Ryobi 780r Carburetor Adjustment, Check Fuel Mixture, Clean Air Filter, Adjust Idle Speed Screw

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MAINTENANCE AND REPAIR INSTRUCTIONS

CARBURETOR ADJUSTMENT

The idle speed of the engine is adjustable though the Air filter/muffler cover (Fig 41).

NOTE: Careless adjustments can seriously damage your unit. An authorized service dealer should make carburetor adjustments.

Check Fuel Mixture

Old and/or improperly mixed fuel is usually the reason for the unit not running properly. Drain and refill the tank with fresh, properly mixed fuel prior to making any adjustments. Refer to

Oil and Fuel Information, Pg. 15.

Clean Air Filter

The condition of the air filter is important to the operation of the unit. A dirty air filter will restrict air flow and change the air/fuel mixture. This is often mistaken for an out of adjustment carburetor. Check the condition of the air filter before adjusting the idle speed screw. Refer to Air Filter Maintenance Pg. 24.

Adjust Idle Speed Screw

WARNING: The cutting attachment may be spinning during idle speed adjustment. Wear protective clothing and observe all safety instructions to prevent serious personal injury.

If after checking the fuel mixture and cleaning the air filter the engine still will not idle, adjust the idle speed screw as follows.

1.Start the engine and let it run at a high idle for a minute to warm up.

2.Release the throttle trigger and let the engine idle. If the engine stops, insert a small phillips or flat blade screwdriver into the hole in the air filter/muffler cover (Fig. 41). Turn the idle speed screw in, clockwise, 1/8 of a turn at a time (as needed) until the engine idles smoothly.

Idle Speed Screw

Fig. 41

NOTE: The cutting attachment should not rotate when the engine idles.

3.If the cutting attachment rotates when the engine idles, turn the idle speed screw counterclockwise 1/8 of a turn at a time (as needed), to reduce idle speed.

Checking the fuel mixture, cleaning the air filter, and adjusting the idle speed screw should solve most engine problems.

If not and:

•The engine will not idle,

•The engine hesitates or stalls on acceleration,

•There is a loss of engine power,

have the carburetor adjusted by an authorized service dealer.

WARNING: When the unit is turned off make sure the cutting attachment has stopped before the unit is set down to prevent serious personal injury.

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Contents OPERATOR’S Manual Introduction Table of ContentsSpark Arrestor California Emission RegulationsRules for Safe Operation Symbol MeaningWhile Operating While Operating with Cutting Blade Symbol Meaning Safety Alert Symbol Safety and International SymbolsFor Service INFORMATION, Call Unleaded FuelHOT Surface Warning TRIMMER/BRUSHCUTTER SafetyBrushcutters Replace dull blade Choke ControlApplications Know Your UnitFuel Cap Starter RopeInstalling and Adjusting the J-HANDLE Assembly InstructionsHandle Screws Top Clamp Middle Clamp Bottom Clamp Nuts DecalRemoving and Installing Cutting Attachment Shield Installing the HarnessRemove the Cutting Attachment Shield Install the Cutting BladeRemove the Cutting Attachment 1/2 turn Counterclockwise CounterclockwiseInstall the Cutting Attachment Remove the Cutting Blade and Install the Cutting AttachmentRemove the Cutting Blade ClockwiseUsing Fuel Additives Using Blended FuelsOIL and Fuel Information OIL and Fuel Mixing InstructionsOn/Off Stop Control STARTING/STOPPING InstructionsPartial Choke Position B Full Choke Run Choke Lever Primer BulbOperating Instructions Installing the Cutting Attachment or Add-OnsOperating the CLICK-LINK System Model 790rEach time the head is bumped, about 1 Holding the Trimmer Adjusting Trimming Line LengthDecorative Trimming Tips for Best Trimming Results Using the Cutting BladeCutting Blade Operating Tips Maintenance Schedule Maintenance and Repair InstructionsFrequency Maintenance Required Refer to Winding the Existing Inner Reel Line InstallationOuter Spool Spring Inner Reel Bump Knob Indexing TeethHolding Slots AIR Filter Maintenance Installing a Prewound ReelRemoving the Air Filter/Muffler Cover Choke Lever Partial Choke Position B ScrewsReinstalling the Air Filter/Muffler Cover Cleaning the Air FilterAir Filter Clean Air Filter Carburetor AdjustmentAdjust Idle Speed Screw Check Fuel MixtureReplacing the Spark Plug ACCESSORIES/REPLACEMENT Parts110-120 in.lb .3-13.5 Nm 020Cleaning Cleaning and StorageStorage Long Term StorageProblem Cause Action TroubleshootingEngine SpecificationsDrive Shaft & Cutting Attachment Page Owners Warranty Responsibilities Ryobi Canada INC Ryobi Outdoor Products

780r specifications

The Ryobi 780R is a powerful and reliable gas-powered string trimmer known for its exceptional performance and user-friendly features. Designed for both professionals and homeowners, this tool offers versatility and efficiency for tackling tough trimming jobs around the yard.

One of the standout features of the Ryobi 780R is its robust 30cc 2-cycle engine. This engine provides ample power to handle thick weeds and overgrown grass, ensuring a clean and precise cut with every pass. The lightweight design of the trimmer enhances maneuverability, making it easy to navigate around obstacles such as trees, flower beds, and garden furniture.

The trimmer is equipped with a premium 18-inch cutting swath, allowing for a wider range to be covered in a single pass. This feature can significantly reduce the time required to complete larger trimming tasks. Additionally, the variable speed throttle gives users the flexibility to adjust the cutting power based on the density of the vegetation, offering greater control.

One of the notable technologies in the Ryobi 780R is its Easy Start technology, which simplifies the starting process, reducing the effort required to get the engine running. This is particularly beneficial for users who may struggle with traditional pull-start mechanisms. The trimmer also features an automatic choke system, ensuring optimal engine performance in various conditions.

Another important characteristic is its dual-line feed system. The Ryobi 780R uses a bump head for easy line advancement; simply bump the head on the ground to extend the line as needed. This functionality minimizes downtime and allows users to focus on the task at hand. The dual-line setup also enhances cutting efficiency, making it a great choice for tougher vegetation.

In terms of comfort, the Ryobi 780R incorporates ergonomic handle designs that reduce user fatigue during extended use. The adjustable shaft allows for personalized length settings, catering to users of varying heights, further enhancing comfort and control. With built-in safety features such as a protective shield, users can operate the trimmer with peace of mind.

The Ryobi 780R is not just a powerful trimmer but also a thoughtfully designed tool that combines performance with user convenience. Whether you are maintaining a small garden or handling larger landscaping tasks, this trimmer offers the reliability and efficiency needed to achieve a well-kept lawn. Its blend of innovation and practical features makes it a favored choice among gardening enthusiasts and professionals alike.
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