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Old 07-06-2009, 08:12 PM   #42 (permalink)
theycallmeebryan
Master EcoModder
 
Join Date: May 2009
Location: New Jersey
Posts: 389

2003 Ninja EX250 - '03 Kawasaki Ninja EX250
90 day: 78.57 mpg (US)

Saturn - '99 Saturn SL1 Base
90 day: 47.27 mpg (US)
Thanks: 25
Thanked 58 Times in 37 Posts
Quote:
Originally Posted by derangedhermit View Post
Good point. tcmb has 14 and 15 fronts, and 45 and 39 rears. He has tried:
45/14=3.21
45/15=3.00
39/15=2.60

He could try:
39/14=2.79
for free, getting back a little torque, at an unknown cost (if any) in mpg.

A front sprocket is $10-$15. If a 16T will fit on the bike, he can try 39/16=2.44. Since he is rarely going over 1/2 throttle with 2.60, there's a good chance he will find it OK.
The main reason i went with a 2.60 final drive is because most of my driving is on the highway. With the 2.60, the bike almost bogs from a stop going into first gear. I have to release the clutch a little slower than usual. Cruising on the highway, it feels like the bare minimum gearing (trust me, its a drastic reduction in acceleration from stock) but just enough. Anything lower would be detrimental. Also, on this bike 16t front sprockets require grinding modification to the housing for it to fit. 2.60 feels just right for my purpose.
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My 101.5 MPG 2003 Kawasaki Ninja 250




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