90-01 CR500 BOYESEN RAD VALVE, BLOCK RAD03A, RAD-03A, RAD03A
4.1 Trustpilot 99.9% positive on eBay
Free UK delivery 2–4 business days
Spread the cost with 18+, T&Cs apply
Boyesen Rad Valve RAD-03A features carbon fiber reeds for enhanced performance. It maintains flow velocity and redirects the intake charge for even distribution to intake ports, resulting in sharper throttle response, added torque for improved performance on hills, through corners, and over jumps. This valve increases horsepower in low, mid, and top-end ranges. It is constructed from a one-piece aluminum casting and requires no trimming or plastic inserts.
- SKU
- 05-R03A
- Brand
- Boyesen
- Availability
- In Stock (4)
Fitments (12)
| Make | Model | Year |
|---|---|---|
| HONDA | CR 500 | 1990 |
| HONDA | CR 500 | 1991 |
| HONDA | CR 500 | 1992 |
| HONDA | CR 500 | 1993 |
| HONDA | CR 500 | 1994 |
| HONDA | CR 500 | 1995 |
| HONDA | CR 500 | 1996 |
| HONDA | CR 500 | 1997 |
| HONDA | CR 500 | 1998 |
| HONDA | CR 500 | 1999 |
| HONDA | CR 500 | 2000 |
| HONDA | CR 500 | 2001 |
- General Product Group
- Carburettor & Intake
- General Product Type
- Reeds - Valve
- Variant Id
- 208724
FULL DESCRIPTION
Boyesen Rad Valve - RAD-03A
The Boyesen Rad Valve is engineered to significantly enhance your motorcycle's intake performance. This advanced reed valve system is designed to optimize airflow and fuel mixture delivery to your engine's intake ports, resulting in noticeable improvements across the entire powerband.
Key Features:
- Includes advanced carbon fiber reeds for maximum performance gains.
- Maintains high flow velocity through the valve.
- Redirects the intake charge for more even distribution to the intake ports.
- Delivers sharper and quicker throttle response.
- Increases torque, providing better performance on hills, through corners, and over technical jumps.
- Boosts horsepower in the low-, mid-, and especially the top-end power ranges.
- Constructed from a durable, one-piece aluminum casting.
- Requires no trimming or plastic inserts for installation.
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.


