MAINTENANCE AND REPAIR INSTRUCTIONS (Continued)

CARBURETOR ADJUSTMENT

(Continued)

8.Final Idle Speed Adjustment: Adjust the idle speed by turning the idle speed screw in (clockwise) or out (counterclockwise) until the cutting head does not rotate. Do not squeeze the throttle trigger when adjusting the idle speed screw.

Definition of Optimum Setting for Idle Speed Mixture and High Speed Mixture Adjustments

Always set the idle speed mixture needle and high speed mixture needle at the optimum setting. To find the opti- mum setting, use the following instructions.

1.Turn the adjusting needle out (counterclockwise) from the preliminary setting until the engine speed decreases (rich). Note the position of the needle.

2.Turn the adjusting needle in (clockwise). The engine speed may increase, then it will decrease as the nee- dle is turned in (lean). Note the position of the needle.

3.Set the adjusting needle midway between the rich and lean settings, which is the highest engine speed (Fig. 41).

Lean

Adjust to

Midpoint

Rich

Fig. 41

NOTE: If the carburetor adjustments do not help the unit to run properly, contact your authorized service dealer.

NOTE: If the limiter caps are removed at any time, your unit will no longer meet the1995 California emission regulations and you will void the warranty.

INSPECTING/CLEANING THE MUFFLER

The muffler should be removed every 25 hours of opera- tion to inspect for excessive carbon build-up. Excessive deposits around the exhaust ports or exhaust holes will cause poor engine performance.

Use the following procedure to remove, inspect, clean and reinstall the muffler.

Removing Muffler

1.Remove the three (3) muffler mounting bolts from the cylinder (Fig. 42).

Muffler Mounting

Bolt

Muffler Mounting

Bolt

Fig. 42

2.Remove the muffler and muffler gasket. Discard the old gasket (Fig. 43).

Muffler

Muffler Gasket

Fig. 43

21

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Ryobi 990r manual INSPECTING/CLEANING the Muffler, Removing Muffler, Lean Adjust to Midpoint Rich
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990r specifications

The Ryobi 990R is a powerful and versatile cordless tool that has gained popularity among both DIY enthusiasts and professional users alike. Designed to offer convenience and efficiency, this innovative unit is equipped with a range of features that cater to different applications.

One of the standout characteristics of the Ryobi 990R is its powerful motor. With a robust design, it delivers ample torque and speed, enabling users to tackle a variety of tasks, from cutting through tough materials to drilling precise holes. The motor is powered by a high-capacity lithium-ion battery, which is known for its longevity and quick recharge time. This ensures that users can work longer without frequent interruptions, making the 990R an ideal choice for demanding projects.

Another notable feature of the Ryobi 990R is its ergonomic design. Lightweight and easy to maneuver, the unit minimizes user fatigue, especially during extended use. The integrated rubber grip offers enhanced comfort and control, allowing for greater precision when working on intricate tasks. This commitment to user comfort makes it suitable for both novice and experienced users.

The 990R also incorporates advanced technology that enhances its performance. The unit features variable speed settings, allowing users to adjust the tool’s speed according to the task at hand, whether it’s a delicate job or a high-powered application. Additionally, the tool is equipped with a built-in LED light that illuminates the work area, ensuring visibility in dimly lit spaces and improving overall accuracy.

For added versatility, the Ryobi 990R is compatible with a wide range of attachments and accessories. This allows users to customize the tool according to their specific needs, whether they require a drill, sander, or impact driver. The quick-change chuck system further enhances efficiency, enabling users to switch between accessories in seconds.

Durability is another defining characteristic of the Ryobi 990R. Constructed with high-grade materials, it is designed to withstand demanding working conditions without compromising performance. This resilience is crucial for professionals who rely on their tools for everyday use.

In summary, the Ryobi 990R stands out in the crowded tool market due to its powerful motor, ergonomic design, advanced technologies, and durability. Whether for home improvement projects or professional applications, it offers reliability and performance that users can trust. As Ryobi continues to innovate, the 990R remains a solid choice for anyone looking to enhance their toolkit.
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