V Force 4 Reeds

[smelonas]

Searched. Found nothing. Probing to see if anyone has tried the new plastic from Moto Tass. Have nothing against running a 3, might as well as if the 4 is worth the coin.

There's a whole long story behind the question, the short is that intake boot is fragged, didn't want to spend $80 for a new one, reeds were chipped, bought boyesen for the intake boot, did research, found they actually kill the KDX in its tracks in a certain sense, now looking to possibly machine rad valve down to factory intake shape and put v-force after of it, then port/port match the rad valve intake manifold. Again, more to it than meets the eye, this is a very far zoomed out synopsis of my current thought process . Lot of work and money for a stupid reed valve system. Again, there is more to the story that is irrelevant to if someone has tried the vforce 4.

Money and cost is a non-issue if you couldn't figure that out on your own.

Happy memorial day. Thank you to those that kept the world safe during the 20th century and all those before and after!

[KDXGarage]

I didn't even know they had started offering a "4" version for the KDX. They didn't when the "4" first came out. Cool to see that they do make one.

https://mototassinari.com/finder-results/v4r13g.html

[smelonas]

Then test subject I shall be..

[KDXGarage]

Let us know how it turns out. Thanks for spurring me to research it further.

[smelonas]

Problem is that riding season just ended here so will be 4+ months before I really get to experiment with this, but I will try to post my experience when it happens!

[KDXGarage]

Is it already that hot or law related??

[smelonas]

Is it already that hot or law related??

Yessir. Texas is under the torch right now. Which is odd because as I type this we are getting nickel size hail coming down like a downpour. But it's already 100 almost everyday, so I might hit the MX tracks, if they decide to open before noon, a few times this summer, but generally, the season is over here. I won't take the KDX though, probably the CR125

[KDXGarage]

Wow. That is rough. I think we are mid 80's of late here in north Alabama.

[SS109]

Yessir. Texas is under the torch right now.

You just gotta get up earlier! That's what we do here in Arizona. I like to be on the trail by 6am at the latest during the summer. I get out, hit it (25-40 miles), load up quickly, and home to the A/C!

[smelonas]

Yessir. Texas is under the torch right now.

You just gotta get up earlier! That's what we do here in Arizona. I like to be on the trail by 6am at the latest during the summer. I get out, hit it (25-40 miles), load up quickly, and home to the A/C!

I'm from Vegas. I know how it doesn't cool down at night, and riding really is not fun during summer. It actually cools down here at night, usually 70s, sometimes 60s. But the drive is long and the snakes are prolific out here. Bag of excuses, I know, but summer is when I get my maintenence/tear downs and house stuff done. I stay plenty busy, don't worry. Always have an excuse to work and not ride!!

[Chuck78]

Have you actually tried a RAD valve? They do quite well. I would much rather have aluminum than a block of plastic as my reed cage.

[smelonas]

Have you actually tried a RAD valve? They do quite well. I would much rather have aluminum than a block of plastic as my reed cage.

It's a quality piece, but it's quite obvious that the intake manifold is a choke point compared to the OEM tract. Would need quite a bit of porting to open the throat up to match OEM.

I havent ridden it yet, but I've developed an occasional bog in the mid range that I gave up trying to fix for the time being. I have one on my CR125 and that thing rips.

Plus I like trying new stuff and I have broken stuff I need to replace, so why not mess around. You won't find out trying what everyone else has already tried.

[Chuck78]

Have you actually tried a RAD valve? They do quite well. I would much rather have aluminum than a block of plastic as my reed cage.

It's a quality piece, but it's quite obvious that the intake manifold is a choke point compared to the OEM tract. Would need quite a bit of porting to open the throat up to match OEM.

I havent ridden it yet, but I've developed an occasional bog in the mid range that I gave up trying to fix for the time being. I have one on my CR125 and that thing rips.

Plus I like trying new stuff and I have broken stuff I need to replace, so why not mess around. You won't find out trying what everyone else has already tried.

Did you ever try out the VForce4? Or the RAD Valve? I have a RAD Valve and a VForce3 and an OEM intake and reed block with Boyesens. The RAD Valve was specifically designed and ported for the KDX to optimize air velocity, it's not that it restricts the airflow, it just directs the airflow velocity in a way that it opens the read petals more. They definitely behave slightly differently than the VForce3, but that's not necessarily a bad thing. Due to the differences in my three engines, I couldn't tell you exactly an apples to apples comparison without trying them all on the same engine back to back, but I do definitely like the RAD Valve, & am picking up another one, but also likely to try a VForce4 at some point.

[SpruceItUp]

I have RAD valve on my CR125 and it works great. It has quite the quality feel to it, especially because it is made of aluminum and not plastic like the VF3 on my KDX.
Performance wise I have no clue as they're on two different bikes, but I may pick up a RAD valve for my KDX. It is a really well built product. And the fact that the intake manifold is all aluminum and the boot on it is easy to find makes it worth it. The reason I have one on my 125 is because the OEM manifold was dryrotted and causing an air leak, and a new intake manifold was just as much as the RAD valve.
...And honestly, I'm not skilled enough on the bike to take advantage of any extra power it may provide (at least up top) hahaha, so the difference to me is moot unless one of them makes noticeably more low end torque than the other. But I don't know the nitty gritty of which may make more power and HOW it makes that power.

Chuck, you say the RAD valve behaves differently than the VF3, in what way does it do so that makes you like it?
Thanks

[Chuck78]

I have RAD valve on my CR125 and it works great. It has quite the quality feel to it, especially because it is made of aluminum and not plastic like the VF3 on my KDX.
Performance wise I have no clue as they're on two different bikes, but I may pick up a RAD valve for my KDX. It is a really well built product. And the fact that the intake manifold is all aluminum and the boot on it is easy to find makes it worth it.


Chuck, you say the RAD valve behaves differently than the VF3, in what way does it do so that makes you like it?
Thanks

The RAD Valve is obviously the better design/build quality, with a generically replaceable coupling to connect the carburetor, instead of the OEM molded intake manifold boot.
The VForce has a quicker throttle response on the low end, but the RAD Valve has power gains everywhere else that the VForce3 does, and seems to smooth out the hit when the power valve opens a bit better, although this could be due to differences in atomization through the higher velocity through it.


Apparently the rad valve with the upgraded carbon fiber reads response on the low end exactly the same as the V-Force3.

The RAD Valve's reed placement angle is a bit greater, causing the reeds to have to bend further, although durability of the reeds seems to be a non-issue. The VForce3 places the reeds at a more relaxed angle so that they do not have to open as far, and they have a larger reed area.
There have been a few complaints of people saying that the plastic VForce reed cages are able to be easily distorted and sometimes show up new from the factory with a slight distortion so that the reeds do not seem to seat fully closed on them.

I'm very likely picking up another RAD Valve from a member here, but also would like to pick up a new Moto Tassinari VForce4 reed cage to compare and try out.

In the past, it seems the VForce3 performance has been preferred in the KDX community, but with the carbon fiber reed petal upgrade, perhaps this was a non-issue.