minja 250 2010 mpg

[kawboyCAFE]

Originally Posted by Rick323

That's a pretty big gearing change....

on these bikes its not that big of change.

[kawboyCAFE]

Originally Posted by Rick323

If your bike is like my Versys the speedo/ odometer will be off

ninja 250 speedo is run off the front wheel.

[kawboyCAFE]

Originally Posted by Rick323

9100 rpm? Holy smokes-how fast are you going?

thats about what these bikes run stock at 70-75 mph.

[kawboyCAFE]

hey mpgking: i have a 2009 ninja 250 myself. i have changed the gears on mine also.
i have a 15 on the front and a 42 on the rear, both steel jtsprockets. get steel, because aluminum sprockets wont last long for everyday driving. my bike runs like it should now after the gearing change. the stock setup was too low geared. it has helped my fuel mileage and highway riding immensely. i now average mid to high 60s' in mpg, without even trying. i use to get worse because i was riding it hard, so my fuelly average will show high 50s'. if i was trying i could probably get close to 75-80. my new gearing has dropped my rpm alot at highway speed. a definant improvement. i think at an actual 70 mph i am running like 7000 rpm. the older ninja 250 ninjas got a little better mpg because they were cammed for better top end. the newer ninja 250s are cammed for better mid-range, so better real world power is at tap. i hope this helps.

i have a zero gravity sport touring windscreen also. you'll love it. probably the best mod
i have done yet. you might want to look at the roaring toys 1" handlebar riser blocks, and the 2" rear lowering links from pro-tech. together, they are the second best mod i have done.

[darcane]

Originally Posted by kawboyCAFE

...you might want to look at the roaring toys 1" handlebar riser blocks, and the 2" rear lowering links from pro-tech. together, they are the second best mod i have done.

Did you lower because you are ...inseam challenged? Or for aero? If the latter, was it enough to notice or just lost in the scatter?

[kawboyCAFE]

i actually lowered the bike because they had the tail too far up in the air, and i kept sliding forward into the gas tank. now it sets perfect, and i no longer feel like i am going to slide forward. i think it might have actually helped the aerodynamics a little, but i didnt really care about that at the time. i just wanted to stop sliding into the gas tank. plus, there is a little less stress on the wrists now, with the lower tail. not that there was much to begin with.

[Electictracer]

I had a 2008 and the speed and tach would read differntly compaired to each other, the lower the tempiture the lower the speed would read.

[jkv357]

Originally Posted by kawboyCAFE

i actually lowered the bike because they had the tail too far up in the air, and i kept sliding forward into the gas tank. now it sets perfect, and i no longer feel like i am going to slide forward. i think it might have actually helped the aerodynamics a little, but i didnt really care about that at the time. i just wanted to stop sliding into the gas tank. plus, there is a little less stress on the wrists now, with the lower tail. not that there was much to begin with.

You'd be better to modify the seat to reduce its forward slant rather than lowering just the rear. You are altering the cycle's geometry by just dropping the rear-end - generally not a great idea.


Jay

[sendler]

Gearing commander can help pick your gearing. Your speedo is probably way off. You need to verifiy it with gps or mileage signs. The tach may be off as well. It is on my Honda. I have an 09 Ninja250 with ZG sport touring screen and stock gearing. I can coax 66 mpg out of it at 65mph with some truck following. I get 87 mpg with my CBR250R on the same commute. Your best economy/ performance trade off should come from running your cruise speed at just below the first torque peak. So maybe 15/ 40 gearing for 6,600 rpm at 65mph. First gear will start to feel pretty long for smooth launches on hills though.
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Gearing Commander: Motorcycle Speed, RPM, Chain & Sprockets Calculator

[thomason2wheels]

Many thanks for posting up the torque and power curves. They explain what i have felt in the seat of the pants after my regearing my 09 ninja. I did something close to what others have done with 15 tooth front and 41 tooth rear which gives me 6k rpm at an indicated 62. I cant gear it much taller and have adequate torque for climbing hills at my size and weight. That engine is pretty gutless under 4 or 5k. It feels to me like this is the gearing it should have had from the factory.