Best Air Cleaner Alternatives for 1970 Honda CL175

If you own a 1970 Honda CL175, you understand how important it is to keep the engine in top condition. The air cleaner is a crucial component that ensures clean airflow to the engine, protecting it from harmful dust and debris. If you’re looking for an alternative air cleaner or an upgrade, this guide covers everything you need to make an informed decision, including clear, actionable steps, expert tips, and helpful visuals.

Understanding the Stock Air Cleaner for the 1970 Honda CL175

Before exploring alternatives, it’s important to understand the original air cleaner setup. The 1970 Honda CL175 comes with a paper element filter housed in a metal canister. This design offers reliable filtration but can become harder to find as the bike ages.

Why You Might Want to Change It:

• Aging components: The original canisters and filters may be damaged or no longer available.
• Performance enhancement: Upgrading to a high-flow filter can improve engine efficiency and responsiveness.
• Space-saving: Some riders prefer smaller, more compact filters like pod filters to reduce bulk.

Best Air Cleaner Alternatives for the Honda CL175

Here’s a rundown of the top alternatives, including their pros and cons. Whether you’re looking for a budget option, better performance, or a complete overhaul, these choices will guide you.

A. Pod Air Filters: A Quick and Affordable Option

Pod filters are cylindrical air filters that fit directly onto the carburetor intake. They’re a popular option for riders looking to reduce space and improve airflow.

Pros:

• Simple installation: Most pod filters can be installed quickly with basic tools.
• Space-saving: Ideal for riders looking to simplify their bike’s appearance.
• Affordable: A cost-effective alternative to expensive OEM or K&N filters.

Cons:

• Carburetor rejetting needed: To achieve optimal performance, you’ll likely need to adjust your carburetor’s jetting to match the increased airflow.
• Reduced filtration: Compared to the original system, pod filters might not trap as many particles, potentially leading to engine wear over time.

Installation Steps:

1. Choose a pod filter that matches your carburetor intake size (measure the diameter).
2. Use a hose clamp to secure the filter firmly to the carb.
3. Rejet the carburetor if necessary to accommodate the increased airflow (see step-by-step guide below).

Tip: If you’re new to mechanical work, consult a mechanic for carburetor adjustments after installing the filter.

B. Replacement Paper Filters: The OEM Alternative

For those who prefer keeping the bike as close to stock as possible, replacement paper filters are the most straightforward option. These filters match the original design and provide excellent filtration.

Pros:

• Exact fitment: Designed specifically for the CL175 air cleaner housing.
• Superior filtration: Offers better protection than pod filters by trapping more dirt and debris.
• Maintains stock performance: If you’re a purist, this is the best choice for maintaining original specs.

Cons:

• Hard to find: Genuine replacement filters can be rare and sometimes expensive.
• Requires regular replacement: Paper filters need to be replaced every 2,000–3,000 miles.

Installation Steps:

1. Confirm the part number of the replacement filter to ensure compatibility.
2. Remove the air cleaner housing and insert the new filter into the canister.
3. Check for any cracks or damage in the housing, which could reduce filtration efficiency.

Tip: Keep a spare filter in your toolkit for easy replacements during long trips.

C. K&N Universal Air Filters: Performance Upgrade

For those looking to boost performance, K&N filters are a great option. These washable, reusable filters are designed to provide superior airflow, resulting in more horsepower and better throttle response.

Pros:

• Higher airflow: Ideal for improving engine efficiency and performance.
• Long-lasting: Washable and reusable, saving money on replacements.
• Durable: Built to last, even under harsh riding conditions.

Cons:

• More expensive: K&N filters come at a higher initial cost.
• Carburetor rejetting: As with pod filters, you’ll need to adjust your carburetor’s jetting for optimal performance.

Installation Steps:

1. Measure your carburetor intake size to find a compatible K&N filter.
2. Install the filter using an adapter (if necessary) to securely attach it to the intake.
3. Rejet the carburetor to accommodate the increased airflow. (See “Rejetting the Carburetor” section below.)

Tip: Use the K&N cleaning kit to maintain the filter and extend its lifespan.

D. Custom Air Cleaner Assemblies: Tailored to Your Needs

If you’re looking for the ultimate performance upgrade and have the tools and skills to back it up, a custom air cleaner assembly is the way to go. This involves creating a custom intake system that could include pod filters, custom pipes, and brackets.

Pros:

• Complete customization: Tailor the system to your specific needs, including maximum airflow and style.
• Better performance: A well-designed custom air intake can outperform stock and even K&N filters.

Cons:

• Requires technical expertise: This option involves more time, tools, and knowledge.
• Potential for improper tuning: If not set up correctly, it could lead to poor engine performance.

Installation Steps:

1. Design the intake system: Choose the right components (custom pipes, filters, brackets).
2. Install the parts and make sure everything is sealed properly to prevent air leaks.
3. Tune the carburetor jets to match the new airflow demands.

Tip: Take your bike to a professional for a dyno tune after completing a custom air cleaner setup to get the most out of your modifications.

Choosing the Right Air Cleaner: A Quick Decision Guide

When selecting an air cleaner, consider the following:

• Performance vs. Stock: Do you want better airflow for more power (pod/K&N) or are you looking to maintain the bike’s original performance (replacement paper filter)?
• Budget: Pod filters are the most affordable, while K&N filters and custom assemblies require more investment.
• Maintenance: Reusable filters like K&N require regular cleaning, while paper filters need to be replaced periodically.
• Ease of Installation: Pod filters and paper filters are the easiest to install, while custom assemblies are best suited for advanced riders.

Advanced Tips for Carburetor Tuning and Airflow Optimization

For advanced riders, adjusting your carburetor after changing the air cleaner is key to getting the best performance. Here’s how you can fine-tune your carburetor:

Carburetor Rejetting: A Beginner’s Guide

1. Remove the carburetor from your bike and locate the jetting screws.
2. Replace the main jets and pilot jets with larger sizes to accommodate the extra airflow from pod filters or K&N filters.
3. Reassemble the carburetor and reinstall it.
4. Test ride your bike and check for any sputtering or stalling, indicating the need for further adjustments.

Tip: If you’re not confident with carburetor adjustments, consider asking a professional mechanic to help you with rejetting.

FAQ: Addressing Common Concerns

Q: What should I do if my CL175 starts stalling after installing a new air filter?

• Stalling could be a sign that your carburetor needs to be rejetted. Try adjusting the fuel mixture or seek professional help to ensure the carburetor is tuned for the new air filter.

Q: How can I tell if my air cleaner is too dirty or damaged?

• If you notice a drop in performance (poor throttle response, reduced power), it may be time to replace or clean your filter. For paper filters, check for visible dirt buildup; for pod filters, inspect the foam for damage.

Q: Are aftermarket air filters legal, or do they affect emissions?

• Aftermarket filters like K&N are generally legal for most non-emissions-controlled areas. However, if you live in an area with strict emissions laws, verify with local regulations.

Conclusion: Making the Right Choice

Choosing the right air cleaner depends on your priorities: performance, budget, or ease of installation. Here’s a quick breakdown:

• Pod Filters: Best for budget-conscious riders who want quick installation.
• Replacement Paper Filters: Ideal for stock lovers who prefer efficient filtration.
• K&N Filters: Great for performance enthusiasts looking for increased airflow and durability.
• Custom Assemblies: Perfect for advanced riders who want to completely tailor their setup.

Call-to-Action: Have you tried any of these air cleaner alternatives on your CL175? Share your experiences or ask questions in the comments below!