PISTON KIT 40.00mm 08-13 POLARIS 50, NAMURA NA-50015-4 ATV QUAD, Polaris 50 OUTLAW 2008-2019, 50 PREDATOR 2007, YAMAHA YFZ50 2017-21
4.1 Trustpilot 99.9% positive on eBay
Delivery to United States 5–8 business days
Spread the cost with 
Namura piston kit with 40.00mm standard bore. This cast piston assembly features high silicone content for increased strength, an anodised dome for improved heat resistance and lifespan, and Molybdenium Teflon-coated skirts to minimise resistance and wear. Supplied as a complete kit, it includes piston, rings, pin, and clips. Bore size 40.00 mm, piston diameter 39.98 mm. Part number 56-W837.100.NT. Cross-reference OEM part numbers: Namura NA-50015-4, CLIP-PISTON PIN 0453432, PISTON-PREDATOR 50 0453833, PIN-PISTON, PREDATOR 50 0453832, SET-RING, PISTON, PREDATOR 50 0453834. Manufactured by Namura Technologies. Weight 106 grams.
- SKU
- 56-W837.100.NT
- Brand
- Namura Technologies
- Availability
- In Stock (6)
Fitments (13)
| Make | Model | Year |
|---|---|---|
| POLARIS | OUTLAW 50 | 2008 |
| POLARIS | OUTLAW 50 | 2009 |
| POLARIS | OUTLAW 50 | 2010 |
| POLARIS | OUTLAW 50 | 2011 |
| POLARIS | OUTLAW 50 | 2012 |
| POLARIS | OUTLAW 50 | 2013 |
| POLARIS | OUTLAW 50 | 2014 |
| POLARIS | OUTLAW 50 | 2015 |
| POLARIS | OUTLAW 50 | 2016 |
| POLARIS | OUTLAW 50 | 2017 |
| POLARIS | OUTLAW 50 | 2018 |
| POLARIS | OUTLAW 50 | 2019 |
| POLARIS | PREDATOR 50 | 2007 |
- General Product Group
- Engine
- General Product Type
- Pistons & Kits
- General Size
- 50.00mm
- Variant Id
- 257974
FULL DESCRIPTION
Namura Piston Kit 40.00mm Standard Bore
Enhance the performance and durability of your 50cc engine with this premium piston kit from Namura. Engineered for a precise 40.00mm standard bore, this kit is designed to meet the demanding needs of Polaris 50cc models and Yamaha YFZ50. The cast piston construction features a high silicone content for exceptional strength and reliability under strenuous operating conditions. Experience improved heat resistance and extended lifespan thanks to the anodised dome, while the Molybdenium Teflon-coated skirts significantly reduce friction and wear, ensuring smoother operation and increased engine efficiency.
Key Features:
- High-quality cast piston with superior strength from high silicone content.
- Anodised dome provides enhanced heat resistance for greater durability.
- Molybdenium Teflon-coated skirts minimise wear and reduce friction for optimal performance.
- Supplied as a complete assembly for straightforward installation, including piston, rings, pin, and clips.
- Standard bore size: 40.00 mm.
- Piston diameter: 39.98 mm.
- Manufactured by Namura Technologies for trusted quality.
QUESTIONS? JUST ASK
Talk to John or Phil. Real people, Monday to Friday, 10:00 to 17:00 (UK time).
Check the fitment table on this page against your make, model and year. Not sure? Call or email us and we will check it for you before you order.
Yes. We ship from the UK. Orders ship within 3 working days, then delivery to the United States takes 5–8 business days. The delivery price is shown at checkout before you pay. Delivery details
Yes. You have 14 days from delivery to return it, unused and in its original packaging. Contact us first and we will send you the return instructions. Returns policy
By card, PayPal, Apple Pay or Google Pay, or spread the cost with Klarna. Payment is taken securely by Stripe, and the options for your order are shown at checkout.
Any customs duties or import taxes charged in the United States are paid by you when the parcel arrives. Any tax we collect ourselves is shown at checkout before you pay.
More answers in our FAQ.
Trade pricing available
Buying parts for your business? Apply for a 2BrosParts trade account.