SKU: 28001376226

Namura Piston Kit 71.45mm – Yamaha YFM250 Big Bear 4x4 '07–'09

Sale price$137.69 Regular price$152.99
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Ships within 48 hours · Estimated delivery Aug 1 - Aug 6

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Description

Namura Piston Kit 71.45mm – Yamaha YFM250 Big Bear 4x4 '07–'09Namura 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:
  1. 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
SKU: 28001376226

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4.4 ★★★★★
Based on 25 reviews
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K
Verified Purchase
Kathi C.
Boise, US
★★★★★ 5
Very versatile and easy to install too!
Size: 5.5 INCH
Very sturdy ! Worked perfect for our outdoor location and is holding the trellis to our home... WONDERFUL Support !
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 7, 2025
S
Verified Purchase
steve smith
Draper, US
★★★★★ 5
Great Quality
Size: 9.25 INCH
Why did you pick this product vs others?: Looked sturdy and was a great price for heavy duty brackets
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 20, 2025
A
Verified Purchase
Aj
Phoenix, US
★★★★★ 5
Keep ample supply of batteries nearby
Color: Graphite, Style: Keyboard
his keyboard does exactly what I needed it to do—stay quiet. No loud clack-clack echoing through calls, even on sensitive audio. It’s a solid choice if you’re working around microphones or just prefer a softer typing sound. Connectivity was easy, and it’s been reliable so far. The keys feel comfortable once you get into a rhythm. That said, the spacing is just slightly different from my previous keyboard—barely a millimeter or so—but it’s enough to throw you off at first. There’s definitely a short adjustment period before your fingers recalibrate. Also, it doesn't blow through batteries super fast, but I promise you'll want some spares handy because Murphy's Law dictates that you will be in the middle of something important when they go out! Overall, a dependable, low-noise keyboard that works well once you get used to the feel.
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Reviewed in the United States on May 5, 2026
B
Verified Purchase
BPalmer
Cuba, US
★★★★★ 5
I am very happy!
Color: Graphite, Style: Keyboard
No issues. Keyboard works great and connects flawlessly to my laptop. Can't imagine any other problems. It does make a little clicky noise when typing but not overly loud or annoying and not as loud/annoying as my work computer keyboard. That keyboard has a very thin, plasticy, sharper, cheaper sounding click and this has a more subdued, heavier duty sounding click. I like it much better. It seems dampened maybe. It's hard to describe sounds but I find it way less annoying than any other keyboards I have used. I am extremely happy with its size and still having the full keyboard and numbers.
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Reviewed in the United States on December 28, 2025
A
Verified Purchase
Andy Bui
Waukegan, US
★★★★★ 5
Simple, reliable, and very comfortable to use
Color: Graphite, Style: Keyboard
This keyboard is exactly what I was looking for. Setup was quick and easy, and the Bluetooth connection has been stable with no lag or dropouts. The keys are comfortable and quiet, making it great for everyday typing at home or in the office. I really like having the full numpad while still keeping a relatively compact size. The keyboard feels sturdy, and the spill-resistant design gives some peace of mind. Battery life has been excellent so far, and it works smoothly across both Windows and Mac. Overall, it’s a solid, no-frills keyboard that does its job well. Great quality and performance for the price.
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Reviewed in the United States on January 15, 2026

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