Here's another thread worth looking at... Which to run Long rod or Shortremember the difference is small check here, http://www.r-central.net/trx250rforums/ind...?showtopic=3894
I ran all the numbers for 90 degrees of crankshaft rotation and the rod angle it generates. Check my math, let me know if there are any errors.
Honda chose to use the short rod in the CR, which is good enough for me. But each rod has it's +/-
For those familiar with MacDizzy, he recommends the long rod for flat tracks, TT stuff, and motocross. He likes the short rod for straight line stuff and dunes. He also notes that the spacer plate you have to use with the long rod and 86 style piston increases the case volume, mellowing things out.