Introduction
The Stihl BR700 is a professional‑grade backpack leaf blower known for its high airflow, low vibration, and reliable 2‑stroke engine. Whether you are a landscaper clearing large properties or a homeowner tackling seasonal debris, knowing how to start a Stihl Br700 leaf blower correctly ensures quick operation and prolongs engine life. This guide walks you through every phase—from pre‑start checks to troubleshooting—so you can fire up the unit with confidence every time.
- Understanding the Stihl BR700
- Preparing for Start
- Step‑by‑Step Starting Procedure
- Cold Start vs. Warm Start Comparison
- Troubleshooting Common Starting Issues
- Maintenance Tips for Reliable Starts
- Best Practices for Longevity
- Common Mistakes to Avoid
- Frequently Asked Questions
- Conclusion
Understanding the Stihl BR700
Engine Overview
The BR700 uses a 64.8 cc two‑stroke engine that delivers up to 912 CFM at 236 mph. Its stratified charge design reduces fuel consumption while maintaining power. The engine is mounted on a vibration‑dampening frame, which lowers operator fatigue during extended use. Understanding the basic components—cylinder, piston, crankcase, carburetor, and ignition system—helps you diagnose starting problems faster.
Key Features
- Easy‑Start system: A spring‑assisted starter reduces the pulling force needed.
- Adjustable throttle: Allows precise control of airflow for different debris types.
- Large fuel tank: 47.3 oz capacity supports long run times between refuels.
- Low‑emission technology: Meets EPA Phase 3 standards for cleaner operation.
Preparing for Start
Safety Checks
Before any start attempt, verify that the blower is on a stable, level surface and that the harness straps are securely fastened. Wear hearing protection, eye protection, and gloves. Ensure the area is clear of bystanders, pets, and flammable materials. Confirm that the throttle trigger is in the idle position and that the choke lever moves freely.
Fuel and Oil Mix
Stihl recommends a 50:1 gasoline‑to‑oil ratio using high‑quality 2‑stroke oil (Stihl HP Ultra or equivalent). Mix fresh fuel in a clean container; never use fuel older than 30 days. Fill the tank to the “MAX” line, leaving a small air gap for expansion. Using the correct mix prevents carbon buildup and ensures reliable ignition.
Air Filter Inspection
Remove the air filter cover and inspect the foam element. It should be clean, lightly oiled, and free of tears. A clogged filter restricts airflow, causing hard starts and reduced power. Clean the filter with warm, soapy water, rinse thoroughly, let dry, then re‑oil lightly before reinstalling.
Step‑by‑Step Starting Procedure
Cold Start Steps
- Set the choke lever to the full choke position (closed).
- Press the primer bulb 5–7 times until fuel appears in the bulb.
- Place the blower on the ground, hold the handle firmly, and set the throttle trigger to the “Start” detent (usually halfway).
- Pull the starter rope sharply until you feel resistance, then give a strong, steady pull. Repeat until the engine fires.
- Once the engine coughs, move the choke to the half‑choke position.
- Pull the starter rope again until the engine runs smoothly.
- Allow the engine to warm for 30 seconds, then move the choke to the open (run) position.
- Gradually increase throttle to operating speed.
Warm Start Steps
- Leave the choke in the open (run) position.
- Press the primer bulb 2–3 times to refresh fuel in the carburetor.
- Set the throttle trigger to the “Start” detent.
- Pull the starter rope once or twice; the engine should start immediately.
- If it does not start, repeat the primer step and pull again.
- Allow a brief warm‑up, then advance throttle to desired speed.
Cold Start vs. Warm Start Comparison
| Aspect | Cold Start | Warm Start |
|---|---|---|
| Choke Position | Full choke → half choke → open | Open (run) throughout |
| Primer Bulb Presses | 5–7 times | 2–3 times |
| Typical Pull Count | 2–4 pulls | 1–2 pulls |
| Warm‑up Time | 30 seconds before full throttle | Immediate throttle advance |
| When to Use | Engine cold, first start of day | Engine recently run, short pause |
Troubleshooting Common Starting Issues
Engine Won’t Turn Over
If the starter rope pulls freely with no resistance, check the spark plug for fouling or incorrect gap (0.020 in). Verify the ignition switch is in the “ON” position and that the kill switch hasn’t been engaged. A seized piston or broken recoil spring also prevents turnover; these require professional service.
Engine Starts Then Dies
This symptom often points to a lean fuel condition. Confirm the fuel mix ratio, inspect the fuel filter for blockage, and ensure the carburetor’s low‑speed jet is clean. An improperly adjusted idle screw can also cause stall; adjust per the service manual (typically 1 ½ turns out from seated). (See Also:What Size Leaf Blower For Snow)
Excessive Smoke
Blue‑gray smoke indicates too much oil in the fuel mix or a worn piston ring. Drain the tank, remix at the correct 50:1 ratio, and replace the spark plug. Persistent smoke after correct mix suggests internal engine wear—consult a Stihl dealer.
Maintenance Tips for Reliable Starts
Regular Cleaning
After each use, blow out debris from the intake screen, cooling fins, and exhaust port. A clean engine dissipates heat better and reduces carbon deposits that hinder ignition.
Spark Plug Care
Remove the spark plug every 25 hours of operation. Inspect the electrode; it should be a light tan color. Clean with a wire brush, set the gap to 0.020 in, and torque to 15 ft‑lb. Replace annually or if the insulator is cracked.
Fuel System Maintenance
Drain old fuel at the end of the season. Run the engine until it stops to clear the carburetor. Store the blower with a full tank of fresh, stabilized fuel to prevent gum formation. Replace the fuel filter annually.
Best Practices for Longevity
- Always use the recommended 50:1 fuel mix; avoid automotive 2‑stroke oils.
- Allow the engine to idle for a minute before shutting off; this clears residual fuel from the carburetor.
- Store the blower in a dry, temperature‑controlled area; extreme cold thickens oil and makes starting harder.
- Inspect the recoil starter rope for fraying; replace before it snaps.
- Schedule a professional tune‑up every 100 hours or annually, whichever comes first.
Common Mistakes to Avoid
- Skipping the primer bulb: Leads to lean starts and flooded cylinders.
- Leaving the choke closed after warm‑up: Causes rich mixture, fouling the plug.
- Using stale fuel: Results in gummed carburetor passages and hard starts.
- Over‑tightening the spark plug: Strips threads in the cylinder head.
- Ignoring air filter condition: Restricts airflow, making the engine run hot and start poorly.
Frequently Asked Questions
What fuel mix ratio does the Stihl BR700 require?
The BR700 requires a 50:1 gasoline‑to‑oil mixture using a high‑quality 2‑stroke oil such as Stihl HP Ultra. Mix fresh fuel in a clean container and use within 30 days for best performance. (See Also:How Long Does Dewalt Leaf Blower Battery Last)
Why does my BR700 flood when I try to start it?
Flooding usually occurs when the choke is left on too long or the primer bulb is pressed excessively. Follow the cold‑start sequence: full choke, 5–7 primer presses, then move to half choke after the first cough.
How often should I replace the spark plug?
Inspect the spark plug every 25 hours and replace it at least once per season or whenever the electrode shows heavy wear, fouling, or an incorrect gap.
Can I use gasoline with ethanol in my BR700?
Stihl recommends fuel with no more than 10 % ethanol (E10). Higher ethanol blends attract moisture, cause phase separation, and damage the carburetor. Use ethanol‑free fuel when possible.
What is the recommended maintenance schedule for the BR700?
Daily: clean air filter, check fuel level, inspect starter rope. Every 25 hours: clean/replace spark plug, check fuel filter. Every 100 hours or annually: professional tune‑up including carburetor cleaning, compression test, and bearing inspection. (See Also:What Is A Strong Leaf Blower)
Conclusion
Mastering the start sequence for the Stihl BR700—whether cold or warm—combined with diligent pre‑start checks, proper fuel mixing, and routine maintenance, guarantees reliable operation season after season. By following the step‑by‑step instructions, referencing the cold‑vs‑warm start comparison table, and avoiding the common mistakes outlined above, you’ll reduce downtime and extend the life of your backpack blower. Keep this guide handy, and you’ll always know exactly how to start a Stihl Br700 leaf blower with confidence.