PISTON KIT 77.00mm 2014-2015 YZF250 NAMURA FORGED FX-40037-C
4.1 Trustpilot 99.9% positive on eBay
Delivery to United States 5–8 business days
Spread the cost with 
Namura Technologies forged piston kit FX-40037-C is a complete forged piston assembly for 250cc off-road engines. It is intended for top-end servicing in standard 77mm class applications. This kit is supplied with matched rings and installation hardware. Features include a forged piston kit for off-road engine rebuilds, piston, OEM-quality piston rings, wrist pin, and circlips. Specifications include a size of 77mm, piston diameter of 77.00mm, bore size of 76.97mm, oversize of +0.02mm (Size C), and a compression ratio of 13.5:1 (high compression). Cross-reference OEM part numbers include FX-40037-C, NX-20030R, 56-W4961.C.NT, 0758891090371, and 1SM-11631-01-00.
- SKU
- 56-W4961.C.NT
- Brand
- Namura Technologies
- Availability
- In Stock (9)
Fitments (29)
| Make | Model | Year |
|---|---|---|
| YAMAHA | WR 250F | 2015 |
| YAMAHA | WR 250F | 2016 |
| YAMAHA | WR 250F | 2017 |
| YAMAHA | WR 250F | 2018 |
| YAMAHA | WR 250F | 2019 |
| YAMAHA | WRF 250 | 2014 |
| YAMAHA | WRF 250 | 2015 |
| YAMAHA | WRF 250 | 2016 |
| YAMAHA | WRF 250 | 2017 |
| YAMAHA | WRF 250 | 2018 |
| YAMAHA | YZ 250F | 2014 |
| YAMAHA | YZ 250F | 2015 |
| YAMAHA | YZ 250F | 2016 |
| YAMAHA | YZ 250F | 2017 |
| YAMAHA | YZ 250F | 2018 |
| YAMAHA | YZ 250FX | 2014 |
| YAMAHA | YZ 250FX | 2015 |
| YAMAHA | YZ 250FX | 2016 |
| YAMAHA | YZ 250FX | 2017 |
| YAMAHA | YZ 250FX | 2018 |
| YAMAHA | YZ 250FX | 2019 |
| YAMAHA | YZF 250 | 2014 |
| YAMAHA | YZF 250 | 2015 |
| YAMAHA | YZF X 250 | 2014 |
| YAMAHA | YZF X 250 | 2015 |
| YAMAHA | YZF X 250 | 2016 |
| YAMAHA | YZF X 250 | 2017 |
| YAMAHA | YZF X 250 | 2018 |
| YAMAHA | YZF X 250 | 2019 |
- General Product Group
- Engine
- General Product Type
- Pistons & Kits
- General Size
- 77mm
- Variant Id
- 281071
FULL DESCRIPTION
Namura Forged Piston Kit 77.00mm
This Namura Technologies forged piston kit is designed for top-end servicing of 250cc Yamaha off-road 250F engines. It is intended for standard 77mm bore applications and provides a complete forged piston assembly. This kit is supplied with all necessary components for installation, ensuring a comprehensive rebuild solution.
Key Features:
- Forged piston kit ideal for off-road engine rebuilds
- Includes a high-quality forged piston
- Comes with a complete set of OEM-quality piston rings
- Supplied with the necessary wrist pin for assembly
- Circlips are included for secure installation
Specifications:
- Piston Diameter: 77.00mm
- Bore Size: 76.97mm
- Oversize: +0.02mm (Size C)
- Compression Ratio: 13.5:1 (High Compression)
Cross-Reference Part Numbers:
- FX-40037-C
- NX-20030R
- 1SM-11631-01-00
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.