V-Force or Boyesen for YZ144?

MXEditor
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MXEditor
Edited Date/Time 4/16/2012 9:08am
Hello All,

Just want opinions on V-Force 3 vs. RAD Valves when applied to a 2001 YZ144 (w/2003 144 jug)

We have the older V-Force setup in there and liked it when it was a 125cc engine. Soon it will be a 144 done by KB5 Industries. My buddy had a KX250 with the RAD valve and he swore by it.

Thoughts?

TIA - Sean
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motox731tuner 4/15/2012 10:07am
4/15/2012 10:07am
Rad valve, more top end. The Boyessen X-wing for in the back of the carb helps to. We have ran both valves on our Yamahas but have never had the V-force 3 so that could be a factor.
Psc19933
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Psc19933 4/15/2012 10:29am
4/15/2012 10:29am
Rad valve is a great product. A lot of time you will need to jet DOWN some to gain the full effect of the rad valve.
pitbike502
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pitbike502 4/15/2012 11:03am
4/15/2012 11:03am
I had an 01 with both of them, not a 144 but same bike. I personally swear by MT, the performance is exceptional and really seems to be noticeable and useful in comparison to the RAD.

The X Wings and all the other similiar products never really seemed to produce solid results for me. IMO thats just a waste of $100.
mx5471
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mx5471 4/15/2012 1:29pm
4/15/2012 1:29pm Edited Date/Time 4/15/2012 1:41pm
We have an '06 YZ 125 with the Vforce valve on it. It was 144'd, but it blew after a while and we put it back to 125 because we had the parts. My son liked the performance of the Vforce over the Rad. I liked it also because the petals held up great. On the Rad they kept chipping away. That's why we switched to the Vforce,(or MT as 502 calls it. It's the name of the company that makes the Vforce, Moto Tassorrini I think it is). From my son's input, I would go with the Vforce. Never used the xwing things, but we bored the carb 1mm over, along with other things. He beat 250F's on that bike in the xpert class. It's a great bike. We're in the process of re-building it again.

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2T42
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2T42 4/15/2012 2:52pm
4/15/2012 2:52pm
mx5471 wrote:
We have an '06 YZ 125 with the Vforce valve on it. It was 144'd, but it blew after a while and we put it back...
We have an '06 YZ 125 with the Vforce valve on it. It was 144'd, but it blew after a while and we put it back to 125 because we had the parts. My son liked the performance of the Vforce over the Rad. I liked it also because the petals held up great. On the Rad they kept chipping away. That's why we switched to the Vforce,(or MT as 502 calls it. It's the name of the company that makes the Vforce, Moto Tassorrini I think it is). From my son's input, I would go with the Vforce. Never used the xwing things, but we bored the carb 1mm over, along with other things. He beat 250F's on that bike in the xpert class. It's a great bike. We're in the process of re-building it again.
Excellent. Thanks for the input. I plan to race my yz125 more this year and have already started ordering parts to get it ready.

We need videos of this 125 vs 250F action! Sounds like the kid is having fun.
bradmx421 4/15/2012 2:53pm
4/15/2012 2:53pm
V-Force without a doubt.....the Dyno Says SO.....

if you need one i can get one for you for $120 and i will ship it for FREE
IceMan446
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IceMan446 4/15/2012 3:33pm
4/15/2012 3:33pm
mx5471 wrote:
We have an '06 YZ 125 with the Vforce valve on it. It was 144'd, but it blew after a while and we put it back...
We have an '06 YZ 125 with the Vforce valve on it. It was 144'd, but it blew after a while and we put it back to 125 because we had the parts. My son liked the performance of the Vforce over the Rad. I liked it also because the petals held up great. On the Rad they kept chipping away. That's why we switched to the Vforce,(or MT as 502 calls it. It's the name of the company that makes the Vforce, Moto Tassorrini I think it is). From my son's input, I would go with the Vforce. Never used the xwing things, but we bored the carb 1mm over, along with other things. He beat 250F's on that bike in the xpert class. It's a great bike. We're in the process of re-building it again.
Who did the 144 kit for you guys?

I am thinking of doing that in the next year but wanted to get some input on who to go with.

I have read nothing but good things about the work Eric Gorr does.
roughneck
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roughneck 4/15/2012 3:44pm
4/15/2012 3:44pm
V-Vorce all the way

IceMan..Varner can dial your motor for you..Give Terry a call..
MXEditor
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MXEditor 4/15/2012 3:48pm
4/15/2012 3:48pm
mx5471 wrote:
We have an '06 YZ 125 with the Vforce valve on it. It was 144'd, but it blew after a while and we put it back...
We have an '06 YZ 125 with the Vforce valve on it. It was 144'd, but it blew after a while and we put it back to 125 because we had the parts. My son liked the performance of the Vforce over the Rad. I liked it also because the petals held up great. On the Rad they kept chipping away. That's why we switched to the Vforce,(or MT as 502 calls it. It's the name of the company that makes the Vforce, Moto Tassorrini I think it is). From my son's input, I would go with the Vforce. Never used the xwing things, but we bored the carb 1mm over, along with other things. He beat 250F's on that bike in the xpert class. It's a great bike. We're in the process of re-building it again.
Did you overbore the carb for the 144 setup?

What pipe/silencer is everyone running?

We'll have a FMF Factory Fatty and the Shorty Silencer.

Thank you FMF and KB5 Industries
MXEditor
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MXEditor 4/15/2012 3:48pm
4/15/2012 3:48pm
bradmx421 wrote:
V-Force without a doubt.....the Dyno Says SO..... if you need one i can get one for you for $120 and i will ship it for FREE...
V-Force without a doubt.....the Dyno Says SO.....

if you need one i can get one for you for $120 and i will ship it for FREE
Are dyno charts available?
bradmx421 4/15/2012 3:53pm
4/15/2012 3:53pm
bradmx421 wrote:
V-Force without a doubt.....the Dyno Says SO..... if you need one i can get one for you for $120 and i will ship it for FREE...
V-Force without a doubt.....the Dyno Says SO.....

if you need one i can get one for you for $120 and i will ship it for FREE
MXEditor wrote:
Are dyno charts available?
i dont have any v-force runs saved..... i do have the dyno chart for their new AIrFOrce Airboot system.......3.5hp bolt on stock kx250f... not that it helps you out any. but i can tell you the V-force is the way to go from my experience
1
mx5471
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mx5471 4/15/2012 5:08pm
4/15/2012 5:08pm
We started with a brand new '06 YZ125 in '07. We got it for $4000. We had help from a former factory mechanic. The carb was not bored for the 144. It was done while we ran it as a 125. We made 1 change each week, to see if it was better or worse. We 144'd it with an Athena kit which was junk, if you read another post regarding that on this board. Then we went back to stock 125 displacement for the rest of the season. The 144 Athena kit only lasted 5 or 6 races. It was a 30 race series. We ran a Pro-Circuit pipe with the 302 silencer. The shorty is not what you want for this application. We have had better results with Pro- Circuit than FMF. If you run the FMF, run your stock silencer with it. The thing of this is, that if you're racing against 250F's, you better know how to ride and be fast, and you will also be reaming the piss out of that bike, which makes it not last long. Also, we ran a head that had more water volume to help with cooling. Stock compression. We ran water in the system, with a splash of water pump lubricant, as it runs cooler than with anti-freeze. We constantly tested and changed the jetting for every change we made. We changed pistons and rings every week, and a lot of times I changed the ring in between moto's. Yamaha jugs are the best. I only had to change it once, rather than replating because of great deal from local dealer sponsorship. Always used stock pistons and rings. Bottom end on those bikes are like iron, as rock solid as it can be. But if you're racing against 250F's, you are gonna be working on that motor every week. It was a very hard season that year. The goal with our sponsors and us, was to see what it would take to run a 125 against 250F's. It doesn't work very well. We worked hard , he missed 4 or 5 races, and had a couple engine failures that caused him to not get any points. He won 1 race, but finished in top spots, that he won the class. Back then it was still called 125 Expert. Now they call it Lites. Anyway, if you're planning to race the bike competitivley , you are going to spend a lot of money and a lot of time. I think the biggest thing of it is, you have to know how to ride, and ride fast. Otherwise you have no chance. He blew the motor the next year while ridig at a friends track, and it's been sittin ever since as he he in college now and rides an RM250. But we pulled it out and it looks mint. I'm going to 144 it with Eric Gorr, and get her running again. Good luck.
viking24
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viking24 4/15/2012 5:53pm
4/15/2012 5:53pm
fFom my experience a less reving 144 would see improvements from the RAD system over the V-Force. V-F tend to favor high reving (expert / pro) applications. Everyday racer/riders will find improved torque and overall ridability from the Boyesen system. That is...of course only my findings.

Good Riding!
MXEditor
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MXEditor 4/16/2012 6:51am
4/16/2012 6:51am
Thanks for all the good advice here folks - it's really helpful
IceMan446
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IceMan446 4/16/2012 9:08am
4/16/2012 9:08am
mx5471 wrote:
We started with a brand new '06 YZ125 in '07. We got it for $4000. We had help from a former factory mechanic. The carb was...
We started with a brand new '06 YZ125 in '07. We got it for $4000. We had help from a former factory mechanic. The carb was not bored for the 144. It was done while we ran it as a 125. We made 1 change each week, to see if it was better or worse. We 144'd it with an Athena kit which was junk, if you read another post regarding that on this board. Then we went back to stock 125 displacement for the rest of the season. The 144 Athena kit only lasted 5 or 6 races. It was a 30 race series. We ran a Pro-Circuit pipe with the 302 silencer. The shorty is not what you want for this application. We have had better results with Pro- Circuit than FMF. If you run the FMF, run your stock silencer with it. The thing of this is, that if you're racing against 250F's, you better know how to ride and be fast, and you will also be reaming the piss out of that bike, which makes it not last long. Also, we ran a head that had more water volume to help with cooling. Stock compression. We ran water in the system, with a splash of water pump lubricant, as it runs cooler than with anti-freeze. We constantly tested and changed the jetting for every change we made. We changed pistons and rings every week, and a lot of times I changed the ring in between moto's. Yamaha jugs are the best. I only had to change it once, rather than replating because of great deal from local dealer sponsorship. Always used stock pistons and rings. Bottom end on those bikes are like iron, as rock solid as it can be. But if you're racing against 250F's, you are gonna be working on that motor every week. It was a very hard season that year. The goal with our sponsors and us, was to see what it would take to run a 125 against 250F's. It doesn't work very well. We worked hard , he missed 4 or 5 races, and had a couple engine failures that caused him to not get any points. He won 1 race, but finished in top spots, that he won the class. Back then it was still called 125 Expert. Now they call it Lites. Anyway, if you're planning to race the bike competitivley , you are going to spend a lot of money and a lot of time. I think the biggest thing of it is, you have to know how to ride, and ride fast. Otherwise you have no chance. He blew the motor the next year while ridig at a friends track, and it's been sittin ever since as he he in college now and rides an RM250. But we pulled it out and it looks mint. I'm going to 144 it with Eric Gorr, and get her running again. Good luck.
Keep us updated. Intrested on how it will turn out with Gorr doing the work.

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