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Message: [QUOTE="KevinB4stk, post: 145548, member: 19093"] This is a great thread if you like XR400's or are planning on doing some mod's to your XR400. I am running a 415cc JE 10.5 piston, an HRC cam , heavier valve prings, stainless intake valves, slightly ported head, stock carb(62 pilot,168 main A16A needle), W.B. air filter, W.B. E- series exhaust with headers. This engine excelerates very hard and you can still rev it. With very broad power this bike is easy to ride with minimal clutch work. We tried the 406 kit first but the 415 is quite a bit better. It's hard to imagine such a little increase in displacement can make such an improvment. I also had a 96 XR250 with a 280 kit, a great investment for this bike realy wakes it up. I traded that bike for an 00 XR650r, I like power, I like heavy bikes, I guess that makes me nutts? As for dumping money into an XR400, I'm probably the worst guy on the DRN as far as that goes. Kevin [/QUOTE]