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WYO522

Big Bore Kit for 2010-13 YZ450's

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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!

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

Edited by proclimber522

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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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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
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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.

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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.

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