HOT START PLUNGER KIT ALL BALLS 46-2003 YAMAHA 03-13 WR YZ 250 450 F
4.1 Trustpilot 99.9% positive on eBay
UK delivery £4.99, free over £60 2–4 business days
The All Balls Hot Start Plunger Kit (46-2003) is a direct replacement assembly for the hot start circuit on select off-road models. It is designed for precise fit in Keihin FCR/FCR-MX carburettors, providing the components required to restore proper hot start function. This kit offers a direct OEM replacement at a fraction of the cost. It is CNC machined for precise fitment and shape, meeting or exceeding OEM standards. The kit contains all the components needed for rebuilding the choke plunger, including the plunger, O-rings, seals/gaskets, spring, screws, retaining nut, and boots and cable guide where required. The O-rings and rubber gaskets are made from NBR (nitrile) material, compatible with ethanol-blended fuels. Manufacturer: All Balls Racing. Manufacturer Part Number: 46-2003. Alternative/Stock Reference: Part No. 18-7257.AB.
- SKU
- 18-7257.AB
- Brand
- All Balls Racing
- Availability
- Out of Stock
Fitments (38)
| Make | Model | Year |
|---|---|---|
| YAMAHA | WR 250F | 2003 |
| YAMAHA | WR 250F | 2004 |
| YAMAHA | WR 250F | 2005 |
| YAMAHA | WR 250F | 2006 |
| YAMAHA | WR 250F | 2007 |
| YAMAHA | WR 250F | 2008 |
| YAMAHA | WR 250F | 2009 |
| YAMAHA | WR 250F | 2010 |
| YAMAHA | WR 250F | 2011 |
| YAMAHA | WR 250F | 2012 |
| YAMAHA | WR 250F | 2013 |
| YAMAHA | WR 450F | 2003 |
| YAMAHA | WR 450F | 2004 |
| YAMAHA | WR 450F | 2005 |
| YAMAHA | WR 450F | 2006 |
| YAMAHA | WR 450F | 2007 |
| YAMAHA | WR 450F | 2008 |
| YAMAHA | WR 450F | 2009 |
| YAMAHA | WR 450F | 2010 |
| YAMAHA | WR 450F | 2011 |
| YAMAHA | YZ 250F | 2003 |
| YAMAHA | YZ 250F | 2004 |
| YAMAHA | YZ 250F | 2005 |
| YAMAHA | YZ 250F | 2006 |
| YAMAHA | YZ 250F | 2007 |
| YAMAHA | YZ 250F | 2008 |
| YAMAHA | YZ 250F | 2009 |
| YAMAHA | YZ 250F | 2010 |
| YAMAHA | YZ 250F | 2011 |
| YAMAHA | YZ 250F | 2012 |
| YAMAHA | YZ 250F | 2013 |
| YAMAHA | YZ 450F | 2003 |
| YAMAHA | YZ 450F | 2004 |
| YAMAHA | YZ 450F | 2005 |
| YAMAHA | YZ 450F | 2006 |
| YAMAHA | YZ 450F | 2007 |
| YAMAHA | YZ 450F | 2008 |
| YAMAHA | YZ 450F | 2009 |
- General Product Group
- Handlebar & Controls
- General Product Type
- Hot Start Components
- Variant Id
- 288096
FULL DESCRIPTION
All Balls Racing Hot Start Plunger Kit
The All Balls Hot Start Plunger Kit is a direct replacement assembly designed to restore the proper function of the hot start circuit on select off-road motorcycles. This kit is specifically engineered for precise fitment in Keihin FCR/FCR-MX carburettors, addressing issues related to hard starting or a seized plunger.
Key Features:
- Direct Replacement: Offers an OEM equivalent at a significantly lower cost.
- Precision Machining: CNC machined components ensure accurate fit and shape.
- Quality Assurance: Meets or exceeds original equipment manufacturer standards.
- Complete Rebuild: Includes all necessary components for rebuilding the choke plunger assembly.
- Durable Materials: Features NBR (nitrile) elastomer for O-rings and rubber gaskets, ensuring compatibility with ethanol-blended fuels.
Kit Contents:
- Plunger
- O-rings
- Seals/Gaskets
- Spring
- Screws
- Retaining nut
- Boots
- Cable guide (where required)
Specifications:
- Manufacturer: All Balls Racing
- Manufacturer Part Number: 46-2003
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.


