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Ships within 48 hours · Estimated delivery Aug 11 - Aug 16
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Description
Namura Piston Kit 77.97mm KTM 250SXF '16-'21 / 250XCF '16-'22Namura provides high quality piston options to suit a wide range of applications, including direct OEM replacements, high compression variants, and multiple oversizes. B (0. 01 mm) and C (0. 02 mm) oversizes are also available, helping to extend the service life of expensive plated cylinders. Select applications are supported with big bore piston kits. With the addition of MOS2 coating and hard anodising, Namura delivers improved performance and
Namura provides high-quality piston options to suit a wide range of applications, including direct OEM replacements, high-compression variants, and multiple oversizes. B (0.01 mm) and C (0.02 mm) oversizes are also available, helping to extend the service life of expensive plated cylinders. Select applications are supported with big-bore piston kits. With the addition of MOS2 coating and hard anodising, Namura delivers improved performance and durability, without the premium price.
Features:
- MOS2 (Teflon/Molybdenum) Coated Skirts: Applied using a rolled-on process for a bond up to 10 times stronger than typical spray coatings. Improves heat transfer, reduces friction, and helps prevent cold seizures.
- Machined Smooth Heads: Reflect combustion heat and minimise carbon build-up, protecting the piston crown. Testing indicates potential gains of up to 6% in horsepower and fuel efficiency.
- Anodised Domes: Enhance heat resistance and durability, with up to 75% greater strength compared to non-anodised pistons.
- Hypereutectic Casting Process: Increases silicon content to reduce expansion, improve wear resistance, and withstand higher cylinder temperatures.
- 0.50 mm oversize up to 100.47 mm, with a 9.2:1 standard compression ratio.
- Includes piston (individually wrapped), OEM-quality rings (boxed separately), wrist pin, and circlips.
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 17 reviews
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Product Reviews
★★★★★ 5
The best office chair!!!
Number of Items: 1
The chair is great quality, sturdy, and was easy to put together. Looks just like the photos and video. It is SUPER comfortable - the most comfortable chair ever! If you’re looking to purchase an office chair/ desk chair - this is the one! The price was reasonable and I would 100% recommend!
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Reviewed in the United States on March 27, 2026
★★★★★ 5
Great chair, only one issue.
Number of Items: 1
As someone who is exactly 6ft tall, this chair is just about perfect for my height and body type. High quality materials, adjustable lumbar support, very ergonomic. Visually, it works well with my desk setup. It has already helped me improve my posture ten-fold.
My only complaint might be that the tension on the recline joint is too much. Twisting it to the loosest setting doesn’t feel loose enough, you’ll need to put your feet up on something to recline comfortably and stay in that position. Other than that, great chair. I don’t see myself returning this one.
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Reviewed in the United States on May 2, 2026
★★★★★ 5
Chair
Number of Items: 1
Very comfortable and easy to assemble
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Reviewed in the United States on June 1, 2026
★★★★★ 4
Get this chair if it is on sale for $100 or less!
Number of Items: 1
I am a 180lb, 5'8" tall male.
I needed an office chair that would support and cover my entire back, shoulders, and neck, while locking at 90° upright, and allow me to sit with my hips over knees (slightly) with my feet flat on the floor. I also needed the arms of the chair to support my arms and shoulders in a neutral resting position, as well as move up and out of the way.
This chair did all of that for just over $100 and next day delivery. I'm happy with it and will be keeping it long term.
Build time was 20 minutes. All needed tools and materials were included. Instructions were clear and easy to follow.
Components appear to be properly made, well fitting, and durable. Everything works properly.
The arms are the proper height for me. The seat cushion and lumbar curve are good. The wheels fit through doorways just enough. The seat height can be set both adequately low and high for my height and needs. The tilt sensitivity is adjustable via a knob under the seat. The position lock works properly in the upright position.
The only cons for me:
Position lock is not available in recline.
The neck support is not padded enough and uncomfortable to rest your neck against for long.
The neck support mechanism cannot extend closer to or further away from the back of your neck. It can only be moved higher or lower. The mechanism can also be tilted up or down to change its angle.
This chair is worth the $100 I paid.
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Reviewed in the United States on February 16, 2026
★★★★★ 5
Comfortable chair that works great for long hours
Color: Black
I’ve been using this office chair for a few days and it’s been very comfortable for working and longer desk sessions. The high back design and ergonomic support help maintain good posture, while the cushioning stays comfortable throughout the day. The chair feels sturdy and stable, and the 330 lb capacity gives it a solid, durable feel. It also rolls smoothly and quietly, which is nice when moving around the workspace without creating a lot of noise. Overall, it was easy to assemble, looks professional, and offers great value for the money.
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Reviewed in the United States on June 10, 2026