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Winter jetting
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Posted by: jason.bolan

What do i need to do for a stock 07 YFZ as far as jetting so that i can ride in the winter. MN winter. usually colder.

Posted by: TWILES

Here's what I've got in my 05 WR450 and the heads and carbs are identical as far as I know.

Stock 05 YZ450F needle
48 pilot jet
170 main
fuel screw out 1 3/4 turns

I know the YFZ jetting is a lot different from that but you might try it. If you have a pipe/bafffle out of the stock muffler and the airbox opened up a little it will be close. My WR runs good off that just about all the time. That will probably cost you $25