my friend, a track bike transmission setup is simple:
it should develop all rpm in 6th gear at the end of the longest straigth.
from this point, you only go to longer ratios.
only one IF: if there are a few bends or turns where a lower (3rd, 4th or 5th) gear becomes to short and you want a longer gearing just for those. (normally you dont want to do "in the corner shifting")
going longer will not help the first sentence, but will probably end in better lap time.
this is trial & error approach, and only real life testing gives you the answer...
if you are doing very fine tunning, even the wind direction and strength could modify the gearing...
When my bike was stock or had just a flash, I found the 18x44 was perfect for the tracks near me. With Supercharger Stage 2 gears I run the H2R gearing of 18x42.
You really want to work 2nd and 3rd gear at most corners in the 40-90mph range depending on your comfort level at the circuit. 3rd and 4th gear take good care of the tires with 18x42 gearing.
I wouldn't bother with a 19 front sprocket. That pretty much kills your drive everywhere. Stick with 18x42 and 18x44. Kawasaki hit it spot on.
I speak from experience. My bike has about 2,400 miles and about 1,700 of them are track miles.
My last tip would be to not bother revving out to 13k+ rpm. Shift around 12.5k and gear for that rpm range. Use the overrev (13k+) for long sweepers where you can't be bothered for shifting for fear of upsetting the chassis in the 'perky' part of the powerband.
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