2012 EFI map question

7 replies to this topic

Posted March 26, 2012 - 05:17 PM


Are the maps for a 2012 the same as the 10,11

  • delmas

Posted March 28, 2012 - 04:56 PM



  • luvnoldcars

Posted March 28, 2012 - 05:19 PM


I don't understand how they are the same. Your starting from a different base setup.
Just asking

Edited by luvnoldcars, March 28, 2012 - 05:20 PM.

  • HRC

Posted March 29, 2012 - 03:57 AM


The 2012 has a different stock map compared to 2010,2011

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  • grayracer513

Posted March 29, 2012 - 08:35 AM



No. Not exactly. They can all be used, but....

All 3 years of EFI YZ450's have slightly different base maps. When you plug the tuner into any of them in their as-delivered state, they will all come up zeros on the screen, but that misses the point that they do vary from one to another. This means that if you do something like go +1 across the board on a 2012 and a 2010 or '11, they'll actually be mapped differently from each other by the amount that the base maps vary in each cell.


Posted May 07, 2012 - 03:23 PM


I know Yamaha states that each step on the fuel map is a 3% change, does anyone know what that relates to? Is 3% a half jet size a full jet size? Just curious since coming from 2-strokes...

  • grayracer513

Posted May 07, 2012 - 03:58 PM


As a reference, a #168 Keihin main jet is about a 3.6% increase over a 165.


Posted May 07, 2012 - 04:35 PM


Good to know, thank you!

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