New WR450 or YZ450FX?

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.

Are the transmission ratios all the same for the WR and FX? I was expecting the WR to have lower first and second gears.

Are the transmission ratios all the same for the WR and FX? I was expecting the WR to have lower first and second gears.

Same. It's the YZ that differs.

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