24 replies to this topic
  • bradgross71

Posted October 25, 2015 - 11:15 AM


Btw, after I installed a aftermarket exhaust, bike was popping in deceleration, so I used this map and the decel-pop was gone. attachicon.gifImageUploadedByThumper Talk1445610699.630979.jpg

my experience is go the other way with the fuel. I think the 14 was super fat and was a dog down low. Started taking fuel from lower rpm and throttle opening and the bike is night and day stronger.

  • Costa Rican YZ450F

Posted November 11, 2015 - 12:40 PM


Hey guys I have a question MXA suggest advancing the time to get more out of your bike, now if you were to add a full exhaust you would keep the timing advanced and just play with the fuel? Thanks in advance

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  • grayracer513

Posted November 11, 2015 - 03:07 PM


Be methodical.  Set one parameter, note the results.  Change the other, note the results. Then change the first one back, and so on.  Only by making one change at a time will you be able to learn what each change does.  As you develop a better feel for cause and effect, you'll be able to make multiple changes at once and get reasonably close to the results you want. 

  • rob298mx

Posted November 12, 2015 - 07:28 PM


I ran the above map which ironically is close to the map gytr recommends for hard hit stock exhaust. I like it better, has some more pull off the bottom and keeps making power like a 450 should. Stock map felt lazy to me, this certainly helped. I may opt for a 49T rear to close the gap between 2nd and 3rd.

I live in New England, almout sea level
I race Mx.
Bike is completely stock

  • dj78

Posted November 16, 2015 - 12:40 AM


2016 450f

Fuel all 0



+2 +3 +3

+2 +3 +3

+2 +2 +2


Easy to roll out of corners and fast enough for Pro´s.

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