Jetting for yz450f - Drd Exhaust

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5/8/2018 1:35 PM
Edited Date/Time: 5/8/2018 1:37 PM

Hey everyone, I am new here but I have looked high and low for what to do with my bike. I just bought a full DRD ss exhaust (header and slip on) for my 2009 yz450f. I went on their website and it said a 162 main jet and a 45 pilot jet. I mainly ride in the summer so I want the bike to perform best at that time. from my understanding the stock jet size for an 09 yz450f is a 160mj and a 45 pilot jet. So, my question is, is their website right? do I need to rejet to begin with? and just some overall guidance with my build, as far as drive train the bike is stock.

Any input is greatly appreciated.


5/8/2018 2:09 PM

I never had to rejet when I used DRD exhaust.

Paw Paw


5/8/2018 2:22 PM

would I gain power if I were to rejet and put the exhaust on?


5/8/2018 2:41 PM

I had DrD on my 2009. No issues at all. Put it on and ride.


5/8/2018 11:22 PM

Give them a call or email and Doug can give you the correct info.