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Boyesen Rad Valve
Boyesen Rad Valve

$ 147.99 - $ 251.99
8% Off - Save up to $21.00

Select your bike to see if this reed valve system fits
Description See Also: 8 Reviews 12 Questions Fitment Part Numbers
Item #BOY000C

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8 Reviews
4.9 out of 5 stars
5 Star   7 4 Star   1 3 Star   0 2 Star   0 1 Star   0
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All Reviews
Verified Purchaser
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Style 5/5
Runs Great

I paired the reeds with new FMF pipe & R304 shorty on a 2014 YZ125 I bought used. Everything runs great but I never road the stock reed valves so don’t know how it compares. But I am happy.

Verified Purchaser
Sand dunes
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Style 5/5
Worth the purchase

I have always ran the Rad Valve on all my bikes. Never been disappointed! Bolts right on every time. I’m a dune rider and makes that 2 stroke sing!!

Verified Purchaser
SW Florida
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Style 5/5

You can't go wrong with Boyesen reeds. The Rad valve is awesome no more rubber intakes.

Top 250 Contributor Verified Purchaser
Durability 4/5 Ease of Installation 5/5 Performance 4/5 Style 3/5

Great 2stroke performance part. Great for all around better performance.
Should be noticed especially on bottom end, holeshots and cornering. I would recommend a rad valve to anyone thinking about it.

Verified Purchaser
San Diego, CA
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Style 5/5
Awesome product

The rad valve was exactly what my 2006 Rm250 needed. My stock intake was dry rotted and needed to be replaced so rather than spending the money on a new OEM part I went with Boyesen. The bike runs so much better now from the bottom to the top. I have no hesitation at all, just quick, crisp revs. It also made the hit of the power band more predictable which helps out a lot on the track. The product comes with everything needed to install including an intake gasket, intake coupling, and clamps plus they give you detailed instructions and suggested jetting settings. I will put one on every 2 stoke I own!

Verified Purchaser Top 1000 Contributor
Idaho, USA
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Style 5/5
High quality part.

I've always been a big fan of the Boyesen Rad Valve. This is my 4th one and I have no reason not to keep coming back. There is always a noticeable performance boost and the fit and finish is great. The housing is tough and the reed petals hold up as long or longer than stock and/or other brands.

Verified Purchaser
San Luis Obispo , CA
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Style 5/5

I decided to try out the Rad Valve on my Rm 125 and am very satisfied. Being very sensitive to Jetting I had some concerns. It seems like the consensus is that the Rad Valve requires more jetting changes then the V force but is potentially a better mod. I believe this is true. Although I noticed an increase in performance right away. It became more noticeable when I leaned the main out a little more. The Rad Valve improved performance all over the Rpm range.
Will it make you faster? Probably not.
Is it worth the money? That depends on how much money you make and if you know how jet your bike. (MXA's secret jetting specs is a good place to start.) Or the FMF website!! =)
Will I Install a Rad Valve on every 2 stroke I own from now on. Yes!!

Top 1000 Contributor
Athens Tn.
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Style 5/5
Proven quality.

Excellent performance as always.

12 Questions
Answered:   11
Not Yet:   1
Q: Can this be used in conjunction with the moose racing spacer or a spacer in general? 
21 days ago
Top 10
21 days ago
A: That question would be better answered by the Tech Dept @ Boyesen. They would have possibly doe the R&D to be able to help you further. Boyesen Racing Phone: (610) 756-6818
Q: Does it have the carbon fiber reeds?
1 month 28 days ago
Top 10
1 month 28 days ago
A: It utilizes a carbon fiber top reed and a durable fiberglass / epoxy bottom reed.
Yz85 rider
Q: Does this come with all the bolts?
3 months 4 days ago
Q: Does this rad valve come with reeds?
Over 6 months ago
Top 25
Over 6 months ago
A: Yes it does! Get out and rip!
Q: Is there a replacement gasket for this part?
Over 10 months ago
Boyesen Rad Valve RAD-21J 2005 rm125
Top 10 Contributor
Over 10 months ago
A: You'll just need to order a OEM gasket for it.
Q: Does it include the intank boot that connects to the carb?
2 years 5 months ago
My intank boot for my Yz 85 is dry rotted
Expert MotoSport Staff
2 years 5 months ago
A: Yes. Carb boot, Carb boot clamp and gasket provided. No modifications required.
Q: Will a 2008 yz85 rad valve fit a 2015 yz85?
2 years 9 months ago
MotoSport Staff Expert
2 years 9 months ago
A: Yes the Boyesen Rad Valve (RAD-30C) would be the same for the Yamaha YZ85 2002-2016.
Q: Boyesen rad valve
Over 4 years ago
Hi, will this replace the stock rubber part that the carb mounts to, because on my sons bike its all dry rotted. Trying to decide weather to buy the stock carb holder and v-force reeds or just the boyesen. If the boyesen will take care of the carb holder issue it will end up being cheaper for me. Thanks in advance
MotoSport Staff
Over 4 years ago
A: The Boyesen Rad Valve will come with the boot so you will not need to buy a replacement OEM one.
Q: Boyesen rad valve VS. v force
Over 4 years ago
I want to add a little hp to my bike but im not sure which one to pick boyesen or v force some one help me decide.
Expert MotoSport Staff
Over 4 years ago
A: I would say either would be a good choice. The V-Force Reed Valve systems are by far the most popular choice when replacing your Reed Valve. Also, the V-Force reeds simply snap into place in the reed valve so changing the reeds is extremely quick and easy.
Q: What do I order for replacement reeds? I have the rad block already
Over 5 years ago
My reeds are worn out and one is broken. I don't see replacements for the rad reeds.
MotoSport Staff
Over 5 years ago
A: The Rad Valve takes specific reeds from Boyeseen. If you can give us a call, we can get you taken care of with pricing and availability of the correct reeds for your 1994 YZ125.
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See Fitments
# Part Numbers
Product Variant Manufacturer Part #
Boyesen Rad Valve RAD-11K
Boyesen Rad Valve RAD-33J
Boyesen Rad Valve RAD-36M
Boyesen Rad Valve RAD-40A
Boyesen Rad Valve RAD-41C
Boyesen Rad Valve RAD-42E
Boyesen Rad Valve RAD-01E
Boyesen Rad Valve RAD-01J
Boyesen Rad Valve RAD-03A
Boyesen Rad Valve RAD-15
Boyesen Rad Valve RAD-10A
Boyesen Rad Valve RAD-10E
Boyesen Rad Valve RAD-20A
Boyesen Rad Valve RAD-21J
Boyesen Rad Valve RAD-24K
Boyesen Rad Valve RAD-30C
Boyesen Rad Valve RAD-34J
Boyesen Rad Valve RAD-01A
Boyesen Rad Valve RAD-01F
Boyesen Rad Valve RAD-01I
Boyesen Rad Valve RAD-02F
Boyesen Rad Valve RAD-04A
Boyesen Rad Valve RAD-12C
Boyesen Rad Valve RAD-12E
Boyesen Rad Valve RAD-12J
Boyesen Rad Valve RAD-13
Boyesen Rad Valve RAD-25
Boyesen Rad Valve RAD-30A
Boyesen Rad Valve RAD-34I
Boyesen Rad Valve RAD-35A
Stock Motor RAD-36A
Boyesen Rad Valve RAD-40B
Boyesen Rad Valve RAD-42D
Boyesen Rad Valve RAD-46
Boyesen Rad Valve RAD-62