Kami, a rider's weight will definitely play a factor in quarter mile times. There have been tests done and research made on this subject. One of the mags did a test years ago where they strapped weight to the bike in increments and found out what effect that caused. It is pretty safe to say that for every 25 pounds added, for a bike in that power range, that you can see a tenth of a second hit. So, out of the get you give up close to 4 tenths of a second to a 150 pound rider.
I have never launched a Hayabusa, but the key to the game when it comes to racing bikes is to find that thin line between power, traction, wheelies and bogs. This is done through precise throttle manipulation and clutch use. Now, from what I hear from friends who ride these bikes is that the Hayabusa likes lower rpm launches.... or more a streetlight style launch. This I couldn't tell you without riding one personally, but I am sure tons of guys on here could say otherwise.
There are really two numbers that dragracers need to be concerned with on their timeslips. If these two are done right, then the rest will fall naturally fall into place. The 60 foot time is the most important time on your slip, but even that will do you little good without a solid 330' time as well. I had my ZX-9 set-up before where it would 60 footer like a mother but bog a bit and lose some of the momemtum gained after the 60 foot mark. The key is to get to the 60' clocks quickly and to carry that momentum on down the track. It is often said that whatever you can gain to 60 feet in time, you can double by the finish line.... it seems to be pretty true from what I have seen.
I wouldn't be so concerned with the mph yet, that should increase as your times do and as the bike breaks in. Also, you didn't say, but things like altitude, hot weather, headwinds, etc. all play factors in a bikes mph. I hope this helps....
Kevin -
fastzx9@dragbike.com
