Standard main jet on a 2007 WR450F?

What is the standard main jet on a 2007 WR450F?

Are they all the same for the bikes sold in the US?

Mine as a #162.

I bought the Moose Racing jet kit (Dynojet) and it recommend a #146????

From reading the forums it seems like most people uses a #170.

I have serious "backfire" when I decelerate. Any thoughts?

Thanks in advance!

Fred

What is the standard main jet on a 2007 WR450F?

Are they all the same for the bikes sold in the US?

Mine as a #162.

I bought the Moose Racing jet kit (Dynojet) and it recommend a #146????

From reading the forums it seems like most people uses a #170.

I have serious "backfire" when I decelerate. Any thoughts?

Thanks in advance!

Fred

You are probably lean with the 162 given that it's popping on decel, if you do all the free mods check out the jetting charts in the technical forums... for my elevation and average temp I installed a 172.... the GYTR AIS kit said to install the provided 175 but I thought that might be a little rich... I am in no way a jetting guru and with the 07' it's not exactly convenient to go on a jetting analysis thru process of elimination:banghead: I live in WA state, average year round temps are 55 - 65 deg and I ride anywhere from 500' - 5000' feet.

Good Luck:ride:

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