Big Bore Kit for 2010-13 YZ450's


6 replies to this topic
  • WYO522

Posted February 28, 2014 - 09:38 AM

#1

Looking for anyone who has run a big bore kit on thier 2010-13 450. Any issues? What, if any, changes needed to be made to the fuel/ignition mapping? ETC... I am looking at either the Athena 467 or 497 kits and just want some feedback before pulling the trigger. Any info would be much appriciated!



  • WYO522

Posted March 04, 2014 - 01:25 PM

#2

Decided against the big bore kit and purchased a GYTR Head and GYTR Hi Comp piston  :cool:


Edited by proclimber522, March 04, 2014 - 01:26 PM.


  • michael quagliaroli

Posted March 09, 2014 - 06:42 PM

#3

Unless your a A level rider or pro you will not benefit from a big bore kit on a 450. 450s make plenty of power. Look at gearing changes to customize your power delivery for your riding. Anyone else have any thoughts.

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  • Mtrain730

Posted March 10, 2014 - 03:09 PM

#4

Maybe he doesn't race mx and just wants too hold it pinned through a field or up the side of a mountain what ever puts a smile on that's the point right. :)

Edited by Mtrain730, March 10, 2014 - 03:12 PM.


  • WYO522

Posted March 17, 2014 - 10:51 AM

#5

Unless your a A level rider or pro you will not benefit from a big bore kit on a 450. 450s make plenty of power. Look at gearing changes to customize your power delivery for your riding. Anyone else have any thoughts.

 

 

I am an A level rider. I am also a professional hillclimber. A stock 450 is vastly under powered in 450 ProMod, 0-600 and 0-700 pro classes. I didnt ask for your opinion on how powerful 450's are. Please keep them to yourself.



  • WYO522

Posted March 17, 2014 - 11:00 AM

#6

I finally put the GYTR head and piston on! Mapped according to GYTR's recomendations and WOW! The bike kept most of its low end bark, which I like. It now revs out much higher. From mid range on up it pulls much harder. I am going to try a map that is some what a cross between the Jay Marmont map, and the GYTR. If anyone cares I will keep updated on how the bike preforms.



  • michael quagliaroli

Posted March 24, 2014 - 05:11 PM

#7

Wow you sound like a real pleasant guy to be around.





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