Two Stroke Motocross
Two Stroke Motocross Forum => Technical => Topic started by: joel95 on April 07, 2012, 10:02:40 AM
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So decided its time for a new reed block for my 2007 cr125, just cant decide on what would be the better choice? I have heard that the boyesen is a better reed block if you can jet it to suit, but the v-force doesnt need much of jetting change.
What do you guys use? 
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I use the v-force on my 2002 honda cr125 along with the pc works pipe and 304 factory sound long silencer I have crisp throttle responce it broadens power from bottom to top I jet the carb for what the track conditions are what the outside temp is and altitude sometimes I'll even go 1 leaner on pilot and main and put the clip on the needle in the 3rd position air screw adjustment depends on track/temp/altitude of where you are also have 52t rear sprocket. I've never used the Boysen Rad valve so I couldn't tell you but with the v-force you just jet the carb like you normaly would.
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I use boysen on my 250. I don't think I can really compare that to a 125 though. But my jetting stayed the same running the boysen reeds (again not sure if that would change for your 125). They added a ton of low end and added some high end power for my 250. That they should do for your 125.
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I can't speak for the Vforce, but my RAD Valve gave a noticeable low end increase and throttle response, coupled with a shorty silencer and a 51-tooth rear it shoots out of turns! Bike's an '01 RM125
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cant decide on what would be the better choice
Both are very good. I prefer the VForce on 250 and 500s and the
Rad Valve on 125s. The Rad Valve's design actually boost power
a bit on the tiddler along with the better throttle response that
both provide.
dogger
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I have tried both reed blocks,my 06 cr125 has a rad valve,icat,stock pipe,pc reg. silencer, the silencer makes a tiny improvment,on a 04 there,s a big difference. The rad valve has much better throttle response, low to mid improvment is huge, threw the midrange there,s a little improvment, topend a tiny improvment. The 06 runs alot better with the r.v., with stock gearing and 170 lb plus rider, it pulls hard enough that I want to drop a sproket tooth, much leaner jetting required, the 05-07 is already very rich all stock. Pull the reeds on the r.v. and polish the inside smooth,before ya install it. I installed the vforce on my 04 cr125 when new, throttle response is better than stock, slight midrange and topend improvment, the icat made a bigger improvment in throttle response and midrange. If your cylinder is stock get the rad valve,with the low to mid boost, it,s impossible to ever fall off the pipe. If your cylinder is ported for mid to topend, the vforce, has good dyno #,s on the topend they say. With the radvalve you want to drop a tooth, from the added boost, less shifting, let the mid pull longer.With the vforce you don,t think about dropping a tooth, because the improvment is slight.
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I have always used the V-Force Reeds/cage on my bikes. They come stock on KTM and Husky for a reason!
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I put a vforce 3 on my 98 kx250 and it worked very well for me , the bike was crazy fast .
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I run a Vforce on my 07 KX250 awesome improvement everywhere over stock
but from everything I've ever read or heard, the Rad Valve is the way to go for a CR125. Major improvements everywhere especially if you're running the FMF fatty and powercore2, re jetting is almost always required, but can be obtained through FMF website that works spot on with the RV at sealevel
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I'm with you lukeduke KTM and Husky wouldn't be putting the V-Force reeds on there bikes if they didn't work i been useing the V-Force for 8 years now with my 2002 Honda cr125 with good improvements over stock from bottom end to top end
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Not saying vforce don,t work any better than stock, but most riders don,t replace there reeds every 20 hours, like you should. Then they put a vforce cage on, and they think they have this big increase in power. If they had fresh stock reeds in, then installed the vforce cage they wouldn,t feel much of a difference. The vforce on new KTM and Husky,s that,s just a marketing ploy. When 2-strokes where raced at the nationals, no factory teams used them. They used the stock cage with carbon fiber reeds. The biggest thing is to keep your reeds fresh, if the ends are chipped back, or they don,t seal tight, your loosing performance. If you have a over sized carb on, reeds have a shorter life span, 20 hrs and the corners are chipped, but not all the reeds corners are chipped on the v force, that tells me the air flow is not equil on the reeds, other reeds do not seal tight. On sleds v force blows the whole inside out, on the cage into the engine, but there pushing alot more air. For the average rider, the rad valve is the best choice because of the big low to mid increase making it easier to keep it on the pipe,keeping the rider sharp to the checkers. Corner speed is much improved with the rv, I know of other riders that tested both cages on diff makes, and 125 and 250,s same result.
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LOLOL I need a break
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ktm-parts.com:delta force2 reed block
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ktm-parts.com V-Force delta2 reed block
read this super trucker and then try and say no teams used the v-force in the nationals
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Maybe the dyno imagined all that extra HP across the range I found by fitting a V Force. Petals will chip with low oil ratios the oil cushions the petal against the cage
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ktm-parts.com V-Force delta2 reed block
read this super trucker and then try and say no teams used the v-force in the nationals
In 2003 the last year 2-st where at the nationals in numbers, not what comes stock on a Ktm. Most riders are not top experts, they benefit from a reed valve that makes it easy to keep it on the pipe.The rv makes that possible with the low to mid boost. I know the vforce has a good topend # on the dyno,read my previous post,dynos do not ride the track tho. I used to race the expert class, current experts on 250,s tested both and chose the rv. TWOSTROKEMTOCROSS YZ144 had a rv, I thought every moto head knew about the low to mid boost with the rv. Really nothing to get upset over guys, I know I,m not. braap
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I think we've had this same discussion on at least 2-3 other threads, it's been pretty well beaten. My preference is the V-Force, tried both back to back on my 250, and the V-Force definitely makes it easier to hold 3rd gear through corners, with the stocker and the Boyesen, I had to downshift to 2nd to stay on the pipe without bogging. Much easier to clear jumps right out of turns with the V-Force.
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I think we've had this same discussion on at least 2-3 other threads, it's been pretty well beaten. My preference is the V-Force, tried both back to back on my 250, and the V-Force definitely makes it easier to hold 3rd gear through corners, with the stocker and the Boyesen, I had to downshift to 2nd to stay on the pipe without bogging. Much easier to clear jumps right out of turns with the V-Force.
This ^^ but for durability I like the Boyesen.
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And here's another, relatively easy, 'tuning' variable with 2ts - reeds / reed blocks.
A recent issue of Brit Mag, Moto X, with their long term RM250 (I think it sells for something near 1400 Pounds, less than a YZ250 , which costs more than the KTM250SX 
- when both the RM and YZ have been in a 'time warp, for years now - graphics, muffler and jetting changes, don't cut it for advances, over the RM, on the YZ), evaluated the V Force. The Brits sure get reamed on Yamaha prices - the new WR450 is more expensive than the new KTM 4ts - , much like we do here, in OZ, with KTM / Berg prices.
The tester / keeper of the bike, suggested that it would be useful to probably keep the V Force for sand tracks - loam tracks / good traction tracks, as it made the lower/ mid range power get to the level that on a hard pack track, it was better to keep the std reed block on. And the bloke was not a squid - I think, a very high level rider, especially in their very well organised 2t series.
Just a bit of food for thought.
I've only gone to Boyesen Reeds, on my 500 - something 'programed' into me from many years of riding / owning bikes. They are in perfect order, after 9 years use, and many thousands of Ks travelled.
I recently bought a Rad Valve, purely from the thought I may be changing the carb position, to accommodate an entirely new rear end on my bike. I can cut and re-weld the spigot, and the price I found, months ago, made it ridiculous to machine my own reed block up. Boyesen, seem to not list them , on their site, for my 500, anymore, as well, so they may be going the way of the Dinosaurs, soon.
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Im with super trucker. Stock block with carbon reeds
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I would also recommend Boysen Dual stage reeds, I put them in my old YZ and it really made a big difference in throttlew response through the whole spread. The reeds in it were good, I just replaced them because I had heard about the Boysens bein better.
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Iv had both though not on the same bike and both times I got the bike with them already fitted so iv not got much comparison but to me I don't think they make any difference and that theyr pretty much just like exhausts that while a power increase is probably there they just dont feel to make the bike any faster. In my opinion your better spending your money on maintainance or on track time as I feel that they are both a lot better at improving laptimes, have you got your suspension set up?