Not entirely true... Same type of dyno(ie. Dynojet 250i), results should be very close IF the same correction factor is used and the operators use similar procedures. By proper procedures I mean if repeated runs are made till factors are equalized. Sometimes it might take 4-8 runs before results repeat. Tire temps, chain temps, engine temps, etc... Example...my runs in Mich. or Tenn. can easily be duplicated by Burned(Eddie) in Colorado with an equal bike with similar procedures. That is the advantage of the DynoJet. A post earlier about modifying the silencer on a 150R showed different graphs numbered consecutively...not very accurate at all. By repeating runs till the graph repeats itself, it eliminates many of the variables. The Dyno can be a very useful tool if used properly Tdub Gimme a break. This response was somewhat egotistical, and entirely unrealistic. So when Ron builds my motor can I expect to get the exact same HP as you! ??????? Better make sure you use the same tire, chain, and all other rotating parts have identical frictional losses. Rotational mass, wheel bearing and seals, chain friction, brake pad drag, all contribute too, as does strapping the suspension down too tight, tire pressure etc. Things the correction factor does not make up for. Where there is not written standard. How often do you think the procedures are duplicated by the same dyno operator? Let alone 2 mikaniks! I been around the dyno room with my drag bikes long enough to have more than just a clue whats going on. To tell the public, and people who don't know better that dyno charts can be duplicated from bike to bike (... which is what this topic started out as) and dyno to dyno.... ...well thats just unrealistic, among other things. I don't come here for pissy matches, nor to be dumbed down. How bout we all leave our ego's in our pockets.