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V-Force.... Do they make a difference?

By lftdjeep426,
in Yamaha 2 Stroke

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lftdjeep426

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I'm Coming Back To A 2-STROKE!!!!

Been a while.... like 15 years! (Between not riding and then going to a 4-stroke)

I'm looking into a 2007 YZ250 and like normal, checking out hop-ups before I even have the bike.

How much difference dot he V-Force Reeds make over stock? Is there tunability?

The Bike is a fellow racer's and has a Gnarly pipe on it already.....

Recomendations?

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racerjon777

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For me, on a 125, it woke the bottom up. Of course I had port work done at the time of install, so I couldnt tell if the VForce did anything by itself. Granted, it wasnt heavy port work, but still port work none-the-less.

For 300 bucks there are better mods to do, and it all depends on where you're riding. If you're doing woods/offroad, Id stick to the stock setup. It moved the powerband around for me, really coming on strong up top with a nice smooth bottom/mid pull. Im running a 50t rear sprocket as well, so the extra over-rev it has is nice. I used to run it with a PC Platinum, but I have since put the stock pipe back on in favor of a smoother powerband.

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RCannon

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Examples?

Head mod...60-100 makes a huge difference. Single rind-racers choice piston..150.00.

Actually, its difficult to find a product that costs 150.00 that does not out-perform the v force, including graphics, since some graphics have gripper material.

The V force? On some bikes it may help. Thats stops a person from saying "it sucks" as few of us get to try it in every available application.

Jetting differences and worn reeds may account for improvements in some situations. Still, I believe it is a product marketed in hype. Once something gets talked about so often, no one wants to be the guy who says it did nothing since doing so may make the person look foolish.

Remember back when these engines were developed...lets say the mid 90's. The 125 and 250 two strokes were cutting edge products. Its doubtful some factory would develop a new engine design and forget to take a look at the reed valve assembly.

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BRM

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Its doubtful some factory would develop a new engine design and forget to take a look at the reed valve assembly.

Interesting you saying that Roland as ktm continue to develop their 2T range they install the V-farce reed valve sytem as standard equipment.

Performance wise I tend to agree they do not make night and day difference in power but in conjunction with other mods can show an improvement over stock. Over priced.... definately, should be around the 50-75 dollar mark.

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RCannon

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Interesting you saying that Roland as ktm continue to develop their 2T range they install the V-farce reed valve sytem as standard equipment.

Performance wise I tend to agree they do not make night and day difference in power but in conjunction with other mods can show an improvement over stock. Over priced.... definately, should be around the 50-75 dollar mark.

I noticed KTM doing that as well. KTM is also using the new version 4 this year. So, if 3 was so good, why a new version 4 at a time when two strokes really are not happening? Remember when the factories ran two strokes, the last year showed many teams using the v force. I believe it can be worked with where it does not hurt anything. The plastic, snap together construction is cool. Plus, I bet its a big deal for a manufacturer to stock one set of replacement reeds.

I felt like is did smooth the low end on yz 250. That could be good, I suppose.

Like you said, at 75. cents....I mean bucks....yea, why not. At 150 though.....Even pipes. We've all tried a bunch of them by now. A 200.00 pipe might be better than stock in ways, worse in others, but it does do something. I felt like the v force did not do enough to feel one way or the other.

Plus, if you look at their newest v force 4, it changes a things they sold us as benefits to their system 2 and 3. Boyesen has stuck with refining their original design and that makes me believe there was science behind theirs.

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Falcon991

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I had a V Force 2 on an old YZ125, and I barely noticed it. It helped clean up the transition off idle when you first wick on the throttle. With other mods, it helps... my '01 Yz that had the righteous motor went from "Bark" to "Aark" with the reeds. Just that sound alone may have been worth it!

PS- congrats on joining the counter-revolution!

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shagger

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Examples?

Slightly retard the timing. Free

Head mod.

RB carb mod = throttle control and more total flow.

Intake spacer = a bit of low end power.

8 (maybe a 9 with intake spacer) slide = Carburation you'll never get with jetting and needles alone.

DEP pipe is about the only all around (slightly) better pipe. Though others can taylor the bike to your riding style.

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roostierooster855

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v forces suck, stock i think is the best i actually bought a stock red cage off ebay for my 06 yz125, v forces are plastic and dont seal, boysen i couldent tell you but they probably dont make much of a difference any way, if any thing send you head to rb designs, ktm uses v force but there whole motor is designed to work with theme..... i also think my jetting is better with stock

http://www.rb-designs.com/

and he will recut your head, then jet you bike properly, they get the suspension done, trying to get more power out of the bike wont make you faster, trust me, you will probably have to much power making you slower cause it will be harder to control, im hope RCannon will cherp in more about the head and rb designs

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Budlite

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You can spend a lot of money on aftermarket parts, head mods, etc, etc but it won't run like an EG300. My advice is to ride it as it is until it needs a piston then spring for the 300. Buy a pipe only when you ruin the stocker and it can't be fixed. If the mx version of the 300 is not enough for you go buy a CR or KX 500AF.

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RCannon

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Do you guys remember that magazine, from 07, MX Illustrated? They tested a 2005 kx 250 with and without the v force. HP was within 1/2 horse, plus or minus, throughout the range. Basically, nothing outside of normal variance. The article did claim better throttle response, but whos to say. As far as power, the nod went to the stock reed block as it was a little stronger at peak. Actually, heres one better. A TT post summarizin https://www.thumpertalk.com/forum/archive/index.php/t-954920.html

Notice, they goofed up and never mentioned the v force hp (with stock engine) but it was virtually identical +or - 1/2 hp.

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usernamemx

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I say plastic snap together s##t is for model cars not engines.To me it sounds gimmicky,but ive never tried one either.The only reed cage i have tried is the boyesen rad valve.I chose it because i believed in evynd boyesen and because it came with a new intake boot.The bike was a 97 yz 125, to me it felt like it made the bike scream on top end w a bit of extra power.

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