PISTON KIT 06-09 KX250F 77.00, PROX 01.4337.B
4.1 Trustpilot 99.9% positive on eBay
Free UK delivery 2–4 business days
Spread the cost with 
18+, T&Cs apply
ProX 4-stroke piston kit with a 77.00mm bore. This kit includes the piston, piston rings, wrist pin, and circlips. ProX pistons are precision machined using state-of-the-art CNC equipment and utilize a low-expansion, low-friction piston alloy. The piston features an OEM-style tin coating to aid in the break-in process. Replacement parts are available including piston rings (02.4336), piston pin (04.1645), and piston clips (05.1612C). Manufacturer part number: 01.4337.B.
- SKU
- 56-W4920.B.PX
- Brand
- Pro-X Racing
- Availability
- In Stock (1)
Fitments (5)
| Make | Model | Year |
|---|---|---|
| KAWASAKI | KX 250F | 2006 |
| KAWASAKI | KX 250F | 2007 |
| KAWASAKI | KX 250F | 2008 |
| KAWASAKI | KX 250F | 2009 |
| KAWASAKI | KX 250F | 2010 |
- General Product Group
- Engine
- General Product Type
- Pistons & Kits
- General Size
- 77mm
- Variant Id
- 256370
FULL DESCRIPTION
ProX Piston Kit 77.00mm Bore
This ProX Piston Kit is designed for high-performance 4-stroke engines. It is precision machined using the latest CNC equipment and constructed from a low-expansion, low-friction piston alloy, mirroring the materials used by major Japanese engine manufacturers. This kit is ready for immediate installation and includes all necessary components for a complete engine rebuild.
The included piston features an OEM style tin coating, which aids in the crucial break-in process when your machine is first started, promoting longevity and optimal performance from the outset.
Key Features:
- Piston Kit with a 77.00mm bore diameter.
- Supplied complete with piston rings, wrist pin, and circlips.
- Precision machined on state-of-the-art CNC equipment.
- Constructed from a low-expansion, low-friction piston alloy.
- Features an OEM style tin coating for assisted break-in.
- Designed for optimal performance and engine longevity.
Replacement Parts Included:
- Piston Rings
- Piston Pin
- Piston Clips
QUESTIONS? JUST ASK
Talk to John or Phil. Real people, Monday to Friday, 10:00 to 17:00.
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.
UK delivery is £4.99, or free on orders over £60. Orders ship within 3 working days, then delivery takes 2–4 business days. 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.
More answers in our FAQ.
Trade pricing available
Buying parts for your business? Apply for a 2BrosParts trade account.