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November 20th, 2012, 11:51 AM
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#1 |
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time is running out....
Name: jesse
Location: the land of corn
Join Date: Sep 2012 Motorcycle(s): pregen ninjari Posts: 412
Blog Entries: 3
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back firing
harro.
i have an 04 250 with a jet kit, full areap exhaust and pods. a few months ago we jetted it and it ran perfect, jus fine. now that its a few months later...when backing off from very high revs like 10k-11k it will pop. .. is my bike leaning out? how so? nothign changed and we had it running right. weather change? its super nice out and warm...we jetted when it was cold. im not well educated how temp/weather effect air/fuel yet.
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The King |
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November 20th, 2012, 02:39 PM
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#5 | |
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Daily Ninjette rider
Name: Hernan
Location: Florida
Join Date: Mar 2011 Motorcycle(s): 2007 Ninja 250 Posts: A lot.
MOTY - 2016, MOTM - Dec '12, Jan '14, Jan '15, May '16
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Quote:
I agree with Lychee. For a recipient of one cubic feet, you will have more molecules of cold air than molecules of warm air. Since your cylinder stroke is a fixed volume, it will suck more molecules of cold air and less molecules of warm air. Proper combustion requires an air:fuel ratio of 14.7:1 Not very exact, but just for simplification, we could say that 15 molecules of air need 1 molecule of fuel to burn correctly at top temperature. So, how do you need to adjust the flow of fuel for cold and warm air? 
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Motofool  .................................Never ride faster than your guardian angel can fly "Mankind is composed of two sorts of men — those who love and create, and those who hate and destroy. Love is the bond between men, the way to teach and the center of the world." - José Martí |
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November 20th, 2012, 03:12 PM
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#6 | |
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sail away
Name: Jon
Location: San Jose
Join Date: Jul 2012 Motorcycle(s): gixxer (sold), ninjette (upgrade!) Posts: 964
Blog Entries: 8
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Quote:
 I know! I know! Raise needle (richen) for cold, lower needle (lean out) for warm.. . . Right? |
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November 20th, 2012, 06:32 PM
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#7 | |
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Daily Ninjette rider
Name: Hernan
Location: Florida
Join Date: Mar 2011 Motorcycle(s): 2007 Ninja 250 Posts: A lot.
MOTY - 2016, MOTM - Dec '12, Jan '14, Jan '15, May '16
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Quote:
You can also play with the size of the jets, the regulating screws and the level of fuel inside the bowls,..........or the electronic software of e-fuel injection. That was all, not difficult at all. Now rabies is well educated on how temp/weather effect air/fuel. 
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Motofool .................................Never ride faster than your guardian angel can fly "Mankind is composed of two sorts of men — those who love and create, and those who hate and destroy. Love is the bond between men, the way to teach and the center of the world." - José Martí |
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November 20th, 2012, 06:37 PM
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#8 |
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Nerd
Name: Chris
Location: Tujunga
Join Date: Mar 2012 Motorcycle(s): Ducati Hyperstrada Posts: 672
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BAM.
Get educated!
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It doesn't LOOK that steep. But you can go first... |
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November 23rd, 2012, 04:02 PM
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#10 |
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ninjette.org member
Name: Tim
Location: Quad Cities
Join Date: Sep 2012 Motorcycle(s): Ninja 250 Posts: 102
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We put #42 pilot jets in and #112.4 main jets and backed the idle screw 2.5 turns from bottomed out. I have mine adjusted the same with Uni pods and gutted stock pipes and it feels just a tad rich on mine. His ran just fine before. It hasn't been too much colder now than a month ago.
When my exhaust flange came loose, it backfired when I let off the throttle. Assuming it's all solid...I'm not sure.
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Motorcycle noob, feel free to ignore me. |
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