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New WR450 or YZ450FX?

By Fryboy,
in WR400F/426F/450F

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Grand Master

MidlifeCrisisGuy

Posted
Posted

INTAKE

YES

YES

 

Changing the exhaust cam makes a bigger difference.  The engine flows better.  If you change just the intake cam, the engine is still plugged up on the exhaust side.

 

I'm surprised your bike didn't lose power changing just the intake cam.   The 2012-2015 WR heads are different than the YZ450F heads the intake cam was meant for.  That is probably why your swap didn't work better than it would have in a pre 2012 WR450F.

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BazookaJoe
BazookaJoe

Not true at all, check the part numbers.   The piston, head, cams, crankshaft, and flywheel are the same on the 2015 WR250F and YZ250FX.  In fact, the piston and head are the same between a YZF, WRF,

FORMA MOTO
FORMA MOTO

..wow, and I'm the dick, huh.   I did not mention you, call you names, or get upset........   I don't think I could have been any more neutral......   ...you seem to have JUST the temprame

OUTERLIMITS
OUTERLIMITS

Bottom line is you can make a WR run like an FX, but the FX will never be green sticker for us in Ca.  The WR's have more than enough power once all the ECU, throttle stop, snorkle, and exhaust mods a

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