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Description
291337001 Ignition Coil with Spark Plug - Fits Ryobi RY254BC, RY251PH, RY252CS, RY253SS291337001 Ignition Coil & Spark Plug Kit Key Features High Energy Spark Output: Precision wound internal coils generate a consistent, high voltage pulse to ensure reliable ignition even in cold starts or high load brush cutting conditions. Optimized Ignition Mapping: Specifically calibrated for Ryobi 25. 4cc 2 cycle engines to provide efficient combustion, leading to smoother idling and improved throttle response. Weather Shielded Encapsulation: The
291337001 Ignition Coil & Spark Plug Kit
Key Features
- High-Energy Spark Output: Precision-wound internal coils generate a consistent, high-voltage pulse to ensure reliable ignition even in cold starts or high-load brush cutting conditions.
- Optimized Ignition Mapping: Specifically calibrated for Ryobi 25.4cc 2-cycle engines to provide efficient combustion, leading to smoother idling and improved throttle response.
- Weather-Shielded Encapsulation: The internal circuitry is fully potted in high-grade, heat-resistant epoxy to protect against vibration, moisture, and debris common in outdoor landscaping.
- Reinforced High-Tension Lead: Equipped with a durable silicone spark plug boot and a heavy-duty wire designed to resist electrical "arching" and thermal degradation.
- Complete Ignition Refresh: This kit includes both the electronic ignition module and a matched spark plug, providing a total solution for restoring a weak or non-existent spark.
Replaces / Cross-Reference Part Numbers
- 291337001
- 291337008
Compatibility & Fitment
This ignition module is a standard replacement for the Ryobi and Homelite 25cc to 26cc "Full Crank" and "Half Crank" engine platforms. Key compatible models include:
- Ryobi String Trimmers: RY252CS, RY253SS, RY251PH, RY254BC.
- Ryobi Brush Cutters: Various models utilizing the 25cc 2-cycle engine chassis.
- Homelite Trimmers: Fits several 25cc/26cc handheld models that utilize the 291337001 part number.
- Note: Always verify your original coil's mounting hole spacing and wire orientation, as some newer 25cc models may utilize a different module configuration.
When to Replace
- No Spark Condition: The most common failure; the trimmer will not start despite having fresh fuel and a clean carburetor because the plug is not firing.
- Thermal Failure (Hot Stalling): The engine runs perfectly for 10–15 minutes but dies suddenly as it gets hot and refuses to restart until the coil cools down.
- Engine Misfiring: Rhythmic stuttering or "popping" at full throttle, indicating the coil is struggling to maintain a steady electrical pulse under load.
- Hard Starting: A weak spark requires excessive pulls on the starter cord to get the engine to fire, often leading to a flooded engine.
- Visible Insulation Damage: The spark plug wire is frayed or showing signs of being chewed by rodents, which can cause the spark to jump to the engine block instead of the plug.
Installation Tips
- The Air Gap Rule: For the strongest spark, the air gap between the coil legs and the flywheel magnets should be approximately 0.010" to 0.012". Use a standard business card as a feeler gauge during installation.
- Check the Ground Path: Ensure the mounting surfaces on the engine block and the coil legs are clean and free of rust or oil. The coil grounds through its mounting bolts; a weak ground will cause a weak spark.
- Kill Switch Wiring: Be careful when reconnecting the small spade terminal for the stop wire. If this wire is pinched or grounds against the engine housing, the engine will never start.
- Flywheel Magnet Cleanup: While the cover is off, use a rag to wipe away any metal shavings or debris from the flywheel magnets to ensure the strongest possible magnetic induction.
- Gap the Spark Plug: Before installation, verify the spark plug gap (typically 0.025") to ensure optimal combustion and to prevent unnecessary stress on the new ignition module.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.4 ★★★★★
Based on 5 reviews
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Product Reviews
★★★★★ 5
Great value and a good chair
Color: Black Full Mesh, Style: Executive
Great chair for the price. Not as solid as an Ergo but it's not thousands of dollars either. It's pretty easy to assemble and the directions are good. It rolls well on LVP flooring and they offer 'upgraded' wheels at no cost from what I can tell. I didn't order them since the included ones work perfectly.
I'm 6'4" and both the seat and arm heights can be adjusted to fit me well. The mesh seat is comfortable and the back works fine. The only downside for me is that the lumbar support doesn't adjust quite high enough to actually reach my lumbar area, but I think it would work for most folks.
Overall it's hard to argue with the cost and even if it only lasts a few years it's worth the money.
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Reviewed in the United States on December 21, 2025
★★★★★ 5
Great Chair and Outstanding Customer Service
Color: Black Full Mesh, Style: Executive
I desperately needed a new office chair. I ordered this chair with the mesh seat and it spike up my sciatica. I reached out to the company and Alice took great care to address the issue. She sent me a new seat with a foam cushion and it resolved the issue immediately. The chair is incredibly comfortable with the lumbar support, adjustability and foot support. She also sent me upgraded wheels as my chair is on a thin chair mat on hard wood floors. Alice was extremely responsive with possible options and very thorough with instructions on how to replace the seat. It is a high quality chair that I anticipate will last me quite some time. I highly recommend this company and will definitely order products from them again should the need arise. Thank you, Alice!!
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Reviewed in the United States on June 10, 2026
★★★★★ 5
Well-packaged, quality materials, easy to assemble, very comfortable, great customer service
Color: Black Full Mesh, Style: Executive
When I received this package, I was surprised at how small/compact it was--hard to believe a high-back office chair could fit in that box! As I unpacked it, I was impressed by two things: first, how incredibly well it was packaged with an obvious intent to protect the components; second, how solid, heavy-duty, and high-quality those components were.
I got the box unpacked and read the instructions. They were simple and easy to understand, and included so many "here's a good tip" notes that it was obvious that a lot of thought and experience had gone into writing them. I found the chair simple to assemble and had it done in less than 15 minutes.
The chair was very adjustable. I was able to get the height to exactly what I wanted with no trouble at all. I was also able to adjust the height of the lumbar support, and to adjust how far it extended. There are a lot of adjustments you can make, the instructions lay that out quite thoroughly, too. As a result, the chair was very comfortable and helped me sit with a healthy posture.
I bought this chair because I had begun having an ache in my lower back, which I suspected was due to a chair I had been using for over 5 years. Within 3 days, the back pain was gone.
I was also very impressed with the customer service. Their manual mentions in multiple places things you can try if you have any issues, and always ends with "call us". Their team reached out to me after a few days to make sure I got the chair assembled with no issues and that it was comfortable. This was all part of the all-around quality of this purchase.
I'm very happy with this chair!
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Reviewed in the United States on June 5, 2026
★★★★★ 5
Comparable to Higher-End Chairs, Solid Build and Support Without the Premium Price
Color: Black Full Mesh, Style: Executive, Color: Black Full Mesh, Style: Executive
I’ve been using this chair for a bit now and it’s been a genuinely upgrade. The build quality stands out right away, it has real heft and doesn’t feel cheap or hollow. Everything fits together cleanly and once assembled it feels stable and planted. I’m over 6 ft and 200+ lbs and it handles that without any issue, no creaking or sense that it’s being pushed to its limits.
There’s enough space in the seat and back that you don’t feel boxed in. I added an extra ergonomic cushion and it still feels roomy, which isn’t always the case with chairs in this category. The adjustability helps a lot here, especially the lumbar support. Being able to move it up and down and also forward and back makes it easy to actually get it where you need it, instead of just accepting a fixed position. The armrests are also easy to dial in, especially if you’re switching between typing, reading, or leaning back a bit. The tilt range is useful, and the tilt tension is stronger than I expected. Even at my size it takes a bit of effort to lean back, which I see as a positive since it feels controlled and supportive rather than loose or overly easy to recline. The mesh is another strong point. It came in perfect condition, no snags, no loose threads, no rough edges anywhere. There weren’t any bits of untrimmed plastic on the frame either, which says a lot about the quality control. The mesh itself is taut with a bit of bounce, so it doesn’t sag but still has some give, which makes long sitting sessions more comfortable.
Assembly was straightforward and clearly thought through. The instructions are easy to follow, but what stood out were the built in redundancies that keep you from second guessing anything. There are multiple left and right indicators when installing the arms, a clear front facing marker for the gas lift, and the screws are labeled in the packaging so you’re not guessing which goes where. It’s one of the smoother assembly experiences I’ve had.
I also reached out to activate my warranty and had a very positive experience. I spoke with Alice who was very knowledgeable, quick, warm, and they went out of their way to help me with whatever I needed. When I inquired about the extra screw holes under the chair, she let me know that this was for a foot rest which was still in the production phase and unprompted offered to have one shipped to me when they were ready! There is an excellent team behind the product.
Overall: well built chair with good materials, thoughtful design choices, and good adjustability to make it work for different setups. It feels durable, comfortable over longer periods, and especially well suited if you need something that can handle a larger frame without sacrificing support.
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Reviewed in the United States on April 20, 2026
★★★★★ 5
Excellent chair/great support.
Color: Black Full Mesh, Style: Executive
Excellent, comfortable chair! I was surprised at how easy it was to assemble---but the directions were super clear and all the pieces and parts were labeled. Once I received the chair, I was also surprised with the email follow up from Alice at Molents. All this for a reasonably priced chair.
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Reviewed in the United States on April 1, 2026