Briggs and Stratton 950 Snow Series Carburetor (5 Fixes)
Hello there! If you’re searching for “Briggs and Stratton 950 Snow Series Carburetor (5 Fixes),” chances are your snow blower isn’t performing as it should. A malfunctioning carburetor on your snow blower can be a real headache, especially when you’re battling a blizzard. But before you rush out to buy a new machine or pay a hefty repair bill, let’s explore some common carburetor issues and how you can fix them yourself. This can save you a significant amount of money in the long run. I’ve spent years working with small engines, particularly those powering equipment used in wood processing and firewood preparation, and the principles are very similar. A clean, well-functioning carburetor is essential for reliable performance.
Understanding the Briggs & Stratton 950 Snow Series Carburetor
The Briggs & Stratton 950 Snow Series engine is a popular choice for snow blowers due to its reliability and power. However, like any small engine, the carburetor can become problematic over time. Before we dive into the fixes, let’s understand what the carburetor does and why it’s so important.
What is a Carburetor?
The carburetor’s primary function is to mix air and fuel in the correct proportion to create a combustible mixture that the engine can burn. This mixture is then drawn into the engine’s cylinder, where it’s ignited by the spark plug, powering the machine. In the context of snow blowers, a properly functioning carburetor ensures the engine starts easily, runs smoothly, and delivers the necessary power to clear snow effectively.
Why Carburetors Fail
Carburetors are susceptible to various issues, primarily due to the small passages and jets within them. These passages can easily become clogged with debris, varnish from old fuel, or even moisture. Common causes of carburetor failure include:
- Old Fuel: Fuel left in the carburetor for extended periods can evaporate, leaving behind a sticky residue that clogs the jets.
- Dirt and Debris: Small particles of dirt, rust, or other debris can enter the fuel system and clog the carburetor.
- Water Contamination: Water in the fuel tank can lead to corrosion and blockages in the carburetor.
- Incorrect Fuel/Oil Mixture: While less common in four-stroke snow blower engines, using the wrong fuel or an improper fuel/oil mixture (if applicable) can cause carburetor issues.
- Wear and Tear: Over time, the carburetor’s internal components can wear out, leading to leaks or improper fuel delivery.
5 Common Briggs & Stratton 950 Snow Series Carburetor Fixes
Now, let’s move on to the five most common fixes for a malfunctioning Briggs & Stratton 950 Snow Series carburetor. I’ll guide you through each step with clear instructions and helpful tips.
Fix 1: Cleaning the Carburetor
The most frequent issue with carburetors is clogging. Cleaning the carburetor is often the first and most effective step in restoring its functionality.
Tools and Materials Needed:
- Socket set or wrench set
- Screwdrivers (Phillips and flathead)
- Carburetor cleaner spray
- Small brushes (old toothbrush, pipe cleaners)
- Compressed air (optional)
- Safety glasses
- Gloves
- Clean rags or paper towels
Step-by-Step Cleaning Guide:
- Safety First: Disconnect the spark plug wire to prevent accidental starting. This is crucial for your safety.
- Remove the Air Filter Assembly: Locate and remove the air filter cover, followed by the air filter itself. Note how the components are arranged for easy reassembly.
- Disconnect Fuel Lines: Carefully disconnect the fuel lines from the carburetor. Have a small container ready to catch any spilled fuel. Use fuel line clamps if necessary to prevent fuel from draining out of the tank.
- Detach the Carburetor: Loosen and remove the bolts or screws that secure the carburetor to the engine. Be gentle and avoid forcing anything.
- Disassemble the Carburetor:
- Float Bowl: Remove the float bowl from the bottom of the carburetor. This is usually held in place by a single bolt or screw. Be prepared for some fuel to spill out.
- Float and Needle Valve: Carefully remove the float and the needle valve. The needle valve controls the fuel flow into the float bowl.
- Jets: Locate the main jet and pilot jet. These are small brass screws with tiny holes. Use a small screwdriver to remove them.
- Clean the Components:
- Spray: Thoroughly spray all carburetor components with carburetor cleaner. Pay special attention to the jets and the passages in the carburetor body.
- Brush: Use small brushes to scrub away any stubborn deposits. Pipe cleaners are excellent for cleaning the tiny passages in the jets.
- Compressed Air: If you have compressed air, use it to blow out the passages and jets. This helps remove any remaining debris.
- Reassemble the Carburetor:
- Jets: Reinstall the main jet and pilot jet, ensuring they are snug but not overtightened.
- Needle Valve and Float: Reinstall the needle valve and float. Ensure the float moves freely.
- Float Bowl: Reattach the float bowl, tightening the bolt or screw securely.
- Reattach the Carburetor to the Engine: Carefully reattach the carburetor to the engine, securing it with the bolts or screws.
- Reconnect Fuel Lines: Reconnect the fuel lines to the carburetor, ensuring they are securely attached.
- Reinstall Air Filter Assembly: Reinstall the air filter and air filter cover.
- Reconnect Spark Plug Wire: Reconnect the spark plug wire.
- Test the Engine: Start the engine and observe its performance. It should start easily and run smoothly.
Personal Story: I once had a snow blower that wouldn’t start after sitting idle for the summer. After cleaning the carburetor using the steps above, it fired right up. The satisfaction of fixing it myself and saving money on a repair bill was immense.
Insight: When cleaning the carburetor, pay close attention to the tiny holes in the jets. These are very small and easily clogged. Use a magnifying glass if necessary to ensure they are completely clear.
Fix 2: Replacing the Carburetor
If cleaning the carburetor doesn’t solve the problem, or if the carburetor is severely damaged, replacing it might be necessary.
Tools and Materials Needed:
- New carburetor (compatible with Briggs & Stratton 950 Snow Series)
- Socket set or wrench set
- Screwdrivers (Phillips and flathead)
- Fuel line clamps (optional)
- Safety glasses
- Gloves
- Clean rags or paper towels
Step-by-Step Replacement Guide:
- Safety First: Disconnect the spark plug wire.
- Remove the Air Filter Assembly: Remove the air filter cover and air filter.
- Disconnect Fuel Lines: Disconnect the fuel lines from the old carburetor. Have a container ready to catch any spilled fuel.
- Detach the Old Carburetor: Loosen and remove the bolts or screws that secure the old carburetor to the engine.
- Install the New Carburetor:
- Carefully position the new carburetor onto the engine.
- Secure it with the bolts or screws, tightening them evenly.
- Reconnect Fuel Lines: Reconnect the fuel lines to the new carburetor, ensuring they are securely attached.
- Reinstall Air Filter Assembly: Reinstall the air filter and air filter cover.
- Reconnect Spark Plug Wire: Reconnect the spark plug wire.
- Test the Engine: Start the engine and observe its performance. The engine should start easily and run smoothly.
Insight: When purchasing a new carburetor, make sure it’s compatible with your specific engine model. Check the part number and compare it to the original carburetor.
Fix 3: Adjusting the Carburetor
Sometimes, the carburetor might be clean but not properly adjusted. This can lead to poor performance, such as rough idling or stalling.
Tools and Materials Needed:
- Small screwdriver
- Tachometer (optional)
- Safety glasses
- Gloves
Step-by-Step Adjustment Guide:
- Locate Adjustment Screws: Identify the idle adjustment screw and the main jet adjustment screw (if applicable). These are usually small screws located on the carburetor body.
- Start the Engine: Start the engine and let it warm up for a few minutes.
- Adjust Idle Speed:
- Turn the idle adjustment screw clockwise to increase the idle speed, or counterclockwise to decrease it.
- Adjust the idle speed until the engine runs smoothly without stalling.
- Refer to your snow blower’s manual for the recommended idle speed (usually around 1750-2000 RPM).
- Adjust Main Jet (If Applicable):
- Slowly turn the main jet adjustment screw clockwise until the engine starts to run rough or stall.
- Then, slowly turn the screw counterclockwise until the engine runs smoothly.
- Find the point where the engine runs the smoothest and has the best throttle response.
- Fine-Tune: Make small adjustments to both the idle and main jet screws until the engine runs optimally.
- Test Under Load: If possible, test the engine under load (e.g., by engaging the snow blower auger) to ensure it performs well.
Insight: Carburetor adjustment can be a bit of a trial-and-error process. Make small adjustments and observe the engine’s response. Keep a record of the adjustments you make so you can return to the original settings if needed.
Fix 4: Checking and Replacing Fuel Lines
Cracked or damaged fuel lines can cause air leaks, leading to poor engine performance. Inspecting and replacing fuel lines is a relatively simple task.
Tools and Materials Needed:
- New fuel lines (compatible with your snow blower)
- Fuel line clamps
- Pliers
- Safety glasses
- Gloves
- Clean rags or paper towels
Step-by-Step Fuel Line Replacement Guide:
- Safety First: Disconnect the spark plug wire.
- Inspect Fuel Lines: Carefully inspect all fuel lines for cracks, leaks, or damage. Pay attention to the areas near the connections.
- Disconnect Old Fuel Lines: Use pliers to loosen the fuel line clamps and disconnect the old fuel lines from the carburetor and fuel tank.
- Install New Fuel Lines:
- Measure and cut the new fuel lines to the correct length.
- Attach the new fuel lines to the carburetor and fuel tank.
- Secure the fuel lines with new fuel line clamps.
- Check for Leaks: After installing the new fuel lines, check for any leaks. If you find any leaks, tighten the clamps or replace the fuel lines.
- Reconnect Spark Plug Wire: Reconnect the spark plug wire.
- Test the Engine: Start the engine and observe its performance. The engine should start easily and run smoothly.
Insight: When replacing fuel lines, use fuel lines specifically designed for small engines. These lines are resistant to fuel and oil and will last longer than generic tubing.
Fix 5: Addressing Air Leaks
Air leaks can disrupt the air-fuel mixture, causing the engine to run poorly. Common areas for air leaks include the carburetor gasket, intake manifold, and cylinder head.
Tools and Materials Needed:
- New carburetor gasket
- Socket set or wrench set
- Screwdrivers (Phillips and flathead)
- Spray bottle with soapy water
- Safety glasses
- Gloves
- Clean rags or paper towels
Step-by-Step Air Leak Detection and Repair Guide:
- Safety First: Disconnect the spark plug wire.
- Inspect for Obvious Leaks: Visually inspect the carburetor gasket and intake manifold for any cracks or damage.
- Spray with Soapy Water:
- Mix a solution of soapy water in a spray bottle.
- Start the engine.
- Spray the soapy water around the carburetor gasket, intake manifold, and cylinder head.
- Watch for bubbles, which indicate an air leak.
- Replace Carburetor Gasket:
- If you suspect a leak in the carburetor gasket, remove the carburetor.
- Replace the old gasket with a new one.
- Reattach the carburetor, ensuring it is securely tightened.
- Tighten Intake Manifold Bolts: Check the intake manifold bolts and tighten them if they are loose.
- Address Cylinder Head Leaks (If Necessary): If you suspect a leak in the cylinder head, consult a qualified mechanic. This repair can be more complex.
- Reconnect Spark Plug Wire: Reconnect the spark plug wire.
- Test the Engine: Start the engine and observe its performance. The engine should run smoothly without any signs of air leaks.
Insight: When replacing the carburetor gasket, make sure to use the correct gasket for your engine model. An incorrect gasket can cause leaks and poor performance.
Preventative Maintenance Tips
Preventing carburetor problems is always better than fixing them. Here are some preventative maintenance tips to keep your Briggs & Stratton 950 Snow Series carburetor in good condition:
- Use Fresh Fuel: Always use fresh, high-quality fuel. Avoid using fuel that has been sitting for more than a month.
- Add Fuel Stabilizer: If you’re storing your snow blower for an extended period, add fuel stabilizer to the fuel tank. This will prevent the fuel from breaking down and clogging the carburetor.
- Drain the Fuel Tank: Before storing your snow blower, drain the fuel tank and run the engine until it stalls. This will remove any fuel from the carburetor and prevent it from clogging.
- Clean the Air Filter Regularly: A clean air filter ensures that only clean air enters the engine, preventing dirt and debris from clogging the carburetor.
- Inspect Fuel Lines Regularly: Inspect the fuel lines regularly for cracks, leaks, or damage. Replace them as needed.
Wood Processing & Firewood Preparation: The Carburetor Connection
Now, you might be wondering, what does all this have to do with wood processing and firewood preparation? Well, many of the tools we use in these activities, such as chainsaws, log splitters, and wood chippers, are powered by small engines with carburetors.
Chainsaws
Chainsaws are essential for felling trees, limbing branches, and cutting firewood. A chainsaw with a well-functioning carburetor starts easily, runs smoothly, and delivers the power needed to cut through wood efficiently.
Example: I once had a chainsaw with a clogged carburetor that made felling a large oak tree incredibly difficult. After cleaning the carburetor, the chainsaw ran like new, making the job much easier and safer.
Log Splitters
Log splitters are used to split firewood into manageable pieces. Many log splitters are powered by gasoline engines with carburetors. A properly functioning carburetor ensures the engine delivers the power needed to split logs efficiently.
Example: I use a hydraulic log splitter powered by a Briggs & Stratton engine to split firewood for my wood-burning stove. Regular carburetor maintenance ensures the splitter runs reliably and efficiently.
Wood Chippers
Wood chippers are used to turn branches and small logs into wood chips, which can be used for landscaping or composting. A wood chipper with a well-maintained carburetor can handle large volumes of wood without bogging down.
Example: I use a wood chipper to process the branches and small logs left over from felling trees. A clean carburetor ensures the chipper runs smoothly and efficiently, reducing the amount of time and effort required.
Case Study: Reviving a Neglected Wood Chipper
I once acquired a used wood chipper that had been neglected for several years. The engine wouldn’t start, and the carburetor was clearly clogged. Here’s how I revived it:
- Initial Assessment: I started by inspecting the engine and fuel system. The fuel tank was full of old, stale fuel, and the carburetor was covered in dirt and grime.
- Fuel System Cleaning: I drained the old fuel from the tank and replaced it with fresh fuel. I also added fuel stabilizer to prevent future problems.
- Carburetor Cleaning: I removed the carburetor and thoroughly cleaned it using carburetor cleaner and small brushes. I paid special attention to the jets and passages.
- Fuel Line Replacement: The fuel lines were cracked and brittle, so I replaced them with new fuel lines.
- Spark Plug Replacement: The spark plug was fouled, so I replaced it with a new one.
- Engine Start: After reassembling the engine, I tried to start it. It took a few tries, but eventually, the engine roared to life.
- Performance Testing: I tested the wood chipper by feeding it branches and small logs. It performed flawlessly, chipping the wood quickly and efficiently.
Lessons Learned: This experience taught me the importance of regular maintenance and the value of being able to diagnose and repair small engine problems. It also highlighted the connection between carburetor maintenance and the overall performance of wood processing equipment.
Strategic Advantages of DIY Carburetor Repair
Beyond the immediate cost savings, repairing your own carburetor offers several strategic advantages:
- Increased Self-Reliance: You gain the ability to diagnose and fix common engine problems, reducing your dependence on repair shops.
- Improved Equipment Lifespan: Regular maintenance and timely repairs can extend the lifespan of your equipment, saving you money in the long run.
- Enhanced Safety: A well-maintained engine is less likely to malfunction, reducing the risk of accidents.
- Greater Understanding: You develop a deeper understanding of how your equipment works, allowing you to operate it more effectively and safely.
Next Steps
Now that you have a better understanding of Briggs & Stratton 950 Snow Series carburetor problems and how to fix them, here are some next steps you can take:
- Gather Your Tools and Materials: Assemble the tools and materials you’ll need for carburetor cleaning, replacement, or adjustment.
- Consult Your Snow Blower’s Manual: Refer to your snow blower’s manual for specific instructions and recommendations.
- Watch Online Tutorials: Watch online tutorials to see the repair process in action.
- Start with the Simplest Fix: Begin with the simplest fix (cleaning the carburetor) and progress to more complex repairs if necessary.
- Seek Professional Help: If you’re uncomfortable performing any of these repairs, seek help from a qualified mechanic.
Conclusion
A malfunctioning carburetor can be a frustrating problem, but with a little knowledge and effort, you can often fix it yourself. By following the steps outlined in this guide, you can save money, increase your self-reliance, and keep your Briggs & Stratton 950 Snow Series engine running smoothly for years to come. Remember, preventative maintenance is key to avoiding carburetor problems in the first place. So, take good care of your equipment, and it will take good care of you.
