Boyesen Rad Valve

Boyesen Rad Valve
Boyesen Rad Valve

$143.99 - $161.99
10% Off - Save up to $18.00

  • Description
  • 3 Reviews
  • 6 Questions
  • Fitment
Item #BOY000C
  • One piece design.
  • Easy installation.
  • The intake charge is redirected for more even distribution of the intake ports.
  • Constant flow velocity is maintained for instant throttle response and more horsepower.

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3 Reviews
5.0 out of 5 stars
5 Star   3 4 Star   0 3 Star   0 2 Star   0 1 Star   0
Top 1000 Contributor Verified Purchaser
Idaho, USA
Durability   Ease of Installation   Performance   Style  
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   Ease of Installation   Performance   Style  

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 500 Contributor
Athens Tn.
Durability   Ease of Installation   Performance   Style  
Proven quality.

Excellent performance as always.

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6 Questions
Answered:   6
Not Yet:   0
Q: Will a 2008 yz85 rad valve fit a 2015 yz85?
2 months 28 days ago
Expert MotoSport Staff
2 months 27 days ago
A: Yes the Boyesen Rad Valve (RAD-30C) would be the same for the Yamaha YZ85 2002-2016.
Q: Boyesen rad valve?
1 year 8 months 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 Expert
1 year 8 months 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?
2 years 2 months 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.
MotoSport Staff Expert
2 years 1 month ago Location: Portland, OR, USA
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.
Location: Ohio
Q: What do I order for replacement reeds? I have the rad block already?
2 years 10 months ago
My reeds are worn out and one is broken. I don't see replacements for the rad reeds.
MotoSport Staff
2 years 10 months ago Location: Portland, OR, USA
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.
Location: Longview, Texas
Q: Boyesen vs V Force?
2 years 11 months ago
Why do the parts look so much different? The V Force is a cage that slips into the existing port on the intake and the Boyesen looks like it's an add on to the engine?
MotoSport Staff
2 years 11 months ago Location: Portland, OR, USA
A: They really are both trying to accomplish the same thing. Realistically they they are pretty much the same except Boyesen integrates the intake manifold into their reed block instead of using the stock one. Both are trying to create a less turbulent and effective intaker charge into the engine, and they both do accomplish this. Typically the Boyesen valves are known to produce a little more bottom end, and the V Force's rev a little more freely. Personally on my 125's, i have always ran the V force's.
Location: Argentina
Q: Do you have the reeds for this part??
Over 3 years ago
It is for a suzuki rm 125 1998 with this boyesen kit.
MotoSport Staff
Over 3 years ago Location: Portland, OR, USA
A: We can get you the replacment Boyesen Rad Valve reeds for your 1998 RM125. Unfortunately we do not stock them and will have to order them in for you. Please give us a call at your convenience and we can get you taken care of for this item.
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