the clutch assembly and the end of the motorshaft. In the castings on the face of the clutch there is an arrow pointed ccw and the word 'off' above it. Is the output shaft of the motor threaded? /
stuffing the cylinder head full of string is a great idea to keep the engine from turning.....
Mark
Reply: Clutch Removal

Mark

I don't believe that the output shaft is threaded. There should be a screw in the bottom of the hole on the clutch drum. I haven't worked with this specific model of trimmer much but on all of the other Ryobi trimmers the clutch drum is held on in this way.

I hope this helps!

-Mark
steve66396
Reply: Clutch Removal

steve66396

Check out ebay item #110907521241. It's an engine I have for sale you can see the shaft where the clutch goes is threaded.
carl
Question: Clutch Removal

carl

I have an older model 990R , how do you remove the centrifugal clutch??? Do I need to open the oil reserve to keep it from spinning while I turn the clutch?
Mark
Reply: Clutch Removal

Mark

Hi Carl,

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!

-Mark
carl
Reply: Clutch Removal

carl

I have the clutch drum off. am trying to get the clutch off of the motor shaft. Does it just unscrew from the motor shaft?
steve66396
Reply: Clutch Removal

steve66396

It unscrews off of the shaft. Check out ebay item #110907521241. It's an engine I have for sale you can see the shaft where the clutch goes is threaded.
carl saunders
Question: Ryobi 990R Gas Trim.

carl saunders

I have the replacement primer/fuel line. But do not know how to re-pipe it. Have three different fuel lines and do not know where they go. I need advise on installation or diagram.
I had removed the old one before getting the replacement.

Patrick
Reply: Ryobi 990R Gas Trim.

Patrick

link removed

I hope this helps you out!

Patrick
cookie
Reply: Ryobi 990R Gas Trim.

cookie

I need a diagram for routing gas hoses.
I don't see this model listed on your site, but that's what it says on the case. The fuel lines on this 4-cycle trimmer/brushcutter have exceeded their useful life. I tried replacing with generic lines, but they don't fit correctly and leak. The primer bulb has lost enough flexibility that it is probably not going to survive long. Have you parts available to replace these?
Michael
Reply: Ryobi 990r Primer Bulb And Fuel ...

Michael

I've added the Ryobi 990r to our site, and the Fuel Line and Primer are available. You can find the breakdown page here:

Ryobi 990r Parts List and Diagram

The primer assembly is part number 791-181538, and you can find it here:
791-181538 Primer and Line Assembly - $13.40

The fuel return line is part number 791-181086 - $3.03. You can also get it in an assembly with a filter - 791-181085 Fuel Line Assembly W/Filter - $8.60

I'd still recommend taking a look at the breakdown page to make sure you're getting exactly what you need, but it sounds like those should get you covered.

Hope this helps!
jp2code
Reply: Ryobi 990r Primer Bulb And Fuel ...

jp2code

Wa-Hoo!

I love forums. This was the part I needed!

I hate reviving old threads, but this is exactly the item I am servicing.

I replaced my fuel lines with standard lines a couple of years ago, and (like the original poster said) they leak like mad!

My bulb just broke as well, so I thought this expensive tool was going to have to be junked.

Is there a general "service kit" for this item?

link removed
Michael
Reply: Ryobi 990r Primer Bulb And Fuel ...

Michael

No worries on bringing this old thread back from the dead. The more information we can pack into these things, the better.

The parts I mentioned above should cover everything you need:

Fuel Line Assembly W/Filter [791-181085] - $9.46 at eReplacementParts.com
Primer and Line Assembly [791-181538] - $13.40 at eReplacementParts.com
Fuel Return Line [791-181086] - $3.36 at eReplacementParts.com

The primer bulb assembly includes two fuel lines, but the return line included with it may not be long enough to reach back to your fuel tank. I'd suggest picking up the separate fuel return line just in case.

There's also an OEM Carburetor Repair Kit listed for that tool, which will include things like the internal gaskets, reed valve, diaphragm, needle, filter screen, etc. It won't include the specific items you're asking about, but it's as close as it gets to a general service kit.

By the way, that's a great picture of your trimmer. How would you feel about us featuring it on our 990r breakdown page?
ashton
Reply: Ryobi 990r Primer Bulb And Fuel ...

ashton

Gotta love these sites and please keep up the good work! Just ordered my lines for my tank after finding they do not sell the tanks any more.
maniac
Reply: Ryobi 990r Primer Bulb And Fuel ...

maniac

i recently changed the fuel line from the tank to the engine. after doing so the motor ran fine for half an hour then stopped suddenly, noticed a gas leak from the bulb which i need to replace but also oil leaking from under the cover over the bulb/carburator. Any ideas what the connection is and what I may need to replace to fix it?
Accessories
Accessories for the 990r

Mix Oils:
See more mix oils 
T-00745
2-Stroke Oil w/ Stabilizer 50:1 Ratio 2.6 fl.oz
$3.33

6450001
Power Blend Ultimate 2-Stroke Oil 2.6 oz.
$2.55

6450025
Power Blend Ultimate 2-Stroke Oil 6.4 oz.
$3.43

fancyboxy