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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
rad valve?
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[QUOTE="Sage, post: 101785, member: 22484"] Alrighty then, I'll break this down to give you a better view of my opinion. I started with a stock 99 220, added the pipe (FMF rev w/ powercore s/a) and tossed the airbox lid, that worked good. then pulled the cylinder to port it and raise the compression, that also worked well but still would'nt rev. then came across a 38mm PWK, WOW!, that really brought the bike to life but lost some bottom end........ bought a Boyesen Rad valve and it added almost all the bottom end that was lost by going to a 38mm carb, smoothed the powerband out and added over-rev. it was such a difference that people that had ridden my bike prior to the rad valve and then after the rad valve could'nt belive the difference, I sold four rad valve's that week! As for the rb carb mod, that also rocks! I added a divider plate after the rad valve and what I ended up with when done was a awsome engine package, more low end, big mid power & as much over rev as a 125, there's more in the engine that I can't say because I still need to make a living doing this, but if you read all the posts you might be able to pull enough info to built a clone? I think that most if not all the bad press that these valves get is the fact that most people don't rejet to compensate for the higher intake speed, the bike goes rich, power drops and the valve gets blamed? or the bike that is getting the valve had a good design stock and a boost is not felt very much? or both? I've used these on KDX's, KX's, RMX's, YZ's & a older CR with great results on all bikes. thats my opinion on the product and why I feel the way I do, sorry so long. :) [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
rad valve?
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