- May 17, 2003
I have a '95 200H1 KDX that was purchased with a -30 rev pipe. Bike is equipped as follows: Ram valve, stock carb (re-jetted), turbine core 1 SA, air box cover removed, 91 octane pump gas, mxt2 @ 40:1, test rides at 2600'. The -30 had tons of power everywhere with a top end that would rev to the moon. It encouraged me to ride it like a 125 motocrosser. There is also a hit in the midrange which I smoothed out to a large degree though jetting. The pipe is great if you plan on riding the bike mostly on the mid to top end. It does work ok on the bottom, but that's not its optimal range. I purchased a Fredette Torque Ring to see how the pipe would react. It seemed to lose about 200-300 rpms on top with maybe dropping the power curve about that same amount (200-300 rpms). The change is extremely subtle. The main difference was the sound. It seemed to deepen to tone of the exhaust and produced a more 250 like sound. The suprise came when I installed the -35 pipe! I expected a major difference in power characteristics, but the change was not nearly as much as I expected. The pipe went on a perfect fit and required about 2 main jet sizes smaller. It seems just barely richer on the bottom with the same pilot and needle positions that I have been running. This pipe has power everywhere like the -30, but without the hit. It seems a little stronger on the bottom to mid range and not much of a loss on the top end. It will rev at least as far as the -30 with the torque ring. In a drag race with my son on his '97 XR250, the -30 with torque ring was close to a dead heat as far as top speed goes (I blow him away in the acceleration department). He would just barely pull ahead over a 1/2 mile at WOT. With the -35 pipe (no torque ring) I would walk away from him over the same distance. The main thing I noticed at first with the -35 is that it seemed to have a very slight resistance to rev past the point where the KIPS would open (very subtle). I went up a size on the main jet and that pretty much cured that tendency. I'm Very happy with the -35 (woods) pipe and that will be my main pipe I'll be using for foreseeable future.