Asking for Dyno results is much like asking how much money someone makes. They'll tell you the amount they made for the week they worked all that overtime. Actual Dyno results are always less, sometimes much less. When you read that a particular bike hit some rather high HP figure, remember that this was probably the highest number achieved over a whole series of tests and was probably the shining example among a rather large number of like machines. Add to that a few HP to just make it sound better and a couple more to round up to the nearest even number.
Itís also rather easy to deliberately enhance the actual Dyno readings. An all gear run and a little creative shifting technique can be counted on for five or even ten more HP. I did a Dyno test on one of those Orange County Choppers a while ago and the 4th gear pull netted 107HP. The owner was really disappointed, so I suggested an all gear run with some slow shifting. He agreed and we scored 145HP. Needless to say, he threw away the 'real' test report and framed the 145. When a slow shift is made, the computer follows the resulting spike and the higher the over-rev, the higher the HP average score. Some guys want the 'real' numbers but most only want the highest number. I've even had a few ask for blank sheets so they could 'hand score' their own.