Stihl HS86R Manual

The Stihl HS86R is a professional-grade hedge trimmer designed for demanding trimming tasks. It features a powerful 2-stroke engine, a robust cutting blade system with dual-sided teeth, an anti-vibration system for reduced operator fatigue, a translucent fuel tank for easy fuel level checks, and a rear handle with ergonomic controls. Below are key sections for safety, features, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: 2-stroke engine, Cutting blade with dual-sided teeth, Anti-vibration system, Translucent fuel tank, Rear handle with controls, Throttle trigger lockout, Hand guard.

Feature	Description
Engine Type	2-stroke, single-cylinder, air-cooled
Cutting Blade Length	24 inches (60 cm) dual-sided teeth
Anti-Vibration System	Reduces operator fatigue during extended use
Fuel Tank	Translucent for easy fuel level monitoring
Throttle Trigger Lockout	Prevents accidental throttle engagement
Hand Guard	Protects operator from debris and branches
Starter	Rewind starter with decompression valve
Weight (without fuel)	Approximately 11.2 lbs (5.1 kg)
Sound Power Level	Meets professional noise standards

Safety Instructions

Read all instructions before operation. Wear appropriate PPE.

1. Personal Protective Equipment: Always wear safety glasses, hearing protection, gloves, long pants, and sturdy boots.
2. Clear Work Area: Ensure no bystanders, especially children or pets, are within 50 feet.
3. Inspect Tool: Check for loose parts, damage, or fuel leaks before each use.
4. Fuel Safety: Refuel in a well-ventilated area, with engine off and cool. Use approved fuel mix.
5. Operation: Hold tool firmly with both hands. Keep balance and secure footing.

WARNING! Risk of serious injury or death from blade contact, kickback, or improper use. Never operate with one hand.

Assembly & Preparation

Unpack and inspect contents. Assemble handle and blade guard if required.

1. Attach Handle: Secure rear handle to main shaft using provided bolts and wrench.
2. Install Blade Guard: Place guard over blade when not in use for safety.
3. Fuel Mix: Prepare fuel mixture of unleaded gasoline (min. 89 octane) and Stihl 2-stroke oil at 50:1 ratio.
4. Fill Fuel Tank: Use funnel to pour fuel mix into translucent tank. Do not overfill.
5. Check Bar & Chain Oil: Ensure oil reservoir is filled with Stihl bar and chain oil.

CAUTION! Ensure all fasteners are tight before starting engine.

Technical Specifications

• Engine Displacement: 27.2 cc
• Power Output: 0.9 kW (1.2 hp)
• Fuel/Oil Ratio: 50:1 (Stihl 2-stroke oil)
• Fuel Tank Capacity: 16.9 fl oz (0.5 liters)
• Oil Tank Capacity: 6.8 fl oz (0.2 liters)
• Cutting Teeth Spacing: 0.8 inches (20 mm)
• Maximum Cutting Diameter: 0.8 inches (20 mm)
• Sound Pressure Level: 94 dB(A) typical
• Vibration Level: Front handle: 4.5 m/s²; Rear handle: 3.5 m/s²

Controls and Operation

Controls located on rear handle: Throttle trigger, Throttle trigger lockout, Stop switch, Choke lever, Primer bulb.

Starting Procedure:

1. Place on flat, clear surface. Engage chain brake.
2. Move stop switch to "I" (run) position.
3. Set choke lever to cold start position (if engine cold).
4. Press primer bulb 5-10 times until fuel is visible.
5. Hold rear handle firmly with left hand, place right foot in handle.
6. Pull starter rope briskly until engine fires. Move choke to run position.
7. Pull starter rope again to start engine. Allow to warm up at idle.

Operation: Disengage chain brake. Squeeze throttle trigger lockout and throttle to begin cutting. Use smooth, sweeping motions.

Fuel & Lubrication

Use fresh, unleaded gasoline (min. 89 octane) mixed with Stihl 2-stroke oil at 50:1 ratio.

1. Mixing: Pour exact amount of oil into clean fuel can, then add gasoline. Shake well.
2. Refueling: Stop engine and allow to cool. Clean area around fuel cap. Fill tank.
3. Bar & Chain Oil: Use Stihl bar and chain oil or equivalent. Check level frequently during use.
4. Lubrication Points: Apply grease to blade drive link as per maintenance schedule.

Tip: Never use fuel older than 30 days. Empty tank for long-term storage.

Maintenance & Cleaning

Regular maintenance ensures performance and longevity.

1. Daily: Clean air intake and cooling fins. Check for loose fasteners.
2. Blade Care: Inspect for damage or dull teeth. Sharpen with round file as needed.
3. Air Filter: Clean foam filter every 10 hours; replace if damaged.
4. Spark Plug: Check and clean every 50 hours; gap at 0.020 inches (0.5 mm).
5. Fuel Filter: Replace annually or if clogged.

CAUTION! Always disconnect spark plug wire before performing maintenance.

Storage

Prepare tool for storage if not used for more than 30 days.

1. Empty fuel tank and run engine until it stops to clear carburetor.
2. Remove spark plug and add 1 teaspoon of engine oil into cylinder. Pull starter slowly to distribute, then reinstall plug.
3. Clean entire tool, especially cutting blade. Apply light oil to blade to prevent rust.
4. Store in a dry, secure place, out of reach of children.

WARNING! Fuel left in tank can degrade and damage engine components.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine will not start	No fuel, flooded, spark plug	Check fuel level; set choke to run and pull starter repeatedly; check/replace spark plug.
Engine starts then dies	Clogged fuel filter, air filter	Replace fuel filter; clean or replace air filter.
Excessive vibration	Loose parts, damaged blade	Tighten all fasteners; inspect blade for damage or imbalance.
Poor cutting performance	Dull blade, low chain oil	Sharpen or replace blade; fill bar & chain oil reservoir.
Overheating	Clogged cooling fins, lean fuel mix	Clean cooling fins; ensure correct 50:1 fuel mix.

Reset: For electronic ignition issues, consult authorized service.

Warranty & Support

Stihl HS86R includes a limited warranty for residential or commercial use. Warranty details are provided with purchase. For technical support, genuine parts, or service, contact an authorized Stihl servicing dealer. For more information, visit www.stihlusa.com or call 1-800-467-8445.