Bolens 2 Cycle Trimmer

After fifteen years of battling with unruly grass and weeds in my suburban yard, I’ve become something of a lawn equipment enthusiast—or obsessive, as my wife likes to call it. When I first purchased my Bolens 2 Cycle Trimmer, I was admittedly clueless about proper operation and maintenance. Fast forward through countless Saturday mornings, YouTube tutorials, and conversations with hardware store employees, and I’ve developed a deep appreciation for this reliable yard companion. Today, I’m sharing everything I’ve learned about getting the most from your Bolens trimmer, from basic operation to troubleshooting and maintenance.

Understanding Your Bolens 2 Cycle Trimmer

Before diving into operation and maintenance specifics, let’s take a moment to understand what we’re working with. A Bolens 2 cycle trimmer is a gas-powered string trimmer designed for residential and light commercial use. The “2 cycle” (also called “2 stroke”) refers to the engine type, which completes a power cycle in two piston movements rather than four. This design creates a relatively lightweight yet powerful tool that’s perfect for tackling overgrown grass, weeds, and even light brush.

The advantage of a 2 cycle engine is its impressive power-to-weight ratio. The most important thing to remember about a 2 cycle trimmer is that it requires a specific mixture of gas and oil to function properly. Unlike your car or a 4 cycle engine where oil and gas are kept separate, a 2 cycle engine requires pre-mixed fuel. This single detail is responsible for more trimmer problems than perhaps any other factor!

When I first brought my Bolens home, I was impressed by its ergonomic design and balance. The curved shaft model provides excellent maneuverability for general yard work, while the straight shaft versions offer better reach under shrubs and fences. Regardless of which model you own, the principles of operation and maintenance remain largely the same.

Fuel Matters: The Lifeblood of Your Trimmer

As mentioned, your Bolens 2 cycle trimmer runs on a mixture of gasoline and oil. Using the correct fuel mixture is absolutely crucial for proper performance and longevity of your machine. Let me share what I’ve learned (sometimes the hard way) about fueling your trimmer.

What Type of Fuel Does a Bolens 2 Cycle Trimmer Use?

For optimal performance, your Bolens trimmer requires unleaded gasoline with a minimum octane rating of 87 (regular unleaded gas). I’ve found that using fuel with higher ethanol content (like E15 or E85) can cause running problems and potentially damage your engine over time. Whenever possible, I use ethanol-free gas, which I purchase at a local specialty station. It costs a bit more, but the improved performance and reduced maintenance issues make it worthwhile.

As for the oil component, you’ll need 2 cycle engine oil specifically formulated for air-cooled engines. Don’t substitute automotive oil, as it lacks the additives needed for proper lubrication in a 2 cycle engine. I use a high-quality synthetic 2 cycle oil, which burns cleaner and provides better protection.

How Do I Mix Fuel for a Bolens 2 Cycle Trimmer?

The proper fuel-to-oil ratio for most Bolens 2 cycle trimmers is 40:1, which translates to 3.2 ounces of oil per gallon of gasoline. Always check your owner’s manual to verify the correct ratio for your specific model, as requirements can vary.

Here’s my fuel-mixing routine:

1. I use a clean, dedicated gas can specifically for my 2 cycle equipment.
2. Add the appropriate amount of 2 cycle oil first.
3. Then add the gasoline.
4. Secure the cap and gently shake the container to ensure thorough mixing.

I mix smaller batches (usually 1-2 gallons) rather than large amounts since the fuel mixture can degrade over time. Ideally, use your fuel mixture within 30 days for best performance.

A personal tip: I keep a small notebook in my garage where I record when I mix fuel. This helps me keep track of how fresh my mixture is and prevents me from using stale fuel.

How Much Oil Should I Use for a Bolens 2 Cycle Trimmer?

As mentioned, the standard ratio is 40:1 (40 parts gasoline to 1 part oil). Here’s a quick reference chart I’ve found helpful:

• 1 gallon of gas = 3.2 ounces of oil
• 2 gallons of gas = 6.4 ounces of oil
• 5 gallons of gas = 16 ounces of oil

Many quality 2 cycle oils come with measuring containers or markings to help you get the ratio right. If you’re uncertain, it’s better to err slightly on the side of too much oil rather than too little. Too little oil can cause engine damage due to inadequate lubrication, while a slightly oil-rich mixture will just produce a bit more smoke.

Starting Your Bolens 2 Cycle Trimmer: A Step-by-Step Guide

One of the most common frustrations with any string trimmer is getting it started, especially after it’s been sitting unused for a while. Over the years, I’ve developed a reliable starting routine that works consistently for my Bolens trimmer.

What is the Best Way to Start a Bolens 2 Cycle Trimmer?

Follow these steps for a smooth start:

1. Place the trimmer on level ground.
2. Make sure your fuel tank has fresh, properly mixed fuel.
3. Press the primer bulb slowly 5-7 times or until you see fuel in the bulb. (Overpumping can flood the engine.)
4. Set the choke to the full choke position (usually labeled “Start” or “Choke”).
5. Hold the trimmer securely with one hand on the handle.
6. Pull the starter cord with a smooth, firm motion. Don’t jerk it or pull it to its maximum length.
7. Once the engine attempts to start (even briefly), move the choke to the half-choke position.
8. Pull the starter cord again until the engine starts and runs.
9. Allow the engine to warm up for 30-60 seconds at half-choke.
10. Move the choke to the run position (usually labeled “Run”).

I’ve found that patience is key when starting a 2 cycle engine. Yanking the cord repeatedly without adjusting the choke can easily flood the engine. If you smell excess fuel or the cord becomes very difficult to pull, the engine is likely flooded. In this case, move the choke to the “Run” position, squeeze the throttle, and pull the cord several times to clear excess fuel.

Why Won’t My Bolens 2 Cycle Trimmer Start?

If you’re following the proper starting procedure and still having trouble, here are some common issues I’ve encountered:

1. Stale Fuel: Fuel that’s been sitting for more than 30 days can deteriorate and cause starting problems. Drain old fuel and replace with fresh mixture.
2. Dirty Air Filter: A clogged air filter restricts airflow to the carburetor. Remove and clean or replace it.
3. Fouled Spark Plug: Remove the spark plug and check for carbon buildup or damage. Clean it with a wire brush or replace if necessary.
4. Clogged Fuel Filter: The fuel filter can become clogged over time. Replace if it appears dirty.
5. Carburetor Issues: If the carburetor is dirty or clogged, it may need cleaning or adjustment.
6. Flooded Engine: If you smell excess fuel, the engine might be flooded. Move the choke to “Run,” hold the throttle open, and pull the starter cord multiple times to clear it.

My personal nemesis has always been stale fuel. I once spent an entire Saturday morning trying to start my trimmer before realizing I was using the same gas mixture from the previous season. Now I always start each season with fresh fuel, and it makes a world of difference.

Maintenance Matters: Keeping Your Trimmer Running Smoothly

Regular maintenance is crucial for keeping your Bolens trimmer running at peak performance. Here’s what I’ve learned about essential maintenance tasks.

How Do You Replace the String on a Bolens 2 Cycle Trimmer?

Replacing the trimmer line is probably the most frequent maintenance task you’ll perform. Here’s my approach:

1. Turn off the trimmer and disconnect the spark plug for safety.
2. Press in the tabs on the sides of the string head cover and remove it.
3. Remove the spool from the housing.
4. Clean out any old line and debris from the spool and housing.
5. Cut a new piece of trimmer line to the length specified in your manual (usually 10-20 feet).
6. Find the anchor hole in the center partition of the spool.
7. Insert one end of the line into this hole and secure it.
8. Wind the line around the spool in the direction of the arrows (usually counterclockwise), keeping the line taut and even.
9. Leave about 6 inches of line unwound.
10. Snap the spool back into the housing, threading the line end(s) through the outlet hole(s).
11. Replace the cover, making sure it snaps securely into place.

I’ve found that winding the line too tightly or too loosely can cause feeding problems. Aim for neat, even layers without crossing the lines.

What is the Best String to Use for a Bolens 2 Cycle Trimmer?

The recommended line diameter for most Bolens trimmers is .080 inches, though some models can accommodate .095-inch line for tougher jobs. I prefer a high-quality round or twisted line for general use, as it cuts efficiently and feeds reliably.

For tougher weeds and brush, I sometimes use a serrated or square-shaped line, which provides more cutting power but may wear out faster. If you’re dealing primarily with light grass trimming, the standard round line works perfectly fine.

I’ve experimented with various brands, and while there are differences in durability and performance, I’ve found that proper winding and storage have a bigger impact on line performance than brand differences.

What is the Correct Spark Plug for a Bolens 2 Cycle Trimmer?

Most Bolens 2 cycle trimmers use a Champion RCJ6Y or equivalent spark plug. Always check your owner’s manual for the exact specification for your model. When replacing the spark plug, set the gap to 0.025 inches (0.635 mm) unless otherwise specified.

I replace my spark plug annually as part of my spring maintenance routine, even if it still looks good. At around $3-5 each, spark plugs are inexpensive insurance against poor performance.

How Do I Clean the Carburetor on a Bolens 2 Cycle Trimmer?

Carburetor cleaning is a bit more advanced but often necessary if your trimmer is running poorly. Here’s my approach:

1. Remove the air filter cover and air filter.
2. Locate the carburetor (typically behind the air filter).
3. Take photos before disassembly to help with reassembly.
4. Carefully remove the carburetor, keeping track of all parts and connections.
5. Spray carburetor cleaner through all ports and openings.
6. Use compressed air to blow out any debris (never use wire or drill bits to clean jets).
7. Inspect the gaskets and diaphragms for damage, replacing if necessary.
8. Reassemble the carburetor and reinstall it.

If you’re not comfortable with this level of disassembly, it might be worth taking your trimmer to a small engine repair shop. That said, I’ve found that simply spraying carburetor cleaner through the air intake with the filter removed can often improve performance without full disassembly.

How Do You Adjust the Idle on a Bolens 2 Cycle Trimmer?

Adjusting the idle can help if your trimmer is stalling or if the cutting head spins at idle. Most Bolens trimmers have an idle adjustment screw marked “T” or “LA” on the carburetor. Here’s how I adjust mine:

1. Start the trimmer and let it warm up for 2-3 minutes.
2. If the cutting head spins at idle, turn the idle screw counterclockwise slowly until it stops.
3. If the engine stalls at idle, turn the screw clockwise slightly until the engine runs smoothly without spinning the cutting head.
4. Make small adjustments (1/8 turn at a time), testing after each adjustment.

I’ve found that most idle problems occur due to dirty carburetors or air filters rather than incorrect adjustment. Always clean these components before making carburetor adjustments.

Troubleshooting Common Issues

Even with proper maintenance, you may occasionally encounter performance issues. Here are some common problems I’ve faced and how I’ve resolved them.

How Do You Troubleshoot a Bolens 2 Cycle Trimmer that Stalls?

A trimmer that starts but then stalls can be incredibly frustrating. Here’s how I approach this problem:

1. Check the Fuel Mix: Ensure you’re using fresh fuel with the correct oil-to-gas ratio.
2. Examine the Air Filter: A dirty air filter restricts airflow, causing the engine to stall. Clean or replace it.
3. Check the Spark Arrestor: This small screen prevents sparks from exiting the exhaust. It can become clogged with carbon deposits. Remove and clean it with a wire brush.
4. Inspect the Fuel Filter: A clogged fuel filter can restrict fuel flow. Replace if necessary.
5. Check for Clogged Exhaust Ports: Carbon buildup in the exhaust ports can cause stalling. This requires removing the muffler and cleaning the ports.
6. Examine the Carburetor: If the carburetor is dirty or its diaphragms are stiff, it may need cleaning or rebuilding.

I once had a trimmer that would run for about 10 seconds and then die. After checking everything else, I finally discovered that the gas cap vent was clogged, creating a vacuum in the tank that prevented fuel flow. A quick cleaning of the vent hole solved the problem.

How Do You Fix a Bolens 2 Cycle Trimmer with Poor Performance?

If your trimmer runs but lacks power or bogs down under load, try these solutions:

1. Check the Spark Plug: A fouled or improperly gapped spark plug can cause power loss.
2. Clean the Air Filter: A dirty air filter restricts airflow and reduces power.
3. Check the Exhaust System: A clogged spark arrestor or muffler can cause power loss.
4. Examine the Fuel Filter: A partially clogged fuel filter can restrict fuel flow.
5. Check for Fuel Line Restrictions: Pinched or deteriorated fuel lines can limit fuel flow.
6. Inspect the Cylinder and Piston: Excessive carbon buildup or scoring on the cylinder walls or piston can reduce compression and power.
7. Check the Trimmer Head: A trimmer head that’s bound up with debris or has too much line extended can bog down the engine.

I’ve found that poor performance often results from multiple minor issues rather than one major problem. Addressing all maintenance aspects—fuel, air, spark, and mechanical components—usually resolves performance problems.

Assembly and Operation Tips

Whether you’re putting together a new trimmer or reassembling after maintenance, proper assembly ensures safe and effective operation.

How Do You Assemble a Bolens 2 Cycle Trimmer?

While specific assembly instructions vary by model, here’s the general process I follow:

1. Attach the shaft to the engine housing, ensuring it locks securely.
2. Connect the throttle cable and any electrical connections.
3. Install the handle or auxiliary handle according to the manual.
4. Attach the guard shield securely.
5. Install the trimmer head or cutting attachment.
6. Check all bolts and connections for tightness.

I always follow the owner’s manual during assembly, as improper assembly can lead to safety hazards or poor performance.

Can a Bolens 2 Cycle Trimmer Be Used for Edging?

Yes, most Bolens trimmers can be used for edging along sidewalks and driveways. Here’s how I edge with mine:

1. Flip the trimmer so that the cutting head is vertical, with the guard shield toward you.
2. Position the trimmer so the string rotates in a direction that throws debris away from you.
3. Move slowly along the edge, maintaining a consistent depth.

Some Bolens models feature a rotating head or shaft that makes edging even easier. While dedicated edgers may provide cleaner results, I find that my trimmer does a perfectly acceptable job for my needs.

Storage and Seasonal Care

Proper storage, especially during the off-season, helps ensure your trimmer starts easily when spring arrives.

How Do I Store My Bolens 2 Cycle Trimmer for the Winter?

Here’s my end-of-season storage routine:

1. Run the engine until it’s out of fuel, or drain the fuel tank.
2. Remove the spark plug and add a small amount (about 1 teaspoon) of 2 cycle oil into the cylinder.
3. Pull the starter cord slowly a few times to distribute the oil.
4. Replace the spark plug without tightening it fully.
5. Clean the exterior of the trimmer, removing all grass and debris.
6. Check for loose parts and tighten as needed.
7. Store the trimmer in a clean, dry place away from direct sunlight.

I learned the importance of proper storage the hard way after leaving fuel in my trimmer one winter. The resulting gummy deposits required a complete carburetor cleaning come spring. Now I’m religious about my winterization routine.

Safety Precautions: Protecting Yourself and Your Trimmer

Safety should always be your top priority when operating any power equipment. Here are the safety practices I’ve adopted over the years.

What Safety Precautions Should I Take When Using a Bolens 2 Cycle Trimmer?

1. Wear Proper Protection: Always wear safety glasses or goggles, hearing protection, long pants, closed-toe shoes, and gloves.
2. Inspect Before Use: Check for loose parts, fuel leaks, or damage before starting.
3. Clear the Area: Remove rocks, sticks, toys, and other objects that could become projectiles.
4. Maintain Awareness: Be aware of your surroundings, including people, pets, and obstacles.
5. Use Both Hands: Always operate the trimmer with both hands on the designated handles.
6. Maintain Balance: Keep proper footing and balance, especially on slopes.
7. Avoid Overreaching: Don’t extend your arms too far while trimming, as this can cause you to lose balance.
8. Take Breaks: Fatigue can lead to accidents, so take regular breaks during extended use.
9. Shut Off When Not Cutting: Always turn off the engine when moving between work areas.
10. Never Remove Guards: The debris shield is there for your protection.

I once had a small stone hit my shin while trimming without wearing long pants—a painful lesson that proper protective gear is non-negotiable.

Where to Find Help and Parts

Even with the best maintenance, parts eventually wear out and need replacement.

Where Can I Buy Replacement Parts for a Bolens 2 Cycle Trimmer?

I’ve found replacement parts through several channels:

1. Authorized Dealers: Local dealers often stock common replacement parts.
2. Home Improvement Stores: Stores like Home Depot, Lowe’s, and Menards carry some Bolens parts.
3. Online Retailers: Websites like Amazon, eBay, and specialized small engine parts retailers offer a wide selection.
4. Manufacturer’s Website: MTD Products, which owns the Bolens brand, offers parts through their website.

When purchasing parts, I always try to use OEM (Original Equipment Manufacturer) parts when possible, especially for critical components like the carburetor. For items like air filters and spark plugs, I’ve had good success with quality aftermarket parts.

What is the Warranty on a Bolens 2 Cycle Trimmer?

Most Bolens trimmers come with a 2-year limited warranty for residential use. Commercial use typically carries a shorter warranty period. The warranty generally covers defects in materials and workmanship but not wear items like the trimmer line, spark plug, or air filter.

To maintain warranty coverage, it’s important to:

• Use the correct fuel mixture
• Follow maintenance guidelines
• Keep your receipt as proof of purchase
• Use the trimmer only as intended

I keep a folder with all my outdoor equipment receipts and warranty information for easy reference if issues arise.

Are Bolens 2 Cycle Trimmers Good for Heavy-Duty Trimming?

In my experience, Bolens trimmers are well-suited for typical residential use, including regular grass trimming and light to moderate weed control. For occasional heavy-duty work, they can handle the job, though they may not be ideal for constant commercial use or extremely dense vegetation.

I’ve successfully used my Bolens to clear a fairly overgrown area when we first moved into our current home. While it required patience and several passes, the trimmer held up well. For regular maintenance of established areas, it performs excellently.

If you frequently need to cut through thick brush or saplings, you might consider a trimmer with a higher displacement engine or a brush cutter attachment. However, for most homeowners, a standard Bolens trimmer provides sufficient power for typical yard maintenance tasks.

Conclusion: Getting the Most from Your Bolens 2 Cycle Trimmer

After years of using my Bolens trimmer, I’ve come to appreciate its reliability and effectiveness when properly maintained. The key lessons I’ve learned can be summarized as:

1. Use the right fuel mix: Always use fresh, properly mixed fuel with the correct oil-to-gas ratio.
2. Maintain regularly: Clean the air filter, check the spark plug, and inspect the trimmer before each use.
3. Store properly: Take the time to properly prepare your trimmer for storage, especially for long periods.
4. Address problems promptly: Don’t ignore small issues, as they often become bigger problems if left unattended.
5. Prioritize safety: Always wear appropriate protective gear and follow safe operating practices.

Your Bolens 2 cycle trimmer can provide years of reliable service with proper care and maintenance. I hope my experiences help you get the most from your trimmer while avoiding some of the frustrations I’ve encountered along the way.

Remember, the most important thing to remember about a 2 cycle trimmer is that it requires a specific mixture of gas and oil to function properly. Get that right, and you’re well on your way to a well-maintained yard and a long-lasting trimmer.

Happy trimming!