Stihl KM 91 R Instruction Manual

Pages 72

Year 2020

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Stihl KM 91 R Specification

The Stihl KM 91 R is a versatile and robust powerhead designed for demanding professional and residential landscaping tasks. It features a 28.4 cc 4-MIX engine, delivering a blend of power and efficiency while maintaining low emissions and reduced noise levels. This innovative engine technology combines the benefits of a two-stroke and four-stroke engine, providing excellent torque and acceleration while ensuring fuel efficiency and easier maintenance.

The KM 91 R is part of the Stihl KombiSystem, allowing users to switch effortlessly between a variety of attachments, such as trimmers, edgers, and blowers, making it ideal for diverse landscaping needs. Equipped with a simplified starting procedure, it includes a semi-automatic choke lever and a decompression valve for easy engine starting, even in cold conditions. The ergonomic loop handle design enhances comfort and control, reducing operator fatigue during extended use.

Featuring a straight shaft, the KM 91 R offers superior reach and precision in trimming and edging tasks. Its quick-release coupling mechanism allows for seamless attachment changes without the need for additional tools, enhancing productivity and versatility. The unit is also equipped with a multi-function control handle, integrating all essential controls into one easy-to-access location.

Weighing approximately 4.4 kg (9.7 lbs) without any attachment, the KM 91 R balances power with maneuverability, making it suitable for a wide range of landscaping applications. The fuel tank capacity of 710 cc ensures extended operation between refills, enhancing efficiency on the job. With its combination of advanced engine technology, user-friendly features, and compatibility with multiple attachments, the Stihl KM 91 R stands out as a reliable and adaptable tool for professional landscapers and homeowners alike.

Stihl KM 91 R F.A.Q.

How do I start the Stihl KM 91 R for the first time?

To start the Stihl KM 91 R, ensure the machine is on a flat surface. Set the choke lever to the cold start position, press the fuel pump bulb until you see fuel, and pull the starter grip slowly until you feel resistance, then pull quickly. Once the engine starts, move the choke lever to the run position.

What type of fuel should I use for the Stihl KM 91 R?

The Stihl KM 91 R requires a 50:1 ratio of unleaded gasoline and STIHL two-stroke engine oil. Ensure the gasoline has an octane rating of at least 89.

How often should I clean the air filter on my Stihl KM 91 R?

Clean the air filter after every 25 hours of operation or sooner if you notice a decrease in engine power. Use warm soapy water, rinse, let it dry, and apply a small amount of air filter oil before reinstalling.

What should I do if the Stihl KM 91 R engine won't start?

If the engine won't start, check the fuel supply, ensure the spark plug is clean and functioning, and verify that the air filter is not clogged. Make sure the choke is set correctly and the fuel is fresh.

How do I replace the spark plug on my Stihl KM 91 R?

To replace the spark plug, first ensure the engine is cool. Remove the spark plug boot, use a spark plug wrench to unscrew the old plug, and replace it with a new one recommended by Stihl. Reattach the spark plug boot securely.

Can I use attachments from other manufacturers with the Stihl KM 91 R?

It is recommended to use only genuine Stihl attachments with the KM 91 R to ensure compatibility and optimal performance. Using non-Stihl attachments may void the warranty and cause damage to the unit.

How do I store the Stihl KM 91 R for an extended period?

Before storing, clean the unit thoroughly, drain the fuel tank, and run the engine until it stops to clear any remaining fuel. Store the unit in a dry, clean area away from direct sunlight.

What maintenance should be performed regularly on the Stihl KM 91 R?

Regular maintenance includes checking and cleaning the air filter, inspecting the spark plug, lubricating the gearbox, checking the fuel system for leaks, and cleaning the cooling air intakes.

How can I improve the performance of my Stihl KM 91 R?

To improve performance, use fresh, high-quality fuel, regularly clean or replace the air filter, ensure the spark plug is in good condition, and follow all recommended maintenance schedules.

Are there any safety precautions I should take when using the Stihl KM 91 R?

Always wear appropriate personal protective equipment such as gloves, eye protection, and hearing protection. Be aware of your surroundings to avoid hazards, and never operate the unit indoors or in poorly ventilated areas.