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Old 09-30-2012, 08:22 PM   #1 (permalink)
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Default shooting for 80mpg

08 ninja with 180lb rider, zero gravity windshield, rear seat cowl, yoshi exhaust

ordering k&n air filter monday and considering 15t sprocket change
other suggustions?

also do i HAVE to replace the chain with sprocket?
12k on bike
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Old 09-30-2012, 09:35 PM   #2 (permalink)
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Dang!! 80 MPG is awesome!
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Old 09-30-2012, 09:36 PM   #3 (permalink)
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Wow. What type of riding do you do?
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Old 09-30-2012, 09:37 PM   #4 (permalink)
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i said shooting for, not that im there lol
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Old 09-30-2012, 09:44 PM   #5 (permalink)
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not sure if serious ...
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Old 09-30-2012, 09:56 PM   #6 (permalink)
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why wouldnt i be serious? i already get 65-70 b4 airfilter and sprocket change
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Old 09-30-2012, 11:37 PM   #7 (permalink)
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If you've got that many miles on your stock chain and sprocket you're definitely going to want to change both front, rear, and chain. They create a wear pattern when they run together, and putting a new sprocket, or just one sprocket and chain can screw up everything (including the new stuff).

And yeah 80 MPG isn't unreasonable if you're riding carefully and slowly.
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Old 09-30-2012, 11:58 PM   #8 (permalink)
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Quote:
Originally Posted by Wrider View Post
If you've got that many miles on your stock chain and sprocket you're definitely going to want to change both front, rear, and chain. They create a wear pattern when they run together, and putting a new sprocket, or just one sprocket and chain can screw up everything (including the new stuff).

And yeah 80 MPG isn't unreasonable if you're riding carefully and slowly.
thanks for the info

also, my exhuast is slighty hurting mpg correct? and a jet kit would help?
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Old 10-01-2012, 12:04 AM   #9 (permalink)
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Well what IS your exhaust? Yoshi makes both a full-exhaust and a slip-on. Regardless, re-jetting is only going to hurt your fuel economy. From the factory the main jet was spot on, but they needle was very conservative so most people raise them a bit to richen your mid-range band to make the bikes more responsive. So nothing you do via jetting is going to IMPROVE your fuel economy. A K&N air filter will gain you absolutely nothing (but they always include a shiny sticker which is thoughtful).

The only thing that will help you at all is like you mentioned with the re-sprocketing. Going to a 15/41 or even 15/39 will help. But then again running a 250r with incredibly lean jetting on the mid-range and a slip-on (because it won't hurt your fuel economy like a full-exhaust will) and taller gears is only going to make it good for getting great fuel economy. It'll be a total slug below 9,000 RPM or so (seriously) and it'll take forever to accelerate to freeway speeds.
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Old 10-01-2012, 12:07 AM   #10 (permalink)
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Quote:
Originally Posted by VeX View Post
Well what IS your exhaust? Yoshi makes both a full-exhaust and a slip-on. Regardless, re-jetting is only going to hurt your fuel economy. From the factory the main jet was spot on, but they needle was very conservative so most people raise them a bit to richen your mid-range band to make the bikes more responsive. So nothing you do via jetting is going to IMPROVE your fuel economy. A K&N air filter will gain you absolutely nothing (but they always include a shiny sticker which is thoughtful).

The only thing that will help you at all is like you mentioned with the re-sprocketing. Going to a 15/41 or even 15/39 will help. But then again running a 250r with incredibly lean jetting on the mid-range and a slip-on (because it won't hurt your fuel economy like a full-exhaust will) and taller gears is only going to make it good for getting great fuel economy. It'll be a total slug below 9,000 RPM or so (seriously) and it'll take forever to accelerate to freeway speeds.
The sticker will get him 4mpg

Which will hurt his mileage somewhat as well. The longer you have the throttle open to accelerate the worse your mileage is going to be. Not a big deal if you have long stretches of highway, but if you're riding in a more urban environment it will do more harm than good.
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