stihl bg km blower manual

The STIHL BG KM blower is a professional-grade combination power tool featuring a powerful gasoline engine, modular design allowing attachment of various tools (blower, trimmer, edger, etc.), anti-vibration system, easy-start technology, ergonomic handles, and a robust air filtration system. Below are key sections for safety, features, assembly, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: STIHL 2-MIX engine, modular powerhead, blower tube attachment, harness, throttle trigger, master control lever, fuel tank, and air filter cover.

Feature	Description
STIHL 2-MIX Engine	Reduces fuel consumption and emissions
Modular Powerhead	Accepts multiple attachments (blower, trimmer, etc.)
Anti-Vibration System	Reduces operator fatigue
Easy2Start™	Simplifies starting procedure
Ergonomic Handle	Comfortable grip with controls at fingertips
Throttle Trigger	Variable speed control
Master Control Lever	Combines stop switch, choke, and run positions
Fuel Tank	Transparent for easy fuel level check
Air Filter	Two-stage filtration for engine protection
Harness	Distributes weight for comfortable operation

Safety Instructions

Read all instructions before operation. Wear appropriate PPE.

1. Always wear eye protection, hearing protection, long pants, and sturdy shoes.
2. Never operate in enclosed or poorly ventilated areas due to carbon monoxide risk.
3. Keep bystanders, especially children and pets, at a safe distance.
4. Inspect the blower for damage before each use. Do not use if damaged.
5. Be aware of your surroundings and avoid blowing debris towards people, windows, or cars.

WARNING! Gasoline is highly flammable. Refuel only in a well-ventilated area with the engine stopped and cool. Do not smoke.

Assembly & Initial Setup

Assemble the powerhead with the desired attachment (blower tube used as example).

1. Attach the handle: Secure the handle to the powerhead using the provided screws and hex wrench.
2. Install the blower tube: Align the tube with the powerhead outlet and twist to lock into place. Secure with the locking lever if applicable.
3. Attach the harness: Connect the harness hooks to the designated rings on the powerhead and adjust straps for a snug fit.
4. Fuel mix: Use only 50:1 gasoline to STIHL HP Ultra 2-cycle oil. Do not use automotive oil or fuel with more than 10% ethanol.
5. Priming & Starting: Press the primer bulb 5-10 times. Set master control to choke (cold start). Pull starter cord until engine fires, then move lever to run position and pull again.

CAUTION! Ensure all fasteners are tight before operation. Keep loose clothing and hair away from moving parts.

Specifications

• Engine Type: STIHL 2-MIX, single-cylinder, 2-stroke.
• Displacement: [e.g., 27.2 cc] (Refer to specific model plate).
• Power Output: [e.g., 0.9 kW / 1.2 bhp].
• Fuel/Oil Mix: 50:1 (STIHL HP Ultra oil).
• Fuel Tank Volume: [e.g., 0.53 US qt / 0.5 liter].
• Sound Power Level: [e.g., 112 dB(A)] - Wear hearing protection.
• Vibration Levels: Front/Rear handle [e.g., 4.5/4.1 m/s²].
• Weight (Powerhead): [e.g., 10.1 lbs / 4.6 kg].
• Airflow (Blower): [e.g., 441 cfm] at [e.g., 168 mph] airspeed.
• Warranty: Limited warranty for personal use. See manual for details.

Controls and Operation

Master Control Lever: Controls stop (0), run (I), and choke/fast idle (⏚). Throttle Trigger: Variable speed. Throttle Lock: Locks trigger for continuous operation. Stop Switch: Emergency stop.

Starting Procedure (Cold Engine):

1. Press primer bulb several times.
2. Set master control lever to choke position (⏚).
3. Pull starter cord briskly until engine "fires" (usually 2-5 pulls).
4. Immediately move master control lever to run position (I).
5. Pull starter cord again to start engine. Allow to warm up at idle for ~30 seconds.

Operating: Use harness. Squeeze throttle trigger for desired airspeed. Use sweeping motions for best results.

Stopping: Release throttle, allow engine to idle briefly, move master control lever to STOP (0).

Attaching Tools & Accessories

The KM modular system accepts various tools. Ensure engine is OFF and cool.

1. Remove existing attachment: Unlock and twist counter-clockwise to detach.
2. Align new tool: Match the arrow on the tool shaft with the arrow on the powerhead.
3. Attach: Push tool onto drive shaft and twist clockwise until it clicks/locks. Engage locking lever if present.
4. Check: Gently pull on tool to ensure it is securely attached.

Compatible Attachments may include: BG Blower, KM KombiTool trimmer/edger/brushcutter, hedge trimmer, pole pruner.

Maintenance Schedule

Regular maintenance ensures performance and longevity.

Component	Before Each Use	Every 10 Hours	Every 50 Hours	Annually/As Needed
Air Filter	Visual Check	Clean*	Replace	-
Spark Plug	-	Check/Clean	Replace	-
Fuel Filter	-	-	Replace	-
Spark Arrestor Screen	-	-	Check/Clean	-
External Surfaces	Clean	-	-	-
Fasteners	Check for tightness	-	-	-
Carburetor Adjustment	-	-	-	By authorized dealer

*Clean foam filter in warm, soapy water. Rinse, dry, and re-oil with STIHL filter oil.

Fuel & Lubrication

Use fresh, unleaded gasoline with a minimum octane rating of 89. Mix with STIHL HP Ultra 2-cycle oil at a 50:1 ratio.

Mixing Instructions:

1. Use an approved fuel can. Add a precise amount of STIHL HP Ultra oil.
2. Add half the gasoline, shake vigorously.
3. Add remaining gasoline, shake again.
4. Label can clearly. Use fuel within 30 days.

Gearbox Lubrication (for trimmer/brushcutter attachments): Lubricate with STIHL gear oil during attachment changes or every 25 hours.

CAUTION! Never use fuel mix that is older than 30 days. Stale fuel causes starting and performance issues.

Storage Guidelines

For storage longer than 30 days, prepare the engine to prevent fuel system damage.

1. Run engine to empty the carburetor of fuel (or add fuel stabilizer to a full tank and run for 2 mins).
2. Allow engine to cool completely.
3. Remove spark plug, add a teaspoon of engine oil into cylinder, pull starter cord slowly 2-3 times to coat interior, reinstall plug.
4. Clean entire unit thoroughly.
5. Store in a cool, dry, and locked place, out of reach of children.

WARNING! Never store the unit with fuel in the tank indoors or in an area with open flames or sparks.

Warranty Information

STIHL Limited Warranty: This STIHL product is warranted against defects in material and workmanship for a period of [e.g., 12 months] for personal use from date of retail purchase. Warranty does not cover damage from misuse, neglect, improper maintenance, or use of non-STIHL parts/fuel. Proof of purchase is required. For warranty service, contact the authorized STIHL servicing dealer from whom you purchased the product or visit www.stihlusa.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine will not start	No fuel; flooded; spark plug faulty; master control position	Check fuel; set control to run, pull starter with throttle open (if flooded); check/clean spark plug.
Engine starts but dies	Clogged fuel filter/vent; dirty air filter; carburetor adjustment	Replace fuel filter; clean air filter; see dealer for carb adjustment.
Loss of power	Clogged air filter; dirty spark arrestor; old fuel	Clean/replace air filter; clean spark arrestor screen; use fresh fuel mix.
Excessive vibration	Loose fasteners; damaged attachment; bent drive shaft	Tighten all screws/nuts; inspect attachment/drive shaft for damage.
Blower tube detaches	Locking mechanism not engaged	Stop engine. Reattach tube and ensure locking lever is fully engaged.

For Service: All major repairs must be performed by an authorized STIHL servicing dealer. Find a dealer at www.stihlusa.com or call 1-800-467-8445.