Stihl BG66 Blower Repair Guide

The Stihl BG66 is a popular leaf blower, known for its reliable performance in tackling garden debris. However, like any mechanical tool, it can sometimes require maintenance or repair. If you're finding your BG66 isn't running as it should, understanding potential issues and the cost of repair kits can save you time and money. This guide aims to provide a comprehensive overview of common problems, diagnostic steps, and the financial outlay for Stihl BG66 repair kits.

Common Stihl BG66 Issues and Diagnosis

Leaf blowers, particularly petrol-powered ones like the BG66, can suffer from a range of problems. These often stem from fuel delivery, ignition, or air intake issues. Here are some of the most frequent culprits:

• Failure to Start: This is perhaps the most common complaint. It can be due to stale fuel, a blocked fuel filter, a faulty spark plug, or an issue with the carburettor.
• Loss of Power or Rough Idling: If the blower starts but runs poorly, it often points to a dirty air filter, a partially blocked fuel line, or an improperly adjusted carburettor.
• Engine Cuts Out: This could indicate overheating due to a blocked cooling fin, a fuel starvation issue, or a problem with the ignition system.
• Excessive Smoke: While some smoke is normal from a two-stroke engine, excessive blue or white smoke usually suggests an incorrect fuel-oil mixture or a faulty carburettor.

Diagnosing these issues often involves a systematic approach. Start with the simplest potential problems first. Always ensure you are using the correct fuel-oil mixture as specified by Stihl. Check the spark plug for signs of fouling or damage. Inspect the air filter for dirt and clean or replace it as necessary. Examine the fuel filter for blockages. If these basic checks don't resolve the issue, the problem may lie deeper within the carburettor or ignition system.

Understanding Stihl BG66 Repair Kits

When a Stihl BG66 requires more than just basic cleaning, a repair kit can be a cost-effective solution. These kits typically contain the parts most likely to wear out or fail over time. The most common and essential repair kit for a petrol-powered blower is the carburettor rebuild kit. Over time, the small diaphragms and seals within the carburettor can degrade, leading to the performance issues mentioned earlier.

What's in a Typical Carburettor Rebuild Kit?

A standard carburettor rebuild kit for a Stihl BG66 will usually include:

• Diaphragms
• Gaskets
• Needle valves
• O-rings
• Sometimes, a new fuel filter and primer bulb

These components are crucial for the correct functioning of the carburettor, ensuring the right mixture of fuel and air enters the engine. Replacing them can often restore lost power and smooth out the engine's operation.

Other Potential Repair Components

While the carburettor kit is the most common, other parts might need replacing. These are usually purchased individually:

• Spark Plug: Essential for ignition.
• Air Filter: Crucial for clean air intake.
• Fuel Filter: Prevents debris from entering the carburettor.
• Primer Bulb: Aids in starting by drawing fuel into the carburettor.
• Recoil Starter Assembly: If the pull cord mechanism fails.
• Ignition Module: Less common, but can cause starting issues.

Cost of Stihl BG66 Repair Kits

The cost of a Stihl BG66 repair kit can vary depending on the supplier, the specific components included, and whether you opt for genuine Stihl parts or aftermarket alternatives. However, you can expect the following price ranges:

Stihl BG66 Carburettor Rebuild Kit:

• Genuine Stihl Kit: Typically ranges from £15 to £30.
• Aftermarket Kit: Can be found for as little as £8 to £20.

It's important to note that while aftermarket kits can be cheaper, the quality and fit may not always be as good as genuine Stihl parts. For a reliable and long-lasting repair, investing in a genuine kit is often recommended, especially for critical components like carburettor diaphragms.

Individual Parts:

• Spark Plug: £3 - £8
• Air Filter: £5 - £15
• Fuel Filter: £2 - £5
• Primer Bulb: £4 - £10

These prices are approximate and can fluctuate. Always check with reputable Stihl dealers or online parts suppliers for the most accurate and up-to-date pricing.

DIY vs. Professional Repair

Repairing a Stihl BG66 yourself can be a satisfying and economical endeavour, especially for common issues like carburettor problems. If you are comfortable with basic mechanics and have the right tools, a carburettor rebuild kit is a feasible DIY project. Many online tutorials and diagrams are available to guide you through the process.

However, if the problem is more complex, or if you lack the confidence or tools, taking your blower to an authorised Stihl dealer or a qualified small engine mechanic is advisable. While this will incur labour costs, it ensures the repair is carried out correctly and can prevent further damage.

When to Consider Professional Repair:

• If the engine has seized.
• If there are cracks in the engine casing.
• If you suspect a problem with the ignition module or crankshaft.
• If you've attempted a DIY repair and the issue persists.

Preventative Maintenance to Extend Lifespan

The best way to avoid costly repairs is through regular preventative maintenance. This will not only keep your Stihl BG66 running efficiently but also significantly extend its operational lifespan.

Key Maintenance Tasks:

1. Fuel Management: Always use fresh, correctly mixed fuel. Avoid leaving fuel in the tank for extended periods, especially during winter storage. Consider using a fuel stabiliser.
2. Air Filter Cleaning/Replacement: Regularly check and clean the air filter. A dirty filter restricts airflow, impacting performance and potentially causing engine damage. Replace it annually or sooner if it appears worn or damaged.
3. Spark Plug Inspection: Periodically remove and inspect the spark plug. Clean any carbon deposits and check the gap. Replace it if it looks fouled, damaged, or worn.
4. Fuel Filter Check: Inspect the fuel filter for any signs of clogging or debris. Replace it if necessary, typically once a year.
5. Cooling Fins: Keep the engine's cooling fins clean and free from debris. Overheating can lead to serious engine damage.
6. General Cleaning: After each use, clean the exterior of the blower, paying attention to air intakes and exhaust ports.

Frequently Asked Questions (FAQs)

Q1: How often should I replace the carburettor on my Stihl BG66?

A1: You don't typically replace the entire carburettor unless it's severely damaged. A carburettor rebuild kit, which replaces internal wear parts, is usually sufficient to restore function. This is done as needed when performance issues arise, not on a fixed schedule.

Q2: Can I use any brand of repair kit for my Stihl BG66?

A2: While aftermarket kits are available, it's generally recommended to use genuine Stihl parts or reputable aftermarket brands known for quality. Poor-fitting or low-quality parts can cause further damage.

Q3: My Stihl BG66 is smoking a lot. What could be the problem?

A3: Excessive smoke, particularly blue smoke, often indicates an incorrect fuel-to-oil ratio (too much oil) or a carburettor that is allowing too much oil into the engine. Ensure you are using the correct Stihl 2-stroke oil and the recommended mixing ratio.

Q4: Where can I buy Stihl BG66 repair kits?

A4: You can purchase Stihl BG66 repair kits from authorised Stihl dealers, specialist garden machinery suppliers, and various online retailers. Always ensure the kit is specifically listed as compatible with the BG66 model.

Q5: Is it worth repairing an old Stihl BG66?

A5: This depends on the cost of the repair versus the cost of a new blower. If the repair is relatively minor, such as a carburettor rebuild, and the rest of the blower is in good condition, it's often worth the investment. For major engine damage, replacement might be more economical.

By understanding the common issues, the components of repair kits, and the associated costs, you can make informed decisions about maintaining your Stihl BG66 leaf blower. Regular preventative maintenance is key to ensuring your tool remains a reliable workhorse for years to come.