Boyeson vs Vforce

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5/30/2018 6:03 PM

Looking for some insight on differences between the two. Any advantage of one compared to the other? Bike is an 05 YZ250!

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2017 RMZ450
2005 YZ250-sold :,(
1998 YZ250
2005 KX250F

80% of the time it works every time
IG @2HRacing
Thanks to : Factory Effex, N2Dirt, Acerbis, DT1, Fasthouse, Matix, FMF, ASV, 100% & Mika Metals

5/30/2018 6:14 PM

I’ve had both on my KX250.
I prefer the Boyesen reed block. Quality of materials and finish can’t be compared.
Also, the Boyesen seems to be more specific to years (as in it gets slightly tweaked when needed, even within the same model from year to year) whereas the Vforce doesn’t.

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"Nothing happens until something moves"

5/30/2018 6:17 PM

I think vforce more costly, may vary. Pretty sure boyesen adds mid-top, while other is more bottom-mid. I prefer boyesen myself.

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5/30/2018 6:41 PM

loftyair wrote:

I think vforce more costly, may vary. Pretty sure boyesen adds mid-top, while other is more bottom-mid. I prefer boyesen ...more

I've experienced the opposite effect with both reed blocks.
When I picked an 04 YZ250 a few yrs back I asked Larry Brooks this question. His response was the oem reed cages will provide the best performance while the aftermarket ones will move the power in the curve.
Similar to an oem expansion chamber vs. the aftermarket ones.
Depending on where you want the power you can choose one or the other.

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Speak softly and carry a big stick.

5/30/2018 6:50 PM

Happy with my vforce. Never used boyesen so I can’t comment on them. Wouldn’t say it added any more power but it’s snappier for sure

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2011 Yamaha YZ 250 -MX
1996 Yamaha Banshee 350 -Trails
1982 Chevy S10
2005 Pontiac GTO -451rwhp

5/31/2018 6:52 AM

Boyesen has a 100% satisfaction guarantee. So, if you dont like it, you can return it.

Boyesen valves are made specific to that make model....Vforce is just one size fits all, plus I'm not a fan of the cheap plastic.

You will get different power characteristics from the 2 intake systems. It really depends on what suites you. I personally like Boyesen

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5/31/2018 7:17 AM

Never had Boyesen but did have VForce on my YZ250 and like eric513anderson it definitely made it snappier. I like their products. No complaints.

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"Sorry Goose, but it's time to buzz the tower."

5/31/2018 7:21 AM
Edited Date/Time: 5/31/2018 7:22 AM

Have used both. Both great. I go with boyesen due to their amateur support program. they make nice stuff! And the parts girls are always friendly and return phone calls promptly.

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GP740
Since 1987

5/31/2018 7:47 AM

I think they’re both great. The V-Force seems to be snappier in low-mid and mid. It’s certainly part of the art of fine tuning your engines power delivery to your liking. When it came time to get a silencer for my ‘05 YZ125 (it only had an SA Pro when I bought it), I went with the standard vs the shorty to go with the V-Force and FMF Fatty it already had.

Don’t know if this is still an “issue”, but when I ran Boyesen RAD valves on my mid-late nineties KX250’s, it was a little tight in the airbox/carb/intake area. Meaning it took a little more coaxing getting the subframe / airbox on and off as the valve took up a little more room front to back. Even though V-Force wasn’t available at the time, the RAD valve seemed to compliment the already stout KX250 power delivery with an FMF Fatty.

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5/31/2018 8:48 AM

Thanks for the info guys! So basically VForce adds low to mid while Boyeson adds mid to top.

One other question, did any of you have to make jetting changes? I was reading some reviews and didn't see anyone talk about jetting with the VForce, but a few people talked about having to go much leaner with the Boyeson.

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2017 RMZ450
2005 YZ250-sold :,(
1998 YZ250
2005 KX250F

80% of the time it works every time
IG @2HRacing
Thanks to : Factory Effex, N2Dirt, Acerbis, DT1, Fasthouse, Matix, FMF, ASV, 100% & Mika Metals

5/31/2018 8:57 AM

I put a vforce v3 on my 06 yz250 it didn't do anything really. It's also the same one used on 03 n up rm 250's. It made the power a little smoother i went back to the stock setup cause it was snappier.

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