17/18 TC250/SX Vforce or Boyesen Rad Valve

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5/9/2018 11:59 AM

Anyone ran both? anyone have either and would like to comment on the the gains over stock? Trying to decide which one to possibly get. I know Vforce tends towards enhanced bottom/mid, while the rad tends towards top/overev, but would appreciate real world opinions. I haven't been able to find any comparisons out there or even any reviews on the RC2 Rad valve, hoping someone here is running it. Thanks

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5/9/2018 2:21 PM

I was actually looking for this info this morning and didn't come up with anything unless you want to talk the vforce 3 and the old style rad valve on a yz125 lol. I'd like more over rev on my '18 250sx and haven't decided on what way to go.

"As a rule of thumb, when the MXA crew wants more midrange, we call Moto Tassinari, and when we want to increase high rpm power, we hit up Boyesen"

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2018 KTM 250sx
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5/9/2018 2:54 PM

A Pro Circuit pipe and silencer added more top end and over rev to my '17 TC250. However, I would probably get it ported before buying that setup again.

On my older CR250, the Rad valve was harder to jet than stock. On a different CR250, the Vforce was a little more responsive at lower RPMs. Neither were worth the price.

Also to note, after some light sanding reeds on my my stock reed cage sit flat and work well.

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5/9/2018 3:11 PM
Edited Date/Time: 5/9/2018 8:37 PM

Dupe.

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5/9/2018 3:28 PM

I bought the Vforce reeds for my 17 TC250 because everyone was talking about how bad the stock reed set up was on the 17 250's. I noticed no change in performance and would not buy them again. Haven't used the rad valve so I can't offer any comparison between the two.

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5/9/2018 4:53 PM

I have the Vforce 4R but haven't compared the 2, sorry.

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5/11/2018 3:28 PM

Thanks for all the feedback!

I too added a pro circuit works pipe/silencer combo and it helped it out greatly, also went to a 49t rear sprocket and am really happy with the mods. Hopefully some reviews or something pop up for the boyesen. Anyone had motor work done to these bikes?

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7/6/2018 7:20 PM

Just got my boysen rad valve tonight. I’ll throw it on Sunday and see if there is a difference on my 18 tc250.

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7/7/2018 4:45 AM

Been running the RC2 for some time now, I have the VF4R too. The quality is better on the RC2, runs cleanly. Not much difference with the 3 running wise, steady tuning properties is the biggest plus.

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vomiting equals disqualification.

9/26/2018 6:25 AM

nascarnate326 wrote:

Just got my boysen rad valve tonight. I’ll throw it on Sunday and see if there is a difference on my 18 tc250.

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How did this work out?

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