500i/661 Air Cleaner System
500i/661 Air Cleaner System
500i/661 Air Cleaner System
500i/661 Air Cleaner System
500i/661 Air Cleaner System
500i/661 Air Cleaner System
500i/661 Air Cleaner System
500i/661 Air Cleaner System
500i/661 Air Cleaner System
500i/661 Air Cleaner System

500i/661 Air Cleaner System

Part Number:

400-0611

Regular price$88.90
/

Introducing a new concept in air cleaner design. This innovative system includes an exterior cage, high-density foam, and a polyurethane bushing, which captures dirt and foreign particulates more efficiently than paper or gauze.  Whether you're a professional or a heavy-duty chainsaw user, this product provides the filtration quality you can rely on.

FEATURES:

  • Increased surface area, including breathability from the back side of the filter.

  • Polyurethane bushing prevents particulates from entering through the stud.

  • Crafted to fit perfectly under your chainsaw's factory hood, offering a simple modification for improved engine protection.
  • Includes one external cage and bushing, plus two washable foam filters.

  • Comes with an instructional card that includes how-to videos.

FITS: 

  • Stihl 500i

  • Stihl 661

IMPORTANT NOTES:

  • This filter requires oiling with a foam filter oil (Do NOT use spray oil). To complement this, we offer BelRay or UniFilter Oil and Cleaner separately, ensuring your air filter remains in optimal condition.

  • Your kit includes detailed installation directions - please read these thoroughly for proper setup and maintenance.

INSTALLATION TIP: 

When using our bushing, make sure that the flat portion is toward the motor and that it's snapped all the way down on the stud. Initially, when you first put it on, it will be stiff, and you may need to use a screwdriver and push down your 1/4-turn lock for the first time. After running for a while, it will loosen up. 

Ensure your chainsaw is always up for the task. Shop our large inventory of air filter stacks, foam filter oil, and foam filter cleaner

Q. Is this air filter washable?

A. Yes, this 500i/661 filter is washable. Before reapplying foam filter oil, you can clean it with UniFilter Foam Filter Cleaner, Simple Green, Purple Power, or Super Clean Degreaser. Frequent cleaning guarantees that the filter will continue to efficiently collect debris and particles, preserving the best possible chainsaw performance.

Q. How often should I change the air filter on my Stihl chainsaw?

A. Use and operating circumstances determine how often you should replace the air filter in your chainsaw. It is advised to inspect the inside of the filter to ensure no dirt is making its way through. Another good practice is to pinch the outside of the foam filter. If you can detect a dense buildup, it may be time to wash and re-oil the filter. 

 Stihl® is a registered trademark of Stihl® Incorporated and is used only to describe their products.  

Customer Reviews

Based on 45 reviews
93%
(42)
4%
(2)
2%
(1)
0%
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T
Teague Hoffman
Wow. Just wow

I put this on and immediately my saw shot chips harder, cut faster and just sounds overall better. Getting them for all my 500’s and told all the other arborists I know about it. Insane.

J
Jon Rolfe
Great air filter !

Great product !!! Great service !!

S
Steve Pye
661 oil foam filter

Great filter. Bar none considerably better than the factory paper filter both in performance and longevity.

B
Brett Howard
Great Product!

Awesome air filter!

E
Emile Lucht
Air Filter 500i

The filter is about for a week in use we are felling spruce firs. Appears to be a real improvement to the original filer 👍😍